Abstract
Large-area graphene films, synthesized by the chemical vapor deposition (CVD) method,have the potential to be used as electrodes. However, the electrical properties ofCVD-synthesized graphene films fall short of the best results obtained for graphene filmsprepared by other methods. Therefore, it is important to understand the reason why theseelectrical properties are inferior to improve the applicability of CVD-grown graphene films.Here, we show that CVD-grown graphene films on nickel substrates contain manysmall-base-area (SBA) peaks that scatter conducting electrons, thereby decreasing the Hallmobility of charges in the films. These SBA peaks were induced by small peaks on thenickel surface and are likely composed of amorphous carbon. The formation of these SBApeaks on graphene films was successfully suppressed by controlling the surface morphologyof the nickel substrate. These findings may be useful for the development of a CVDsynthesis method that is capable of producing better quality graphene films with largeareas.
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