Scientific Program

Conference Series Ltd invites all the participants across the globe to attend 2nd World Congress and Expo on Graphene & 2D Materials Frankfurt, Germany.

Day 1 :

Keynote Forum

John Bell

Queensland University of Technology, Australia

Keynote: Graphene and graphene-based devices: A future for electronics

Time : 09:30-10:10

OMICS International Graphene World 2017 International Conference Keynote Speaker John Bell photo
Biography:

John Bell completed his PhD from the University of New South Wales (Sydeny, Australia) and undertook Postdoctoral Studies at Cornell University and CSIRO before commencing his academic career at the University of Technology Sydney. He is currently the Head of the School of Chemistry, Physics and Mechanical Engineering at the Queensland University of Technology, in Brisbane, Australia. He has published more than 140 refereed papers in international journals, is an Editorial Board Member of Scientific Reports and is Chair of the Engineers Australia Working Group on Nanoengineering.

 

Abstract:

Low dimensional materials have numerous unique attributes, such as ballistic electron transport and high thermal conductivity as in carbon nanotubes and graphite. The interactions between these carbon-based materials and conducting polymers can lead to nanoscale heterojunctions, and open up the possibility of nanoscale electronic devices. The advantages of these type of electronic structures over traditional semiconductor devices are the possibility of large scale nanoelectronic device fabrication using self-assembly processes. The properties of a range of carbon nanotube and graphene nanomaterials and their properties relevant to electronic device applications will be presented, ranging from high quality single layer graphenes produced in a plasma process through vertically-aligned graphenes produced from natural precursors, also using plasma processes. These methods produce materials suited for both electronic conductors that can be transferred between substrates through to densely packed and aligned graphene materials exhibiting large specific capacitance and suitable as storage electrodes. This presentation will explore how this range of graphene materials, in conjunction with other carbon-based materials such as advanced electronic polymers will lead to a new generation of nanoelectronic devices.

 

Keynote Forum

Christophe Laurent

Toulouse University, France

Keynote: Graphene-ceramic nanocomposites

Time : 10:10-10:50

OMICS International Graphene World 2017 International Conference Keynote Speaker Christophe Laurent photo
Biography:

Ch Laurent is a Full Professor of Materials Chemistry at Toulouse University (Université Paul-Sabatier), currently Director of CIRIMAT, the Interuniversity Center for Materials Research and Engineering, and former head (1998-2015) of its Nanocomposites and Carbon Nanotubes team. He got his BSc and MSc in Chemistry, and Doctor in Materials Sciences degree (PhD) at Toulouse University. Currently his researches focus on the synthesis of carbon nanotubes and graphene (notably the selectivity on the number of walls/layers), ceramic- and metal-matrix nanocomposites and spark plasma sintering. He has published more than 110 papers in peer-reviewed journals.

 

Abstract:

Graphene-ceramic composites are focusing worldwide attention because they allow to combine some very attractive electrical, thermal and mechanical properties. Among the matrices investigated are Si3N4, TaC, Al2O3, ZrO2-toughened Al2O3, MgO, hydroxyapatite and SiO2, the latter mainly as film. It is acknowledged that one of the main challenges of the field is to develop processing routes ensuring homogeneous dispersion of graphene in the ceramic matrix, without inducing contamination and introducing undesirable structural defects. These routes will be reviewed. Consolidation is performed by several techniques including hot isostatic pressing (HIP) and spark plasma sintering (SPS). One key feature is that the grapheneinduced grain-size refinement of the matrix is to be taken into account when discussing the properties. Results on the electrical, thermal and mechanical properties will be discussed. The proposed mechanical reinforment and toughning mechanisms, such as graphene pullout, crack bridging, crack deflection and crack branching will be presented. When appropriate, a parallel with carbon nanotube-ceramic composites will be made.

 

Keynote Forum

Zheng Liu

Nanyang Technological University, Singapore

Keynote: CVD approach of atom-thin transition metal dichalcogenides: Synthetic strategy and case studies

Time : 11:10-11:40

OMICS International Graphene World 2017 International Conference Keynote Speaker Zheng Liu photo
Biography:

Zheng Liu received his B.S. degrees (2005) at Nankai University (China), and completed his Ph.D at National Center for Nanoscience and Technology (NCNST, China), working on the synthesis and energy harvest of carbon nanotubes. He then worked in Prof. Pulickel M. Ajayan and Prof. Jun Lou’s groups as a joint postdoc research fellow (2010~2012) and research scientist (2012~2013) at Rice University (USA), focusing on the synthesis and applications of two-dimensional (2D) crystals, including graphene, hexagonal boron nitride (h-BN, so called “white graphene”), oxides and transition metal dichalcogenides (TMDs: MoS2, WS2, MoSe2 etc.) He has published >130 peer-reviewed papers in top journals, including 16 papers in Nature serial journals (Nature Materials, Nature Nanotechnology and Nature Communications) and Science Advances; 21 in Nano Letters; 15 in Advanced Maters; 8 in ACS Nano, with total citations more than 11000 and H-index of 46. He was also a recipient of World Technology Award in Energy category in 2012. This award has been presented as a way to honor those in doing "the innovative work of the greatest likely long-term significance." He was awarded the prestigious Singapore NRF Fellowship and Nanyang Assistant Professorship in 2013.

