Advantages in the studies of composite nanomaterials based on the polyvinylidene fluoride (PVDF) ferroelectrics with graphene/graphene oxide (G/GO) are presented. The computer simulation of nanocomposites PVDF-G/GO were studied by the different methods using the HyperChem software package: molecular mechanics, quantum mechanics using the semi-empirical PM3 and molecular dynamics (MD) runs. The experimental results correlate qualitatively with the results obtained in these calculations. The calculated data of the piezoelectric coefficients d33 ~ 12 - 30 pm/C for PVDF-G/GO models corresponding to their observed behavior in comparison with experimental data of the piezo-response force microscopy. Using MD run with PM3 method, calculations of the polarization with increasing temperature were carried out. On the basis of this data, the pyroelectric coefficients were calculated, which were in agreement with the known values for the pure PVDF ~ 40 μC/(m2*K). For composite models with G/GO it turned out that in the case of a single-layer model the pyroelectric coefficients increased by 3-4 times, and for the case of a two-layer sandwich model it were decreased by 2-3 times in comparison with pure PVDF model. Value ~ 18 – 60 μC/(m2*K) were obtained for various compositions and are in line with recent experimental data ~ 33 μC/(m2*K)). The obtained results give important information about the mechanisms of piezoelectricity and pyroelectricity in such nanocomposites, open new perspectives for further development and applications of these new nanocomposites. Authors are thankful to the Russian Science Foundation grant # 16-19-10112 and Russian Foundation for Basic Researches grants # 16-51-53917 for support
Vladimir Sergeevich BYSTROV – PhD, Dr. Habil. Phys. (University of Latvia, Riga), Dr.Sci. Phys.&Math. (Russian Academy of Sciences) since 1993 – has expertise in various fields of the Computational Molecular Modeling and Material Sciences: ferroelectrics polymer PVDF/PVDF-TrFE thin films, graphene/oxide graphene and composite nanomaterials; amino-acids nanocrystals, peptides nanotubes, hydroxyapatite, etc. Computational studies of nanostructures were made using various methods (ab initio, DFT, semi-empirical methods, molecular mechanics), molecular dynamics on the base of HyperChem, AIMPRO, VASP, etc. He is Head of Group for Computer Modeling of Nanostructures and Biosystems of IMPB-KIAM RAS.
Graphene oxide-GO and Carbon natotubes-CNTs are new kind of carbon materials that offer interesting possibilities as catalysts and photocatalysts support for CO2 and biomass conversion. Popped graphene oxide (PGO) and PGO loaded with copper(II)oxide behave as photocatalysts for the carboxylation of C-H bonds. Both enable the carboxylation of acetylacetone affording two isomeric carboxylic acids, as a result of CO2 coupling to organic radicals formed upon oxidation by photogenerated holes. The reaction is very selective and side products are not formed. Both PGO and CuO@PGO do not have the correct potential for generating CO2•–: therefore, the reaction mechanism of formation of the carboxylates cannot be the same demonstrated in our previous studies for Ru@ZnS [ChemPlusChem, 2014, 79, 708-715; Faraday Discuss., 2015, 183, 413-427], which promoted the formation of CO2.- and the subsequent formation of C-C bond via radical coupling. M@CNT are active in a wide range of biomass conversions. Au or Pd nanoparticles deposited on CNTs have high catalytic activity for the base-free aerobic oxidation of 5-HMF towards FDCA. We have studied the use of M@CNTs (M=Fe, V), or M@NCNTs (NCNT is a nitrogen-doped CNT) for the aerobic oxidation of 5-HMF, fructose, glucose or even sucrose in water. We have shown that the oxidative cleavage of the C6 polyol takes place to afford interesting yields of oxalic acid and succinic acid as co-product. To the best of our knowledge, this is the first report of a sustainable synthesis of OA from a C6 polyol with a best potential yield of approximately 60% under quite mild conditions
M. Aresta. Doctor Industrial Chemistry, University of Milan; PhD Engineering HC, University of Bath, Bath, UK; Honorary Pofessor University of Tianjin, Tianjin, China; Honorary Chair of the International Conference on Carbon Dioxide Utilization-ICCDU. Founder and CEO of the Start-up Innovative Catalysis for Carbon Recycling-IC2R srl. Chair of the Scientific Council of the Interuniversity Consortium on Chemical Reactivity and Catalysis-CIRCC.
A rational and multicomponent design of hierarchical CoFe2Se4 (CFS) nanorods adhered to CoNiSe2 (CNS) microsphere composites is prepared for the first time via facile and eco-friendly synthesis methods. The hierarchical CFS-CNS robust architectures enhance the specific surface area and porosity and also increase the availability of electrochemically active sites, which provides ideal pathways for electrolyte diffusion and facilitates electron transportation. As a result, the as-prepared fabric-based CFS-CNS electrode delivers a maximum specific capacity of 183.4 mAh/g at a current density of 1 A/g, with an excellent rate capability of 172.4 mAh/g at 8 A/g and outstanding cycling stability with 99.2% retention over 3000 cycles in aqueous 3 M KOH electrolyte solution. Moreover, the assembled fabric-based CFS-CNS//CFS-CNS symmetric SC achieves a high energy density of 80.2 Wh/kg at 1000 W/kg and delivers an exceptional cycling stability with 97.02% retention over 3000 cycles as well as exhibiting excellent flexibility to sustain various deformations including bending and twisting. In addition, cubic manganese diselenide (MnSe2) and hybrid reduced graphene oxide/MnSe2 (G-MnSe2) materials were synthesized by a facile hydrothermal method. Surprisingly, the final G-MnSe2 product contained a negligible amount of selenium impurity. The MnSe2 and GMnSe2 hybrid materials were characterized in detail. For the first time, the electrochemical energy-storage behavior of MnSe2-based materials was assessed for supercapacitor applications. The specific capacitance of the MnSe2 electrode was approximately 57.8 mF/cm2, whereas the hybrid G-MnSe2 electrode showed a much higher specific capacitance of 93.3 mF/cm2 at a scan rate of 1 mV/s. A symmetric cell made from the G-MnSe2 hybrid material showed excellent long-term stability for 4500 cycles and approximately 106% retention of its initial capacitance, which is impressive compared with the cycle life of the MnSe2-based symmetric cell (80% capacitance retention at the 4500 cycles).
Prof. Hee-Je Kim got PhD of Energy Conversion, Kyushu University, Fukuoka city, Japan. (1990, March) At present he is professor of Department of Electrical Engineering in Pusan National University (Busan, South Korea). And the group leader of BRL (Basic Research Lab.). He is currently working as an Associate Editor of NJC (New Journal of Chemistry)-RSC shared and Editorial Board Member of Journal [Energies].
In this talk we will review recent progress on nanoengineering of inorganic and carbon nanomaterials for tailored applications. Special emphasis is paid in the group to exploit the synergies of both types of materials by the preparation of nanohybrids with novel or enhanced properties. We will focus on the development of nanomaterials for application in the biomedical field and on the isolation and template assisted-growth of rolled-up single-layered 2D materials. Among the different types of carbon nanomaterials, one advantage of using nanotubes is that their inner cavity can be filled with a chosen payload while the outer surface can be modified with selected moietes. The encapsulation of materials allows ultrasensitive imaging and even mapping of subcellular organelles, whereas functionalization of the external walls of these filled carbon nanotubes (CNTs) allows targeting of cancer cells. The formation of such hybrid systems is not limited to the biomedical field. A large deal of attention is being devoted towards the isolation and growth of single layers of a wide variety of inorganic materials which is of interest for both fundamental research and advanced applications. We have reported on a versatile approach that allows the formation of single-layered inorganic nanotubes within the cavities of carbon nanotubes thus leading to van der Waals heterostructures
Gerard Tobias obtained the degree in Chemistry (with Honours) from the Autonomous University of Barcelona (2000), Master in Materials Science and Ph.D. with European mention (UAB, ICMAB, 2004). He was a research visitor at Ames Laboratory (USA) and EMAT (Belgium). Between 2004-2009 he was at Oxford University (UK). Since 2009 he leads research on "Nanoengineering of Carbon and Inorganic Materials" at the Materials Science Institute of Barcelona (ICMAB-CSIC). Dr. Tobias has coordinated the FP7 European network RADDEL and has been recently granted an ERC Consolidator Grant (NEST, 725743).
