▎ 摘　　要

Multiple face-contact-junction ZnO nanorods (MFCJ ZnO NRs) coated with graphene oxide (GO) sheets have been realized on indium tin oxide substrates. The coated amount and thickness of GO on MFCJ ZnO NRs can be adjusted by electrodeposition time. Photoluminescence (PL) properties of MFCJ ZnO NRs coated with GO sheets are measured and found to be strongly depended on the electrodeposition time of GO sheets. The strongest visible PL emission with the appropriate GO electrodeposition time is observed. We proposed that, in this case, the surface of MFCJ ZnO NRs is coated by very thin GO sheets with ionized oxygen functional species that trap conduction electrons, causing ZnO energy band bending at the surface, which accumulates the surface charges within a very thin surface layer. The charges in surface layer transition to impurities levels cause an enhanced visible PL emission in MFCJ ZnO NRs. (C) 2014 AIP Publishing LLC.