Abstract:

The one-atom-think crystal like graphene has fantastic properties and attracted tremendous interests in these years, which open a window to the landscape of the two-dimensional (2D) materials. There are a large variety of 2D materials beyond graphene that are to be explored. Using chemical solid reaction and chemical vapour deposition, we have successfully synthesized a wide spectrum of 2D materials (both single crystals and few layers), including: 1. Binary 2D materials: Borides (h- BN, WB), TMDs (MoS2, WSe2, MoSe2, WSe2, MoTe2, WSe2, ReS2, ReSe2, PtS2, PtSe2, PdS2, PdSe2, NbSe2, SnS2, SnSe, SnSe2, TiS3, HfSe3, HfTe3, TiSe2, TaTe2, TaSe2), and others (InSe, In2Se3, GaSe, SrSi2, Ta3S2, BiI3, PbI2), etc; 2. Ternary and multi-component 2D materials: BxCyNz, MoxW1-xS2, MoWTe4, MoS2xSe2(1-x), WSe2xTe2(1-x), ReS2xSe2(1-x), Ta2NiS5, Ta2NiSe5, Ta2ISe8, TixTa1-xS2, TixNb1-xS2, Ta3Pd3Te14, NiPS3, FePS3, ZnIn2S4, Ta2SeI, V2AlC, W2AlC, CuIP2S4, Tl2Mn2O7; 3. Heterostructured 2D materials: Graphene/h-BN, MoS2/WS2, WSe2/MoSe2; 4. Organ/Inorganic heterostructures: MoS2/Rubrene, Organic Perovskite/2D. Potential applications of 2D materials have been developed, such as ultrathin high-temperature oxidation-resistant coatings 2D anisotropic electronics (FETs, resonators and photodetectors), energy harvester, lithium ion battery and catalyst and wearable devices, etc. These applications pave a promising way to the large-scale applications of 2D materials.

Keynote Forum

Lev Kantorovich

King’s College London, UK

Keynote: Theoretical modeling of early stages of graphene growth by epitaxial methods

Time : 11:40-12:10

OMICS International Graphene World 2017 International Conference Keynote Speaker Lev Kantorovich photo
Biography:

Lev Kantorovich got his PhD in Latvia (former USSR) in 1985 in the area of Solid State Physics. In 1993-94 he spent one-year in Oviedo, Spain, as an Invited Professor. In 1994, he took a Postdoctoral Position at Keele University (UK), then a number of Postdoctoral appointments followed at University College London since 1996. In 2002, he was appointed a Lecturer at Physics Department of King’s College London (UK), then promoted to Reader in 2005 and Professor in 2009. He is a winner of a Teaching Excellence Award (twice: 2005, 2010) and of the Distinguished Supervisor Award (2007). He has been teaching at KCL the second year maths course, and two advanced 4th year sub-courses on Green’s functions and group theory. His current research interests lie in modeling STM and AFM imaging of surfaces, as well as imaging and manipulation of atoms and molecules on them; dissipation in non-contact AFM; quantum conductance with non-equilibrium Green’s functions (NEGF); classical and quantum Generalised Langevin dynamics; thermostatting in MD simulations; self-assembly of organic molecules on crystal surfaces including kinetics of assemblies; role of van der Waals interaction in surface thermodynamics and interaction of molecules with surfaces; order-N DFT-based methods for extended systems (a fragmentation approach); understanding of growth of graphene by epitaxial methods; kinetics of phase transitions of self-assembled molecular films on surfaces; Kinetic Monte Carlo methods.

Abstract:

One method of growing epitaxial graphene is temperature programmed growth (TPG). In this method, hydrocarbon molecules are deposited onto a transition metal surface at room temperature and then the temperature is increased in order to facilitate the thermal decomposition of the hydrocarbons and lead to the formation of graphene flakes. The thermal decomposition mechanism of ethylene was investigated with a combined approach of experimental and theoretical techniques. X-ray photoelectron spectroscopy (XPS) experiments were used along with core level binding energy calculations to identify the evolution of species on the Ir(111) surface as the temperature is increased. A complete reaction scheme incorporating all possible reactions between the various CnHm species, from ethylene to C monomers and dimers, was also developed. The energy barriers for each reaction were calculated using the DFT based nudged elastic band method. For the most important reactions the prefactors to the rates were also calculated. These were then used to simulate the kinetics and determine the species evolution on the surface with time (temperature). This resulting temperature evolution is found to agree with the photoemission measurements. The molecular dissociation mechanism begins with the dehydrogenation of ethylene to vinylidene (CH2C), which is then converted to acetylene (CHCH) by the removal and addition of a H atom. The C-C bond is then broken to form methylidyne (CH), which finally dehydrogenates to produce C monomers that are available for the early stage nucleation of the graphene islands. Our method has laso been applied to Chemical Vapour Deposition (CVD) method and the corresponding resulting mechanism of ethylene and methane decomposition are compared with that obtained using simulations of TPG. Following from this, the nucleation of carbon clusters prior to the formation of graphene islands was also investigated. The number of carbon atoms in the critical cluster, which is equally likely to grow or to shrink in the prevailing conditions, was determined by the considering appropriate nucleation free energy. Using ab initio density functional theory calculations, the free energies of carbon clusters (containing up 16 C atoms) on the Ir(111) surface were calculated based on the configurational and vibrational contributions. The results are strongly dependent on temperature, showing its importance to cluster growth. Furthermore, we find that different types of clusters (linear, compact, dome, etc.) are more stable over different size ranges. Then mechanisms, which allow the clusters to reconstruct their structure type, are investigated.