Controllability in graphene synthesis is essential for high performance electronics application. One of the most promising methods to synthesis graphene is chemical vapor deposition (CVD). Challenges associated with the growth of graphene films in CVD approach include the better controllability over several important parameters: the number of layer, the size of single crystalline, lower growth temperature, and spatial lattice orientation. In this talk, we review our recent progress in the control synthesis of the graphene films. We report a simple but efficient strategy to synthesis large-area, single-crystalline graphene by controlling the supply of carbon source in chemical vapor deposition process at very low temperature. We also emphasize the importance of the growth condition and rational design of the metallic catalyst substrate for the realization of the homogenous thickness of graphene films. Finally, we discuss a chemical vapor deposition method that allows the direct synthesis of graphene in self-oriented assembly. The approaches presented here provide a nice controllability, and enables the possibility for large graphene single crystal, which is of vital importance for practical applications. Raman spectroscopy, transmission electron microscopy and electrical transport measurement show that the graphene we obtained are in high quality. Our work opens a new platform for the graphene based nanoelectronics and optoelectronics.
Dr. Wang received his B.E. and M.E. degree from the Department of Solid State Electronics in Huazhong University of Science and Technology in June 1999 and June 2002, respectively. He was pursuing his Ph.D degree in the department of electrical and computer engineering of National University of Singapore (NUS) from 2004.8 to 2008.8. From August 2008 to May 2009, he worked as a research fellow in the same department and then in Nanyang Technological University until Nov. 2011. At the end of 2011, Dr. Wang was appointed as a research professor at State Key Laboratory of Functional Materials for Informatics of SIMIT. His research region is experimental condensed matter physics with an emphasis on physical properties and applications of low dimensional materials. The focus of his research is the mesoscopic investigation of electronic transport phenomena of two dimensional carbon materials. The recent availability of novel nanoscale materials, such as carbon nanowalls and atomically thin 2-dimensional crystals is enabling the assembly and study of ‘molecular’ electronics and mechanical devices, and also, the exploration of fundamental physics and potential application in high speed electronics and the superconducting electronics.