Over the past two decades, researches on low-dimensional carbon nanostructured materials (SWCNT and graphene) designed for a variety of sensor applications have made remarkable progress. However scalable fabrication and engineering of high performance sensors that harness 2-3 dimensional nano/micro architectures of these nanomaterials have remained largely elusive. Such methodologies will allow unprecedented device architectures fully utilizing superior physical and chemical properties of these nanomaterials for high performance and low SWaP sensors. Here we present some of our progresses in assembly and engineering of singlewalled nanotube networks and building 2-3D architectures for broad ranges of high performance chemical, optical and ion sensors by combining state-of-the-art assembly and transfer based nanomanufacturing strategies developed in our laboratory
Professor Yung Joon Jung received his Ph.D. in MSE, RPI in 2003. He worked as Postdoctoral Fellow at Rensselaer from 2003-2005, and joined Northeastern at 2005, working in Department of Mechanical and Industrial Engineering. His research focuses on investigating new synthetic routes for 1-2D nanomaterials and engineering their molecular structures. His group develops nanomanufacturing processes for chemical, ion & radiation sensors and energy storage applications supported by NSF, Materials Genome Initiative (DMREF), US Army, Republic of Korea etc. He is also co-faculty director at Kostas Advanced Nano-characterization Center at Kostas Homeland Security Institute. He published over 60 articles in journals.
By the 'Feynman - Kac formula, a solution to the Schroedinger wave equation can be represented in terms of the Wiener process, its mathematical prominence in diverse fields comprising; ‘control theory and the mathematical theory of stochastics’ based applications cannot be undermined. It is known that light, or photon traverses via a random path in a material medium, based on the Feynman-kac formula, an integral path derivation has been made and proposed. A numerical experiment has been done in our previous investigation and presented for the trajectory and fluence calculation of photon in an anisotropic biological medium based on the selected optical constants. We have extended our results from numerical experimentation by including extended version ‘Monte Carlo’ random based generated results based on the selected salient factors & optical parameters
Adewole O has vast & strong expertise in numerical and computational methods, models, he also has strong and intense passion for material science, biochemical engineering, systems biology and imaging. He has wide and broad research experiences covering computational and numerical methods, models, stochastics and economics, Literature Arts, material sciences and quantum mechanics. He is currently the founder, manager and overseer of “Campagna Global Literary Edifice”, which was fully incorporated in Lagos in March, 2017. Other recent research areas include a task to unravel more frontiers in the field of ‘bio-ethanol, fermentation & chemical processing’ and develop numerical based results in this filed in the nearer future. More results would be made available in this field in upcoming events and the nearest future.
In the present report we consider the properties of fluorinated graphene (FG) created with the use of a technologically simple and cheap fluorination approach based on the treatment in an aqueous solution of hydrofluoric acid. FG films can be formed from a CVD grown graphene or few layer graphene, mechanically exfoliated graphene and graphene suspension. A possibility to control a fluorination degree was demonstrated. The FG films with arrays of graphene quantum dots (GQDs) embedded in a fluorinated matrix are found to create for case of the weak fluorination degree (F/C<30%). These films with GQDs are promising for flash memory applications, for field effect transistors to provide a strong current modulation by gate voltage, for logic devices due to possibility to have current voltage characteristics with negative differential resistance and so on. A stable resistive switching effect is detected in films created from the FG suspension. An excellent insulated properties of fluorinated graphene with F/C>30% (the ultra low charge values, low leakage current, stability) are demonstrated. Suspensions of fluorinated graphene with nanometer size flakes are of interest for the development of 2D printing technologies. Promising mechanical properties of FG for flexible and transparent electronics are demonstrated . Functional properties of van der Waals and 2D printed graphene / FG heterostructures are also discussed in the report.
Prof. Dr Irina V. Antonova graduated from the Novosibirsk State Technical University (Department of Physics and Engineering) in 1979. Since 1981 she has been working at the Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Science. Presently, I.V. Antonova occupies a leading researcher position at the Laboratory of Three-Dimensional Nanostructures, ISP SB RAS. I.V. Antonova received her Ph. D. in semiconductor physics in 1990 for the investigation of inhomogeneous distributions of defects and impurities in silicon. In 2009, I.V. Antonova successfully defended her doctoral dissertation. Her activity was connected with transport and recharging phenomena in nanocomposite layers (Si, Ge nanocrystals in dielectric matrix), and localized states in heterostructures and at interfaces (silicon-on-insulator, SiGe quantum wells and quantum dots), high-pressure-related effects, surface passivation phenomena. Nowadays I.V. Antonova heads a group of researchers dedicated to investigation of graphene and its derivatives. The scope of current research and professional activities of Prof. Dr I.V. Antonova include chemical functionalization of graphene, fabrication of graphene / fluorographene heterostructures and arrays of graphene quantum dots embedded in a fluorographene matrix, 2D printed technologies with graphene based materials, study of transport and recharging phenomena in nanocomposite layers and localized states in heterostructures,. Presently, Prof. Dr Irina V. Antonova has above 280 papers. Sum of the times cited is above 1000, h-index is equal to 14.
Graphene is a crystalline allotrope of carbon with 2-dimensional properties. Its carbon atoms are densely packed in a regular atomic-scale chicken wire (hexagonal) pattern. It is a single atomic plane of graphite, and is sufficiently isolated from its environment to be considered free-standing. Each atom has four bonds: one σ bond with each of its three neighbors and one π-bond that is oriented out of plane. The atoms are about 1.42 Å apart. Graphene's hexagonal lattice can be regarded as two interleaving triangular lattices. This perspective was successfully used to calculate the band structure for a single graphite layer using a tight-binding approximation. Graphene technology is showed the Graphene sandwich Cap construction which developed with the most sophisticated material known to man. It has a balanced mix of light Graphene and extra titanal layers and combines the most extreme agility with extreme responsiveness for an ultimate performance. Sandwich Cap Construction has had a reduction in the materials inserted with an increase in its responsiveness, allowing faster and more precise change from edge to edge.
Professor Zizi Abdeen is an Egyptian national. She is a researcher Professor in polymer lab. Petrochemicals dep., Egyptian Petroleum Research Institute. She completed her PhD & M.Sc. degrees in Polymer Chemistry from Ain Shams University, (Egypt), where she also completed her B.Sc., Degree in Chemistry, Faculty of Sciences, Cairo University, (Egypt). She main stream research is at the frontier of materials/polymer science and emerging fields such as nanotechnology/nanocomposites. She has a keen interest in the development of intelligent materials based on bio resources such as chitosan and starch through chemical modification and advanced biotechnology processes. She is author of over 33 articles on polymers, biomaterials, hydrogels and nano composites systems and reviewer of over 30 International journals and a member of the Advisory Editorial Board of Polymers and Biomaterials in different International journals. She was sharing as technical committee in more than ten international conferences.
Direct and large-scale graphene synthesis on flexible substrates is challenging approach to manufacturing flexible electronic devices, as it avoids the drawbacks of transferred graphene. To fabricate flexible devices on plastic substrates, the graphene synthesis temperature must be below ~150 °C to prevent substrate deformation. High-quality graphene was directly synthesized on 10 nm-thick Ti-buffered polyethylene terephthalate (PET) substrates. Herein, we demonstrate theoretical and experimental evidence for 4-inch-scale, high-quality graphene grown at low temperatures below 150 °C via plasma-assisted thermal chemical vapor deposition (PATCVD) that reduces a CH4 into carbon at room temperature. The monolayer graphene synthesized directly with no transfer revealed the surprising results such as predominant electromechanical properties, a low sheet resistance of 81 4.0 □-1, a giant average grain size of ~ 130 m, a high field-effect-transistor (FET) mobility of (8.4 0.03) 103 cm2 V-1s-1, a Dirac point of around ~ 0 V, and room temperature on/off current ratio of ~ 103 in monolayer graphene-FET. We further use layer-by-layer direct stacking to fabricate three-layers for lower sheet resistance, which showed values as low as ~ 10 □-1 at ~ 93% transparency. Graphene films of three layers stacked directly revealed a predominant flexibility by 104 bending cycles under tensile strain of 5%. These findings could pave the way for a practical exploitation of flexible electronic devices via large-scale, high-quality monolayer graphene synthesized directly with no need for transfer processes.
