Nanotech 2010

Large area graphene sheets synthesized on a bi-metallic catalyst system

E. Dervishi, Z. Li, J. Shyaka, F. Watanabe, A. Biswas, J.L. Umwungeri, A. Courte, A.R. Biris, A.S. Biris
University of Arkansas at Little Rock, US

Keywords: few layer graphene, characterization

Abstract:

Few layer graphene sheets were synthesized on a bimetallic catalyst system utilizing acetylene as the hydrocarbon source. This is a low-cost method for large scale production of graphene via radio-frequency chemical vapor deposition. The as-produced graphene sheets were purified in a single step by washing with a diluted hydrochloric acid solution under sonication. Next, they were thoroughly characterized by microscopy, spectroscopy, surface area analysis and X-Ray diffraction. Furthermore, large area graphene sheets (several micro meters) were obtained as the flow rate of the acetylene was increased. This is a substrate free synthesis which makes it very attractive and flexible for a scaled up graphene production. Therefore, by controlling the hydrocarbon concentration during the chemical vapor deposition, we were able to vary the size of the graphene sheets. Advanced microscopy analyses indicated the formation of few-layered graphene sheets. The large area graphene synthesized by a straightforward and inexpensive method can be utilized for various advanced applications such as nano-electronics and solar cell devices.
 
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