凯发

We design a novel two-stage approach composed of the activation and deposition of amorphous carbon to tune the growth of mono- and bi- layer graphene films. In the two-stage approach, the essential reaction intermediate is -CH3 species which is likely to ascribe to overcome the self-limiting growth regime of graphene on the Cu metal. The catalyst metals used here can be substituted for other ones illustrating the extendibility of the approach. As a comparison, the directly thermal annealing of amorphous carbon fails to grow the graphene, denoting the necessity of designing the two stages. Raman spectra, HR-TEM, SAED, and sheet resistance of graphene films demonstrate that the as-grown mono- and bi- layer graphene films are of high quality, and that the bi- layer graphene film is almost AB stacked. Also, we will present our recent progress on the graphene CH4-CVD growth at very low temperature of 300-400 °C, as well as the electro- and photo- catalytic performance of N-doped CVD-grown graphene and graphene/Cu2O composite.