Prof. Soon-Gil Yoon received his Ph.D. from the Korea Advanced Institute of Science and Technology (KAIST), Korea in 1988. He is a professor in Department of Materials Science and Engineering, Chungnam National University, Republic of Korea. His current research interests are Thin film capacitor, Fusion technology of Solar cell, Thermoelectric, and Piezoelectric using one material and one structure, In situ graphene growth with no transfer at 150 oC, Flexoelectric properties using Zn-Al:LDH nanosheets. Perovskite dye thin films such as MAPbI3, MASnI3, and MAPbCl3, etc by CVD. He had published SCI papers of about 330 including Nano Letters, Advanced Materials, ACS Nano, Nano Energy, J. Mater. Chem. A, and Scientific Reports
Soybean oil as a carbon source was recently used to replace methane to produce large area graphene through the chemical vapor deposition (CVD) method at low temperature (800 °C). The as-grown graphene is a two-dimensional carbon atom lattice in hexagonal orientation (0.355 nm thickness) with ~97% optical transparency and ~300 Ω electrical sheet resistance. In this study, an ultrasensitive Fe-C coated long period fiber gratings (LPFG) corrosion sensor was designed and tested using graphene (Gr) as a transparent conductive film for Fe-C electroplating. Monolayer graphene was produced on copper foil by the decomposition process of soybean oil through CVD. Three layers of graphene were stacked, wet transferred and adhered on the curved LPFG surface via pressurized adhesion. For comparison, another reference sensor was prepared using silver nano ink as the conductive film. Both sensors were tested for 72 hours in 3.5 wt.% NaCl solution with simultaneous measurements of transmission spectrum and electrochemical impedance spectroscopy. Due to the high optical transparency, the graphene-based sensor increased the wavelength sensitivity and overall service life by over 90% and 110%, respectively. The proposed sensor utilized low cost soybean oil and optic fiber to fabricate high sensitivity and long service life corrosion sensor. Similar procedures can be used to assemble other types of sensors in different applications
Dr. Genda Chen is Professor and Abbett Distinguished Chair in Civil Engineering and Director of INSPIRE University Transportation Center at Missouri S&T. He received his Ph.D. degree from the University at Buffalo in 1992 and joined Missouri S&T in 1996 after three years of consulting practices. He was granted 3 patents and authored over 350 publications in structural health monitoring, smart structures, interface mechanics and deterioration, and multi-hazard engineering. He is Section Editor of “Intelligent Sensors” and Associate Editor of the “Journal of Civil Structural Health Monitoring.” He was elected to be American Society of Civil Engineers Fellow in 2007
Carbon nanotube-based structures attract as much interest as the carbon nanotubes (CNT) proper although the former are more difficult for manufacture and study. There are many works devoted to filled CNT [1-3]. For instance, metal-filled nanostructures are proposed for use in mechanotronics, photothermal elements, etc [1,2,3]. It is also worth mentioning heterojunctions in such structures and theoretical possibility of soldering nanotubes to each other. Unfortunately, the further advancement of such applications is hindered by limitations in the length of the metal inclusions in the nanotube, which never exceed several tens of nanometeres. We report the synthesis of metal-filled CNT characterized by astonishingly high length of the metal kernel i.e. up to hundreds of micrometers. The Ni-filled nanotubes were produced by CVD method using a mixture of ferrocene and nickelocene as a catalyst precursor. A diffraction study of the metallic kernels has proved that they are single crystal. The inclusion is a single Ni monocrystal of appr. 2 nm diameter and up to 100,000 nm length Thus, our results paved the way to the development of a novel class of carbon-based nanomaterials, which can also provide ideal platforms for innovative applications. 1. Metal-Filled Carbon Nanotubes as a Novel Class of Photothermal Nanomaterials// F.Rossella Et al., Advanced Materials, 24(18), 2453–2458 (2012) 2. Nanostructured magnetic metamaterials based on metal-filled carbon nanotubes// F.Rossella Et al., Carbon, 96, 720–728, (2016). 3. Bending of metal-filled carbon nanotube under electron beam irradiation// A.Misra, AIP Advances, 2(1), 012142 (2012).
S.A.Urvanov has completed his PhD from Moscow state University, Russia. He is the research scientist of Technological Institute for Superhard and Novel Carbon Materials, a premier Russian organization in development of carbon materials. He has published more than 7 papers in reputed journals
Graphene and graphene related materials (GRM) are heralded as 'miracle' materials with manifold applications in different fields from electronics to composites to medicine. Since the Nobel Prize award in 2010, graphene has attracted an increasing and widespread interest seen in the exponentially growing number of publications or patents. However, to realize such potenitals, the health and environmental impact of the graphene and GRM should be thoroughly evaluated in order to avoid socio and economic drawbacks. In this talk recent in vitro data on GRM – lung and GRM – gastrointestianl interactions representing two major exposure routes will be discussed. It will highlight the importance of material characterization, since GRM is not GRM, the suspension quality, dosing as well as it will focus on some mechanistic insights elaborated within the Flagship Graphene Project. These studies among others will help to disentangle the structure-activity relationships for this class of materials, needed for safer-by desgin development, grouping or regulatory purposes
Peter Wick studied and received his PhD in cell- and molecular biology at the University in Fribourg (Switzerland). Thereafter (2002) he moved to Empa and began his research in nanosafety. Since 2010 he heads the research laboratory for Particles-Biology Interactions, has over 100 peer-reviewed publications in reputed journals, is member of the advisory board of the Swiss Action Plan on Nanomaterials as well as Associated Editor of NanoImpact and coordinates the Swiss Contact Point for safe handling, regulation and transfer of nanomaterials.
During the past few decades, significant increases in the efficiency of Nanomaterials materials have attracted widespread research interest in the development of potential applications for new Detector and Sensor technology in immaging, sensing and telecommuncation areas. Infrared sensing devices rely on narrow band gap semiconductors grown by expensive and complicated procedures. Among the possible materials that may cover the mid-infrared as Collodial Quantum Dot´s, some Nanomaterials, in principle, cover the full range by simply tuning the size. On the other hand, in the development of next-generation materials with enhanced Infrared Detection properties, biological systems in nature provide many examples that have exceptional Nanostructural designs and unparalleled performance in their Infrared sensing functions. Hierarchical nanostructured surfaces with photonic crystals, inspired by Nature is shown to facilitate the selective modification of such a structure, which results in a very high sensitive infrared response. These findings offer a new path both for detecting infrared photons and for generating nanostructured bimaterial systems for high-performance sensing platforms. Quantonics Crystals will develop in cooporation these structures and Photonic Crystals
Michael Schmidt has completed his PhD from Johann-Wolfgang Goethe University, Frankfurt / Germany and University of Arlington Texas, USA. He is the CEO and founder of Quantonics Crystals, a supplier and development company of Nanomaterials and organic semiconductors.
Nanocomposites have become more and more important as the implementation of nanoparticles in polymer allows additional functions in common industrial parts. Especially in the fabrication of filaments or fibres nanomodification is important, as only very small fillers can be added to the very fine fibres (common fibre diameter is 20 µm, fine filaments are 1 µm). It is important that the particle dimension does not exceed the fibre diameter, otherwise fibre manufacturing becomes impossible. [1,2] Though, the quality of functionalized compounds for the melt spinning process lacks appropriate homogenity for a continous spinning process at equal paramters. Furthermore, the particles tend to reagglomerate or aggregate in the melt due to the temperature exposure in the process. Therefore a device is needed that allows to destroy agglomerates and aggegated, either arising from the compounding or from reagglomeration. In this study, an ultrasonic device is designed, manufactured, implemented and tested for functionalized melts. The material composition is 0,1 wt% Graphen (avanGRP by avanzare, La Rioja, Spain) in polyamide 6 (B24 N03 by BASF SE, Ludwigshafen, Germany). In the presentation it is shown that sonication can drasticly decrease the filter pressure which is an indication for higher homogenity of the particles in the melt. Furthermore, influences on the fiber formation process by the sonication device are shown. In the end an overview of further fields of application is given
Merle Orth has completed her M.Sc. at RWTH Aachen University, Germany and performs her PhD studies at Institut für Textiltechnik of RWTH Aachen University, Germany. She develops new devices to improve the melt spinning process.
Recently, increasing attention has been paid to the resistive memory, presenting a type of nonvolatile memory featuring rather a simple memory-cell design (with a resistor), short data rewrite times, low write voltages (1 – 3V), design scalability and longer data retention times. The current-voltage characteristics for fluorinated graphene (FG) films were found to demonstrate resistive switching. The advantage of resistive memory based on fluorinated graphene films are the material stability and ability to create films on solid and flexible substrates at room temperature. In the present study, we investigated the resistive switching phenomenon observed in the composite structures based on fluorinated graphene (FG) with nanoparticles of VOx (mainly V2O5). To create crossbar structures Ag/FG:VOx/Ag by 2D inject printing, the composite suspensions containing FG flakes and nanoparticles of V2O5 with variable content are analyzed. The stable resistive switching effect up to six-eight orders of magnitude is observed for this printed structures. The maximum ON/OFF relation was observed for a composite film thickness of about 40-60 nm. The voltage pulse measurements demonstrate a stable resistive switching for the pulse duration ranged from 1 μs to 10 μs at which the structures change their conductivity from high- to low-resistance states. The obtained structures are of interest for the non-volatile memory cell fabrication in the field of flexible and printed electronics.
