摘要
Large-area monolayer graphene samples grown on polycrystalline copper foil by thermal chemical vapor deposition with differing CH4 flux and growth time are investigated by Raman spectra, scanning electron microscopy, atomic force microscopy, and scanning tunneling microscopy. The defects, number of layers, and quality of graphene are shown to be controllable through tuning the reaction conditions： ideally to 2-3 sccm CH4 for 30 minutes.
Large-area monolayer graphene samples grown on polycrystalline copper foil by thermal chemical vapor deposition with differing CH4 flux and growth time are investigated by Raman spectra, scanning electron microscopy, atomic force microscopy, and scanning tunneling microscopy. The defects, number of layers, and quality of graphene are shown to be controllable through tuning the reaction conditions： ideally to 2-3 sccm CH4 for 30 minutes.
基金
supported by the National Basic Research Program of China(Grant Nos.2013CB933604,2010CB923004,and 2009CB929103)
the National Natural Science Foundation of China
the Chinese Academy of Sciences
