Location: A718, SINANO
Abstract:
Graphene, being a two-dimensional material with carbon atoms arranged in a honeycomb lattice structure, has drawn enormous attention recently because of its superior mechanical strength, extraordinary high carrier mobilities and thermal conductivities, ease for surface functionalization, supreme optical properties, etc. There have been a variety of methods developed to synthesize graphene, e.g. mechanical exfoliationfrom highly ordered pyrolytic graphite (HOPG), chemical reduction of graphite oxide, high temperature annealing of single crystal silicon carbide, chemical vapor deposition (CVD), etc. In this talk, I will introducetwo different methods to synthesize graphene from solid carbon sources (PMMA and PDMS) as well as two facile N-dpoingapproaches (ex-situ and in-situ) with plasma enhanced CVD. The utilization of reactive hydrogen plasmas enable the graphene growth at reduced temperature as compared with conventional CVD processes, which makes it possible of in-situ growth of graphene patterns on low temperature substrates. Then I will talk about the role of graphene in lithium ion batteries and supercapacitorsfor nanomaterials, i.e., Si thin films, Sn nanoparticles, Ge thin films, Fe3O4 nanoparticles, Si nanowires (SiNRs), Si nanotubes (SiNTs) and NiO2 nanoflakes.
Biography:
Dr. Wang is a Postdoctoral Fellow in the Department of Physics and Astronomy at KU Leuven. Dr. Wang received his B.S. Degree from Huaiyin Normal University in 2005, M.S. Degree from University of Electric Science and Technology of China in 2009 and Ph. D. degree from City University of Hong Kong in 2013. Dr. Wang’s research interests include plasma synthesis of thin film and nanomaterials, such as graphene and beyond two dimensional materials, and their applications in electrical devices, Li-ion batteries, supercapacitors. Dr. Wang has published more than 40 scientific papers in Advanced Materials, Nano Today, Nanoscale, J Mater Chem. A. Appl. Phys. Lett, Carbon, etc. He also contributed to one book chapter in Graphene Science Handbook (CRC press Taylor & Francis Group France, 2014). He received CityUOutstanding Academic Performance Award (2012) and CityU Outstanding Research Thesis Award (total 7 in 2013).
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