Artem I. Ivanov graduated from the Novosibirsk State Techniсal University (Master of Engineering and Technology), Russia, and nowadays he is a postgraduate student of A.V. Rzhanov Institute of Semiconductor Physics, Russian Academy of Sciences, Russia. Currently, Artem studies the properties of functionalized graphene-based materials including fluorinated graphene, layered and composite films of these materials and the resistive switching effect for the use in printed technologies and flexible electronics He has published 5 papers in reputed journals and took part in 7 international and Russian conferences
Solar and wind based renewable energy supply will increase by more than one decade in twenty years  and such growth of intermittent renewabe enerygy requires implementation of energy storage technologies. Electrochemical water splitting in a membrane electrolysis cell is a promising technology for converting excess electrical energy into chemical bond energy, namely hydrogen bond energy. In electrolysis cells, water splits to its atomic constituets at scarce platinum group metal (PGM) based electrocatlaysts. Produced hydrogen can serve as an energy carrier and connect energy sector to chemical industry and transportation sectors. Hydrogen electrode processeses contribute to degradation phenomena and consequently, affect the durability of the device. Moreover, the known PGM reserves cannot cover the foreseen need. Hence, developing earth-abundant element based durable electrocatalyst is essential. Carbon nanotubes (CNTs) have several beneficial properties needed for electrocatalyzing: high conductivity, good stability and appropriate morphology for 3D electrodes. CNTs can function as support for ultra-low-Pt electrocatalysts , or as a scaffold for synthetizing hybrid electrocatalyst materials comprising of earth-abundant elements. The latter include doped CNTs  as well as transition metal nanoparticles encapsulated in few carbon layers on CNT supports . These materials have inherently different activities towards hydrogen evolution, but their activity can be also affected by selected synthesis method and starting materials. The most active hybrid materials show similar activity to the commercial Pt/C catalyst and excellent durability. In this presentation, CNT based electrocatalysts promoting hydrogen evolution are introduced and their properties are discussed. These materials will promote implementation of durable and high-performing electrolyzers
Tanja Kallio is professor in Aalto University and she develops ecological, safe and affordable materials for batteries and electrocatalysts. she always been interested in raw materials and their characteristics from the school of chemical technology. Ms Kallio and her research group search for materials that could improve the functioning, safety and eco-friendliness of lithium -ion batteries and electrocatalysts. Batteries are a part of most everyone's daily lives - they are found e.g. in mobile devices. Electrocatalysts, on the other hand, are needed for storage of electricity e.g. when using renewable energy.
The design and optimization of 3D graphene nanostructures are critically important since the properties of electrochemical energy storages such as secondary battery and supercapacitor can be dramatically enhanced by tunable porous channels. In this work, we have developed porous graphene aerogels from graphene suspensions obtained via electrochemical exfoliation and explored their application as energy device electrodes. By adjusting the content of the electrolyte in the exfoliation process, the aspect ratio of graphene sheets and the porosity of the graphene network can be optimized. Furthermore, the freezing temperature in the freeze drying step is also found to play a critical role in the resulting pore size distributions of the porous networks. The optimized conditions lead to meso- and macroporous graphene aerogels with a high specific surface area, extremely low densities and superior electrical properties. As a result, the graphene aerogel devices exhibit high electrochemical stability and electrode uniformity required for practical usage. This research provides a practical method for lightweight, high-performance and low-cost materials in the effective use of energy storage systems.
Dr. Hyunyoung Jung is now an assistant professor in the Department of Energy Engineering at the Gyeongnam National University of Science and Technology. His ongoing researches focus on energy conversion and storage devices of engineered nanomaterials and composites, aerogel for energy and environment, and optoelectronics. He has worked as a Research Associate from 2010 to 2015 in the Department of Mechanical and Industrial Engineering at the Northeastern University. Prior to this, He worked as a Research Associate in the Department of Materials Science and Engineering at the Carnegie Mellon University in 2009. He completed his Ph.D. in the Department of Chemistry from Seoul National University in 2008.
The last few years have witnessed the development and large-scale manufacturing and production of novel CNT and graphene based nanocomposites for energy and biological related applications. These remarkable arrays of features have potential applications as biomedical materials and devices, biosensors, drug and vaccine delivery vehicles and novel biomaterials. In addition, they promise a wide range of energy applications such as catalyst supports in fuel cells, Li ion battery, gas sensors, gas-storage media, supercapacitors, nanolubricants, and nanofluids. It is suggested that in this scenario of diminishing fossil fuels, solid-state hydrogen-fuel cell can be the future energy resource in hydrogen economy. Proton exchange membrane fuel cells (PEMFC), run by hydrogen stored in hydrogen storage device, have been considered as the future energy converting devices because of its low emission, portability, high operating voltage, quick startup and high efficiency. In Li-ion battery, there is a need to increase the rate capability and bringing a synergy between CNT and reduced graphene oxide can enhance rate capability. Besides, in the lubrication of the industry components, nanolubricants can provide better lubrication effects due to the considerable decrease in the friction and temperature, which depends on the base oil and the carbon nanomaterials used. The present talk offers a concise and focused review of the state-of-the-art in the synthesis and clean energy generation and storage applications of carbon nanotubes and reduced graphene oxide composites.
Prof. Ramaprabhu has completed his PhD from Indian Institute of Technology Madras, India. He received Alexander Von Humboldt-Stiftung, DAAD fellowships and worked in Darmstadt, Germany. Further he has done a postdoctoral study in University of Geneva, Switzerland. He is at present Institute Chair Professor of Physics Department, IITM, Chennai, India. He has published more than 335 papers in reputed journals and has been serving as an editorial board member of reputed international journals. He has 45 international/Indian patents
This research introduces a radically unconventional, voltage-tunable, sharply non-linear and extremely sensitive photo-response in fludically-assembled SWNT/Si heterojunctions, with high photocurrent responsivity, high photovoltage responsivity, high electrical ON/OFF ratios and optical ON/OFF ratios. Photonics which is the scientific study and application of light has evolved to become a key technology behind many devices found in the modern home, factory and research lab. Our researches show that CNT–silicon junctions form a versatile platform for optoelectronic applications ranging from photodetection, photometry and imaging. The voltage-switchable photocurrents with high switching ratios allow one to conceive mixed optoelectronic logic elements and voltage-triggered digital optoelectronic operations and digital-to-analog conversions. The on-chip architectures are scalable and completely compatible with conventional microelectronics technologies, including the possible inclusion of waveguides and other photonic components.
Young Lae Kim has completed his PhD from Northeastern University, USA and worked in PTD research group at Intel Corporation, USA. He is assistant Professor at Gangneung-Wonju National University, South Korea. He has published more than 15 papers in reputed journals
Carbon nanotubes exhibit outstanding properties, which, alas, are difficult to translate into macro scale. Two necessary conditions for successful translation are as follows: (1) the nanotubes must be aligned; (2) the nanotube length must be comparable with dimensions of a macro-sample or device. This work presents the results of the applied research comprising a synthesis way for such centimeter-long aligned nanotubes; scale-up of the production process through growth, pulling of the nanotubes into big spools; and processing. The macroscopic material requires the nanotubes in quantities, which are difficult or impossible to produce in laboratory bench scale. So it is necessary to scale up, which is a difficult chemical engineering problem. A suspended-bed synthesis rig is reported capable of producing at 1200°C carbon nanotubes, which are aligned due to in-process pulling, in spools in kilogram amounts. The core of the reactor block is a 324 mm diameter reactor made of high-temperature steel and clad with quartz. The aligned carbon nanotubes were investigated by electron microscopy (SEM/TEM), Raman spectroscopy, thermal analysis and XPS. It was shown that the material is dominated by aligned double-walled nanotubes. Investigation of electrochemical properties showed an unprecedented robustness to voltammetry cycling in alkali solutions and very fast charge-discharge. The capacity exceeded 27 F/g. The rolled carbon nanotubes and nanotube-reinforced polymers in the form of thin tapes or fiber or bulky composites demonstrate dramatic and anisotropic boost of mechanical and electrical properties such as jump of strength of a polyurethane tape from 18 MPa up to 500 MPa.
