Controlled Synthesis of Monolayer Graphene Toward Transparent Flexible Conductive Film Application
1 Department of Advanced Materials Science and Engineering, Kangwon National University, Chuncheon, Gangwon-do, 200-701, Korea
2 Electronics and Telecommunications Research Institute, Daejeon, 305-600, Korea
Nanoscale Research Letters 2010, 5:1768-1773 doi:10.1007/s11671-010-9708-9Published: 28 July 2010
We demonstrate the synthesis of monolayer graphene using thermal chemical vapor deposition and successive transfer onto arbitrary substrates toward transparent flexible conductive film application. We used electron-beam-deposited Ni thin film as a synthetic catalyst and introduced a gas mixture consisting of methane and hydrogen. To optimize the synthesis condition, we investigated the effects of synthetic temperature and cooling rate in the ranges of 850–1,000°C and 2–8°C/min, respectively. It was found that a cooling rate of 4°C/min after 1,000°C synthesis is the most effective condition for monolayer graphene production. We also successfully transferred as-synthesized graphene films to arbitrary substrates such as silicon-dioxide-coated wafers, glass, and polyethylene terephthalate sheets to develop transparent, flexible, and conductive film application.