石墨烯下铜衬底的氧化及其应用

Graphene with unique physical, chemical properties provides new anti-corrosion opportunities for metals. We studied the oxidation of copper substrates under graphene by Raman spectroscopy and low energy electron diffraction. Graphene can prevent the Cu substrates from oxidation for a prolonged period. The oxidation rate of the substrate is affected by many factors, including the number of graphene layers, the defect density of graphene, and the facet orientation of the copper substrate. After the substrate is oxidized, the coupling efficiency of light and the sample is greatly improved. The measuered responsivity of such a graphene / Cu₂O photodetector is 115.7 mA / W, much higher than that of pure graphene photodetectors. This research opens the way for transfer-free graphene devices.