Vladimir Mordkovich has completed his PhD from Moscow State University, Russia and then Dr.Sci. from Institute for Materials Science Problems, Ukraine. He spent 11 years in Japan as a senior researcher in governmental and corporate projects and then returned to Russia to become a head of a New Chemical Technologies and Nanomaterials department at Technological Institute for Superhard and Novel Carbon Materials and also a CTO of INFRA Technology Ltd., an international technology company in gas-to-liquid and gas-to-solid technologies. He has published more than 150 papers in reputed journals and authored 52 patents.
Inorganic-organic hybrids modifiers have attracted attention of scholars worldwide because they combine the advantages of both different components and provide a way for modifying the structure and properties of polymeric materials. The presentation described and investigated a positive effect of reduced flammability of thermoset resins thanks to the use of nanocomposites containing new inorganic-organic hybrid flame retardants(FR) which combine conventional phosphorous/nitrogen modifiers interacting with nanocompounds. The impact of these inhibitors on the level of flammability of thermoset resin compositions was defined by determining the value of limiting oxygen index (LOI), thermogravimetric(TGA) and cone calorimeter(CC) analysis of thermal destruction processes. Morphology of composites was assessed by a scanning microscope and analysis of actual SEM micrographic images. The analysis of thermal decomposition of the materials under examination confirmed flammability reducing properties of the inorganic-organic hybrid FR used, and a synergist to generate integrated flame retarding effect was observed between conventional modifiers and nanofillers, in particular carbon nanofillers: expandable graphite, graphene and graphene oxide. The inorganic-organic hybrid FR will provide a new solution to efficient flame retardant polymeric materials.
Professor Ewa Kicko-Walczak graduated from Polytechnic University in Warsaw, Chemical Faculty (Technology and Modification of Polymer Materials). In 1979 started working in Industrial Chemistry Research Institute ( ICHRI) in Warsaw. Since 1984 Prof.Ewa Kicko-Walczak-Head of Laboratory of Thermoset Resins in above Institute. In 1985 receipt of Doctor Technical Science title from Institute ICHRI ( with special distinguish) and in 2012 she received a D.SC.in technology chemistry from Engineering and Technology Chemistry Faculty of Cracow University of Technology. She completed International Centre of Physics and Chemistry in Ferrara, Naples and Roma (Italy) and International Professional Course for Managers of Chemical and Pharmaceutical Industry in Copenhagen (Denmark) –Washington US. Since 2010 Prof. Ewa Kicko-Walczak started to cooperate with the Institute for Engineering of Polymers Materials and Dyes. Prof. Ewa Kicko-Walczak is the author ( co-author) more than 82 original research publications, author 6 polymeric monograph, and author more than 90 scientific presentations on international Conferences and Congress. She is author or co-author 65 patents/patents application. She is also coordinated polish and international 25 research projects oriented towards new polymer materials.
The capability of radio frequency (RF) inductively coupled thermal plasma (ICP) in producing wide varieties of high purity ultra-fine nanoparticles has been established. Furthermore, RF ICP system has been utilized for graphene nano-flakes (GNF) synthesis by injecting CH4 precursor into the Ar/H2 mixture plasma. Numerical simulation based on fundamental theory and computational fluid dynamics (CFD) has been made to understand the growth process of GNF. However, in-situ investigation of induction plasma to study chemical kinetics of precursor dissociation has not been discussed in detail. We have probed Ar/H2/CH4 and Ar/H2/C2H2 induction plasma systematically by optical emission spectroscopy (OES) at different process conditions during GNF production. Emission from C2 Swan system, CH and C3 radicals are observed in optical emission spectra of both Ar/H2/CH4 and Ar/H2/C2H2 plasma which indicates the similar pathways for both CH4 and C2H2 dissociation. The preexisting electrons, atomic hydrogens and excited state argon atoms (Ar*) in Ar/H2 plasma leads to the dissociation through electron impact and dehydrogenation processes, and the energy transfer from Ar* to resulted hydrocarbons containing C2 and less number of hydrogen such as C2H2 and/or C2H produces C2 species. The condensation of C2 species ensues formation of GNF through homogenoeus nucleation at appropriate growth conditions where condensation rate sufficiently exceeds the evaporation rate that causes higher supersaturation and formation of stable particles. The C2 temperature is more for C2H2 than CH4 under the same condition which is consistent with less production for C2H2 than CH4. Maximum production rate achieved for CH4 is 10 g/h.
Dr. Antaryami Mohanta has completed his PhD from Indian Institute of Technology Kanpur, INDIA and postdoctoral studies from National Sun Yat-sen University, Taiwan, The University of Alabama, USA and Purdue University, USA. He has also worked as Postgraduate Research Program Participant at U.S. Army Aviation and Missile Research, Development and Engineering Center (AMRDEC), Redstone Arsenal, AL, USA. He has published more than 23 papers in reputed journals and has currently been working as scientist at EMPA–Swiss Federal Laboratories for Materials Science and Technology, Thun, Switzerland
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Prof. Gianaurelio Cuniberti holds since 2007 the Chair of Materials Science and Nanotechnology at the Dresden University of Technology. He leads the Nanobiomaterials Department of the Max Bergmann Center of Biomaterials Dresden and is the founding director of the Dresden Center for Computational Materials Science (DCCMS). He studied Physics at the University of Genoa and at the University of Hamburg and was visiting scientist at MIT and the Max Planck Institute for the Physics of Complex Systems Dresden. From 2003 to 2007 he was at the head of a Volkswagen Foundation Junior Research Group at the University of Regensburg. Prof. Cuniberti has made lasting contributions to a wide range of areas from quantum dots, nanowires and nanotubes to biosystems, addressing transport phenomena, structural stability with important contributions to the theory and modeling of the electronic and structural properties of bottom up nanoscale materials. His activity addresses four main lines: (i) molecular and organic electronics, (ii) bionanotechnology, (iii) nanostructures, (iv) methods development. His research activity is internationally recognized in more than 200 scientific papers to date. He initiated and organized numerous workshops, and school-conferences and took part in international research training networks, offering extensive opportunities for young scientists. He has given plenary and invited talks at numerous international meetings. He received several talent scholarships and in 2001 the Max Planck Society Schloessmann award fellowship. He is distinguished visiting Distinguished Professor at the Division of IT Convergence Engineering of POSTECH, the Pohang University of Science and Technology and Adjunct Professor for the Department of Chemistry at the University of Alabama.
