We demonstrate a direct physical exfoliation and transfer processes of graphene grown via ethanol-chemical vapor deposition (CVD). Our exfoliation process exploits a polydimethylsiloxane (PDMS) stamp for conformal contact with graphene. Moreover, it rapidly exfoliates a few-layer graphene (FLG) film with high quality from entire graphene layers on Ni within 5 min. Indeed, the process time is significantly faster than few hours for a standard process. Even after exfoliation, our graphene shows high quality which is verified by the high intensity ratio of G band to D band in Raman spectra. The ratio of our graphene is approximately five times higher than that of standard graphene that implies low defects in our graphene. The technology for exfoliating a FLG film can be used for highly desired layer-by-layer manipulation of graphene.

References :
Kwanghyun Yoo, Yusuke Takei, Bo Hou, Shohei Chiashi, Shigeo Maruyama, Kiyoshi Matsumoto, and Isao Shimoyama, "Direct Physical Exfoliation And Transfer of Graphene Grown Via Ethanol Chemical Vapor Deposition,”IEEE 24th International Conference on Micro Electro Mechanical Systems (MEMS '11), pp. 513-516, Cancun, Mexico, Jan. 23-27, 2011． [Proceedings]