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Prof Ahmed Elmarakbi obtained his PhD in Mechanical Engineering from University of Toronto, Canada in 2004. After a couple of successful postdoctoral fellowships in Canada and Japan, he moved to the University of Sunderland in 2007, where he is currently Professor of Automotive Engineering. His research interests lie in the area of energy-efficient and safe vehicles including low carbon vehicles and advanced composite materials, including graphene, for automotive applications. Prof Ahmed Elmarakbi recently published the book Advanced Composite Materials for Automotive Applications: Structural Integrity and Crashworthiness (Wiley, UK) and has 15 years of experience managing national and international projects, including multi-disciplinary collaborative projects with Europe, USA, Canada, China, Japan, and Brazil. Ahmed has an extensive track record of collaboration with the automotive industry and world-class academic institutions over the last 15 years
Covalent chemistry of graphene, including doping with foreign elements in sp2 carbon matrix and sp3 – functionalization with various functional groups, represents a complex strategy providing imprinting exceptional electronic, magnetic, sensing, and surface properies into the realm of 2D materials (Georgakilas et al. Chem. Rev. 2012). Doping of graphene with sulfur and nitrogen will be demonstrated as an efficient approach for triggering a strong ferromagnetism in graphene (Blonski et al. JACS 2017; Tuček et al. Adv. Mater. 2016). N-doped graphene can also act as a molecular switch allowing to change the electronic/magnetic properties of planar molecules via their simple positioning on the 2D surface (de la Torre et al. Nat. Comm. 2018). Further, chemistry of fluorographene will be highlighted as a way toward a broad family of new graphene derivatives via combined elimination and nucleophilic substitution of fluorine. Thus, thiographene and hydroxofluorographene can be used as advanced DNA sensors and room temperature non-metallic 2D magnets, respectively (Urbanova et al. Adv. Mater. 2015; Tuček et al. Nat. Comm. 2017). Recently developed cyano-graphene and graphene acid (carboxy-graphene) possess an exceptional affinity to bind metallic and molecular species, thus creating highly efficient single atom catalysts and supercapacitors (Bakandritsos et al. ACS Nano 2017 and Adv. Funct. Mater. 2018). Finally, hybrids of fluorographene and metal organic frameworks (MOFs) will be introduced as superhydrophobic/oleophilic nanofibrous and hierarchical superstructures for the separation of oil fractions and organic solvents from water (Jayaramulu et al. Angewandte Chem. 2016 and Adv. Mater. 2017)
Radek Zbořil is a general director of Regional Centre of Advanced Technologies and Materials at the Palacký University in Olomouc (Czech Republic) and visiting scientist at the Friedrich-Alexander-University of Erlangen. After finishing PhD studies (in 2000), he absolved stays in Delaware, Tokyo or Johannesburg. He has published over 420 papers, which received over 20 000 citations. He is ranked among TOP 3 most cited Czech scientists (h-index=70/62; Google Scholar/Scopus). In 2018, prof. Zbořil was assigned as Highly Cited Researcher by Clarivate Analytics. He is an editorial board member of Applied Materials Today (Elsevier) and other journals published by Wiley and Nature family
The unique properties of single-walled carbon nanotube (SWNT) films, such as high porosity and specific surface area, low density, high ratio of optical transmittance to sheet resistance, high thermal conductivity and chemical sensitivity, and tunable metallic and semiconducting properties, open up avenues for a wide range of applications. Direct integration of the CNTs produced by the aerosol methods into different applications, especially for high-performance flexible and stretchable electronics, is discussed. Produced SWCNT/polymer composite films have exhibited excellent optical and electrical properties as well as high mechanical flexibility. It was found that the electrical conductivity of the SWCNT films could be significantly improved by densification and chemical doping processes. We have fabricated the state-of-the-art key components from the same single multifunctional SWNT material for several high-impact application areas: high efficiency nanoparticle filters, transparent and conductive electrodes, electrochemical sensors with extremely low detection limit, and polymer-free saturable absorbers for ultrafast femtosecond lasers. In addition, wide application potential of these networks is demonstrated by fabricating SWNTs produced by this method were successfully applied to felxible and stretchable electrodes and field effect transistors, gas sensors, supercapacitors, solar cells, and photodectors
Dr. Sc. Albert G. Nasibulin is a Professor at Skolkovo Institute of Science and Technology and an Adjunct Professor at the Department of Applied Physics of Aalto. He got his PhD in Physical Chemistry (1996) at Kemerovo State University (Russia) and Doctor of Science (Habilitation, 2011) at Saint-Petersburg Technical State University (Russia). He has specialized in the aerosol synthesis of nanomaterials (nanoparticles, carbon nanotubes and tetrapods), investigation of their growth mechanism and their applications. He has a successful background in an academic research with more than 220 peer-reviewed scientific publications and 23 patents.
The recent world wide hike in the crude oil price and the increasing concerns about gasoline supply and the impacts of Global warming has generated growing interest for “clean energy” with “zero emission” norms. It has become more important than ever to develop clean and renewable energy systems e.g. Fuel cells for direct conversion of chemical energy into electrical energy and portable energy storage devices e.g., Li-ion batteries(LiBs) and supercapacitors. Carbon electrode forms one of the vital components for all these devices. A host of conventional carbon materials like , graphite, coke, carbon microbeads, activated carbon , carbon blacks etc. are being used as electrodes for LiBs, fuel cells and supercapacitors. However, the fuel cell efficiency; energy density, power density and charge capacity of LiBs and supercapacitors is limited and controlled by the structure property of the carbon material used. Discovery of new forms of carbon nanomaterials like, fullerene, carbon nanotubes and grapheme has opened up new frontiers to meet this challenge for efficient energy conversion and storage. Compared to conventional carbon materials, carbon nanomaterials possess unique size-/surface-dependent properties like, higher surface area, higher mesoporosity, higher electrical conductivity, stronger mechanical strength and higher corrosion-resistance, useful for enhancing the energy-conversion and storage performances. Recent developments in the syntheses of carbon nanomaterials with controlled structures e.g., vertically aligned–CNTs, 3D pillared CNT-graphene architectures would speed up the applications of carbon nanomaterials for advanced energy conversion and storage. Further development in this exciting field will surely revolutionize the way in which future energy systems are developed. The talk will highlight global trends and some of the results from the authors own group on this topic
Dr. R.B. MATHUR has been associated with the CSIR- National Physical laboratory, New-Delhi, India, since 1977 before superannuation as Emeritus scientist in the year 2017. He specializes in Solid state Physics, X-ray spectroscopy; Advanced carbon products e.g. Carbon fibres;Carbon nanotubes, Graphene and polymer and carbon-carbon composites etc. During his active four decades of active R&D in the development of advanced carbon materials he has Published more than 160 research papers in peer reviewed SCI journals, Presented more than 200 papers in National/International conferences, Dr. R.B. MATHUR Written one Book on Carbon Nanomaterials, (Taylor & Francis Publications, 2017)
Tremendous development of graphene-based sensors for various applications has been observed over the past few decades. Humidity measurement is one of the most significant issues in the fields of medical diagnostics, environmental protection, industrial manufacture, agriculture, etc. In the present study, two types of graphene-based humidity sensors are considered and compared. There are flexible sensors created from CVD grown graphene and a composite of graphene suspension with PEDOT: PSS polymer. In the last case, the printed technologies are utilized for structure creation. The response (the resistance change) of a graphene-based humidity sensor is considered as a function of film structures. Adsorption of water molecules at grain boundary defects is found to lead to an increase in film resistivity due to the donor property of water and the p-type conductivity of graphene. Another type of conductive center with a higher capture cross-section is realized in the case of water molecule adsorption at edge defects in multilayer films (decrease of resistance). Sensor sensitivity is found to be high when only one type of defect determines water adsorption. In our case, the graphene sensor sensitivity R/R0 is found to vary in the range of 10 -30 %. Graphene: PEDOT: PSS composite allow us to create humidity sensors with response up to 220% and it has no limitation in the case of high humidity like PEDOT: PSS sensors. It was found that the response value depended not only content of composite, but also on the used substrate and film thickness.
Svetlana Smagulova has completed her Ph.D. from Institute of Semiconductor Physics in Novosibirsk, Russia. Nowadays, she is the head of laboratory “Graphene Nanotechnology” in the North-Eastern Federal University in Yakutsk in Russia. She has more than 100 papers in reputed journals
Organic semiconductors are relatively new member of semiconductor family and are composed of molecules containing carbon, hydrogen and other element. Melanin are pigment that colours skin, eyes and hair and it could be soon face a new generation of biologically friendly electronic devices in applications such as medical sensor and tissue stimulation treatment. Gaussian09 code which uses density functional theory as working principle was used to study electronic and transport properties of melanin structure. Three exchange functional: HF (HF), GGA (PBE) and Hybrid (B3LYP) were used at different basis set of 3-21G, 6-31G and 6-311G. it was found that at 6-311G level for the three exchange functional that total energy of -2981.03028, -2996.839821 and -3000.227297 eV respectively. However, the HOMO-LUMO energy gap was found to be 2.65 eV and is in agreement with the literature. Also information on IR and NMR (1H and 13C) were also reported.
Mansur Sa’id has completed his PhD from Bayero University Kano Nigeria and PhD research work at Fritz Haber Institute Berlin, Germany. He is the Head of Physics Department, Yusuf Maitama Sule University Kano, Nigeria. He has published more than 20 papers in reputed journals and has been serving as an editorial board member of Bayero Journal of Mathematics and Physics
Prof. Chiashian Chuang has completed his PhD from National Taiwan University, Taiwan and was a JSPS foreign postdoctoral fellow from Graduate of School of Engineering, Chiba University, Japan. He currently is an assistant professor at department of electronic engineering, Chung Yuan Christian University. He has published 30 SCI papers in reputed journals with hindex 9 and more than 200 citations.
Prof. Chiashian Chuang has completed his PhD from National Taiwan University, Taiwan and was a JSPS foreign postdoctoral fellow from Graduate of School of Engineering, Chiba University, Japan. He currently is an assistant professor at department of electronic engineering, Chung Yuan Christian University. He has published 30 SCI papers in reputed journals with hindex 9 and more than 200 citations.
Chronic wounds represent a global public challenge for the healthcare system. In chronic wounds, microbial infections together with biofilm formation and multidrug resistance strains may contribute in the prolongation of inflammatory phase, hindering the healing process. Graphene oxide (GO) showed an interesting antibacterial activity against both Gram-positive and Gram-negative bacteria. The aim of this work was to investigate the in vitro antimicrobial and antibiofilm effect of GO against chronic wound-related microrganisms. Clinical isolates, Staphylococcus aureus PECHA 10, Pseudomonas aeruginosa PECHA 4 and Candida albicans X3, were incubated with GO (50 g/mL) for 2h and 24h to evaluate the immediate and tardive antimicrobial effect. Optical and Atomic force microscopy images were performed to visualize the GO effect on microbial cells. The GO antibiofilm effect was tested on in-formation and mature biofilm of S. aureus, P. aeruginosa and C. albicans. Moreover, an innovative in vitro wound biofilm model (Lubbock model) formed by S. aureus and P. aeruginosa was performed to evaluate the effect of GO incorporated on hydrocellulose film. GO significantly reduced the S. aureus growth both at 2h and 24 h in a time dependent way, and displayed a bacteriostatic effect in respect to the GO t=0; an immediate (after 2h) slowdown of bacterial growth was detected for P. aeruginosa whereas a tardive effect (after 24h) was recorded for C. albicans. Atomic force microscopy images showed the complete wrapping of S. aureus and C. albicans with GO sheets that explains its antimicrobial activity. Moreover, for each detected microorganism, a significant inhibition of biofilm formation and mature biofilm reduction were recorded. Preliminary results about Lubbock model show interesting antibacterial effect of GO hydrocellulose film on S. aureus and P. aeruginosa dual-biofilm. GO showed antibacterial and antibiofilm properties against chronic wound microrganisms making it an interesting candidate to incorporate into wound dressing to tackle the microbial infection in chronic wounds.
Mara Di Giulio, microbiologist. She is PhD in Cytomorphologic and Biomedical Sciences at the University of “G. d’Annunzio” Chieti-Pescara, Italy. She is currently a Researcher senior in Microbiology at the Department of Pharmacy, University of “G. d’Annunzio”. She has published 50 peer reviewed papers and her research interest focus on the evaluation of the antimicrobial, anti-biofilm and anti-virulence activities of natural substances, compounds deriving from essential oils, semi-synthesis compounds, innovative biomaterials such as silver nanoparticles, Graphene-based materials: Graphene-loaded liposomes, Graphene-oxide on etiologically relevant microorganisms. She published two recent papers on Graphene against wound-related microrganisms.
Surface plasmons has been utilized as the basis for plasmonic sensors with Kretschmann configuration, providing label-free and real-time monitoring of binding interaction between probe and target moieties. Although graphene has recently been extensively investigated in the field of optical sensors for the improvement of sensing performance, the proposed enhancement mechanisms in each study are ambiguous and inconsistent. Here, we report graphene-deposited Au film as advanced plasmonic sensing substrates. Work function measurements of Au-graphene with different number of layer and doping state explicitly corroborate the mechanism of sensitivity increase, confirming that the enhanced refractive index sensitivity originated from induced surface dipole due to the charge transfer between Au film and graphene. In recent years, the combined therapy using gold hybrid nanomaterials has been broadly adopted to pioneer new anticancer treatments. However, their synergistic anticancer effects have yet to be thoroughly investigated. Herein, a hybrid gold nanobipyramid nanostructure coated with molybdenum disulfide (MoS2) semiconductor (AuNBPs@MoS2) was proposed as a smart nanozyme for anticancer therapy and two-photon bioimaging. The hybrid material showed dramatically enhanced localized surface plasmon resonance property under excitation owing to its anisotropic nature, coupled with the rich electron density in MoS2, resulting in the superior in situ photo-generation of reactive oxidative species (ROSs). We demonstrated that the synergistic effect of enhanced photothermal conversion and generation of ROS could increase the anticancer effect of AuNBPs@MoS2. Two-photon imaging confirmed that AuNBPs@MoS2 was successfully internalized in cancer cells and that simultaneous anticancer treatments based on catalytic and photothermal therapy could be achieved
Prof. Dong Ha Kim completed Ph.D. in the Department of Fiber and Polymer Science at Seoul National University, Korea in 2000. He was postdoctoral researcher in the Polymer Science and Engineering Department at the University of Massachusetts at Amherst and in the Materials Science Department at the Max Planck Institute for Polymer Research. He is currently is a Full Professor, Ewha Fellow and Fellow of RSC. His research group pursues to develop nanomaterials for energy, environment, memory, display, and theragnosis. Currently, he is Editorial Board Member of Scientific Reports and Advisory Board Member of Journal of Materials Chemistry A and Nanoscale
Graphene-based materials such as carbon nanotube (CNT) and graphene itself have attracted much attention due to their outstanding properties as well as emerging applications. As is the case for the synthesis of diamond, graphene-based materials can be synthesized by plasma-enhanced chemical vapor deposition (PECVD) on heated substrates (600-800 ˚C) employing methane and hydrogen mixtures. Their structures highly depend on the nucleation. In the case of CNT film growth, for example, catalyst nanoparticles such as Fe and Co should be prepared on the substrate as pretreatment. Plane graphene formation can be realized by PECVD on the plane layer of Ni or Cu in the remote plasma configuration at relatively low temperatures. In fact, ion bombardment on the growing surface induces the nucleation of nanographene, resulting in the formation of vertical nanographene (carbon nanowall, CNW). CNWs are few-layer graphenes standing vertically on a substrate to form a self-supported network of wall structures. CNWs and similar vertical grapnene structures are sometimes decorated with metal nanoparticles and biomolecules. The maze-like architecture of CNWs with large-surface-area graphene planes would be useful as electrodes for energy devices, electrochemical and biosensors. Morphology including structure and crystallinity as well as electrical properties of carbon nanostructures should be controlled according to their applications. We report the current status of the synthesis of plane graphene and vertical graphene using PECVD, and focus on the control of the CNW structures during the growth processes including nucleation to be used as platform of the electrochemical and bio applications
Dr. Mineo Hiramatsu is a Full Professor of Department of Electrical and Electronic Engineering and the Director of Research Institute, Meijo University, Japan. He served as the Director of The Japan Society of Applied Physics. His main fields of research are plasma diagnostics and plasma processing for the synthesis of thin films and nanostructured materials. He served as chairman and member of organizing and scientific committees of international conferences on plasma chemistry and plasma processing. He was awarded the Japan Society of Applied Physics Fellow in 2017
Electrochemical capacitors, also known as supercapacitors, are considered one of the promising energy storage devices and have drawn increasing attention because of their unique properties such as the fast charge-discharge rate, high power density and long cycle lifetime. However, as the main drawback when compared to lithium-ion batteries, the relatively low energy density of the supercapacitor limits its applications in many electronics fields. The accessible specific surface area, electric conductivity, and pore size distribution of carbon materials will determine their supercapacitive performance. In this contribution, hierarchical nanoporous carbon (NPC) materials are prepared from nanoscaled metal-organic frameworks (MOF) by annealing. The annealing temperature has a profound influence on the morphology of the NPC materials which in turn impact the electrochemical performance. Compared to annealing at low temperature, an interconnected structure is formed at higher annealing temperature to produce a larger accessible surface area and higher conductivity. Owing to these unique properties, the two-electrode configuration constructed with the carbon sample has the higher specific capacitance and the longer cycle stability than the disconnected structure. For example, the specific capacitances are 298 F/g at a scanning rate of 1 mV/s in symmetrical supercapacitor device. Furthermore, 96.73% of the capacity is retained after 5000 cycles in 1 M H2SO4 electrolyte. In an organic electrolyte, the supercapacitor cells composed of NPC produce an energy density of 43 Wh/kg. The NPC materials with large specific capacity and excellent stability produced by the simple and cost effective technique have large potential in supercapacitors.  Zhang, S.; Shi, X.Z.; Moszyńskia, D.; Tang, T.; Chu, P.K.; Chen, X.C.; Mijowska, E. 2018. Hierarchical Porous Carbon Materials from Nanosized Metal-organic Complex for High-Performance Symmetrical Supercapacitor. Electrochimica Acta, 269, 580-589
Xuecheng Chen has completed his PhD from Technical Institute of Physics and Chemistry, Chinese Academy of Sciences (CAS), China and postdoctoral studies from West Pomeranian University of Technology, Poland. Now he is the professor of Nanomaterials Physicochemistry Department in West Pomeranian University of Technology. His research is focusing on the preparation of porous carbon materials and the applications in electrochemical energy stroage, for example, lithium ion battery and supercapacitor. He has published more than 70 papers in reputed journals.
A novel binder-free electrode material and multicomponent design of NiCo2O4 (NCO) nanoplates adhered to NiMoO4 (NMO) honeycomb composites was prepared on nickel foam (NF) using a simple chemical bath deposition strategy. This paper reports the synthesis of a honeycomb with folded silk-like NF@NMO@NCO nanostructures on nickel foam and its use to increase the availability of electrochemically active sites to provide more pathways for electron transport and improve the utilization rate of the electrode materials. As a result, the as-fabricated NF@NMO@NCO electrode exhibited a maximum specific capacitance of 2695 F g-1 at a current density of 20 mA cm-2, which is much better than that of NF@NCO nanoplates (1018 F g-1) and NF@NMO honeycomb (1194 F g-1). Moreover, the as-synthesized NF@NMO@NCO achieved a high energy density of 61.2 W h kg-1 and outstanding power density of 371.5 W kg-1 as well as exceptional capacitance retention of 98.9% after 3000 cycles. The outstanding electrochemical performance makes the honeycomb with a folded silk-like nanostructure a promising candidate for advanced electrochemical energy storage.
Dr. Yedluri Anil Kumar got Master’s degree of Electrical Engineering (Energy storage application), Pusan National University, Busan city, South Korea. At present he is doctoral student of Department of Electrical Engineering in Pusan National University (Busan, South Korea). He has published more than 5 papers in reputed journals on supercapacitor applications and energy storage applications
Chandu Venkata Veera Muralee Gopi received his Ph.D degree in Electrical and Computer Engineering at the Pusan National University (South Korea) in 2018 under the guidance of Prof. Hee-Je Kim. He is now a Postdoctoral researcher in Pusan National University. His current scientific interests focus on design, synthesis and application of nanomaterials for applications in energy conversion/storage. He has published over 66 papers is reputed journals
The demand for electrochemical energy storage (EES) devices is continuously growing owing to the expanding markets for portable electronics and electric transportation as well as the emerging application in efficient utilization of renewable energies. Developing advanced electrode materials for high-performance electrochemical energy storage is the key step. In comparison with the electrochemical double layer capacitor materials based on electrostatic adsorption mechanism, transition metal oxides (TMOs) show more promising prospects in advanced EES systems because they make use of redox reactions to store electrical energy, offering much higher energy storage performance. Therefore, for the first time, we demonstrate the fabrication of Fe2O3@LiCoO2 hybrid nanostructures on Ni foam substrate by facile one-step hydrothermal technique. Morphological studies reveal that aggregated Fe2O3 nanoflakes anchored on the surface of sphere-like LiCoO2 nanoflakes. Electrochemical studies are used to examine the performance of the supercapacitor electrodes. The composite Fe2O3@LiCoO2 electrode exhibited excellent electrochemical performance than Fe2O3 and LiCoO2 electrodes, such as a low charge transfer resistance, a high specific capacitance of 489 F g-1 at 5 m A cm-2 and an enhanced capacity retention of 108% over 3000 cycles at 15 m A cm-2. The composite Fe2O3@LiCoO2 holds great promise for electrochemical applications due to well-defined hierarchical morphology, synergetic effect of Fe2O3 and LiCoO2, enhanced electrical conductivity, efficient electrolyte penetration and fast electron transfer
Maurizio Sansotera has completed his PhD from Politecnico di Milano, Italy, spending part of his postdoctoral studies at Università degli Studi di Milano, Italy and at Ben-Gurion University of the Negev, Israel. He recently became the head of Fluoritech - Laboratory of Fluorine Chemistry and Fluorinated Materials at Politecnico di Milano. He has published more than 40 papers in reputed journals
The science and application of carbon-based nanostructures is quickly under development. The great interest on this class of molecules is due to their distinctive properties which arise from the union of the unique features of sp2 hybridized carbon bonds and the unusual characteristics of physics as well as chemistry at the nanoscale level. Accordingly, the functionalization of carbon-based nanomaterials opens a wide range of opportunities for altering their structural and electronic properties and affords new types of carbon-based materials with useful properties of their own. On the basis of our experience on functionalization of carbonaceous materials with perfluoropolyether (PFPE) peroxides, we started to approach the chemical linkage of PFPE chains also to carbon-based nanomaterials. As first result, superhydrophobic conductive multi-walled carbon nanotubes (MWCNTs) were prepared by thermal decomposition of the PFPE peroxide. Reactive PFPE radicals were generated in the reaction environment and they reacted with the unsaturated moieties on MW-CNT surface. The PFPE-modified MW-CNTs were characterized by XPS, TGA, XRD, SEM and measurements of contact angle, surface area as well as resistivity at different applied pressures. Multi-layer CVD graphene grown on nickel substrates was also synthesized and functionalized with PFPE chains via peroxide decomposition and radical reaction. Graphene samples were treated using different amounts of PFPE peroxide and the effects of the treatment were studied through Raman spectroscopy, grazing angle FT-IR, XPS and contact angle measurements. New perspectives and preliminary results on functionalization of single-walled carbon nanotubes (SW-CNTs), highly oriented pyrolytic graphite (HOPG) and fullerenes by covalent linkage of PFPE chains are also discussed.
The development of new materials with different properties and industrial applications is being explored and investigated. Further, it is necessary to obtain materials with good physical and thermodynamic properties such as: high hardness, low thermal and electrical conductivity, good corrosion resistance and high mechanical resistance. The composites are materials used with wide variety and purposes in several industrial areas. They are produced and designed to be more resilient, light and functional, with unique properties and cost-effective cost. But it should be noted that global technology has generated great diversity in the market and globalization of the economy; however, an intense environmental impact. Hydrogen is one of the ideal source of electric power transformation, thus being able to be used in fuel cell systems for power generation efficiently. The structure of the films from the metal matrix plus graphene oxide, observes a barrier in the formation in the layers. Researches that were developed with quasicrystalline alloys plus graphene / graphene oxide addition, have shown that this formed composites are excellent for hydrogen storage and other industrial applications. In this work, the use of physical-chemical characterization techniques such as; XRD to analyze the formation of the composite between the quasicrystalline alloy and graphene, scanning electron microscopy - SEM, allowing the study of the surface microstructure of the composite and the other experimental analyzes to evaluate the material produced.
Reza Jamshidi Rodbari, Ph.D. in Material Science and Engineering at the Federal University of Pernambuco (UFPE), Brazil. Member of the board, Executive Director at R & C Jam Catalyst Industrial Group, in the sector of energy sustainability and petrochemical industry. Participation of International OMICS Congresses on Petrochemicals and Chemical Engineering in 2013 San Antonio/2014 in Las Vegas/Part of the organizing committee of the World Conference and Expo on Petrochemicals and Natural Resources 2018 Prague/Two Books with ISBN/An International Patent in the Catalyst Area, and 35 articles publications
Quasicrystals are materials with good physical, thermodynamic, electronic, surface and magnetic properties, due to this, it has a wide industrial applicability. However, we always attract attention many researchers in technology innovation in the development of nano-structured materials. Mainly advantages that the quasicrystalline alloys propitiates in the catalytic reactions. The magnetic behavior of the quasicrystalline Al62.2Cu25.3Fe12.5, and the conduction electrons are essentially the location of the eminence of the unpaired electronic spins that are present in the quasicrystalline alloy; (Mn, Fe) and rare earth metal atoms are studies explored in magnetism. The magnetic properties of the Al-Cu-Fe alloy, which is stable in the icosahedral phase, show a linear relationship between magnetic susceptibility and electron state density at the Fermi (FE) energy level, including temperature dependence, and the Pauli Energy in the paramagnetic. For this purpose, it makes the techniques of Physical-chemical characterization, such as: Diffraction (XRD) and Scanning Electron Microscopy (SEM). Energy dispersive spectroscopy (EDS), Paramagnetic Resonance Spectroscopy (EPR), Vibrant Sample Magnetometer (MAV) and others.
Doctoral in Chemical Engineering/Masters of Mechanical Engineering-emphasis in Materials Science/Bachelor degree in Physics-Solid state/Bachelor degree in Industrial Chemistry/Bachelor degree in Chemistry/ Specialist in the teaching of Mathematics by IMPA/UFPB/ Specialization course in Chemistry EDX/MITX from the Massachusetts Institute of Technology/ 22 courses Human Resources in Oil and Natural Gas Program (PRH-28), National Petroleum Agency-Natural Gas (ANP) PETROBRAS (Brazil). More than 60 publications on international and national journals (Environment, Education and Technology of Petroleum)/Reviewer international journal of Elsevier/National scientific Journals and Participation of International Congresses of OMICS on Petrochemicals and Chemical Engineering on 2013 San Antonio / 2014 in Las Vegas/Part of the organizing committee of the World Conference and Expo on Petrochemicals and Natural Resources 2018 Prague/Two Books with ISBN/ An International Patent in Catalyst Area.