▎ 摘　　要

Ultra-small ZnO nanodots@functionalized graphene sheets (ZnO@FGS) nanocomposites were synthesized by directly growing ZnO nanodots on FGS via microwave irradiation. Zn2+ ties to FGS with oxygen-contained groups, which makes reaction start and ZnO nanodots form on FGS. The X-ray diffraction pattern reveals that wurtzite structure of ZnO is obtained. The scanning electron microscopy and transmission electron microscopy results demonstrate ZnO nanodots homogeneous dispersed on FGS. Photoluminescence spectra shows the surface defects of ZnO related emissions are quenched in the composites and the combination of graphene sheets on ZnO can apparently decrease the recombination possibility of photo-generated carries as well. The ZnO nanodots are dispersed well on FGS, which guarantees the superior optoelectronic properties of ZnO@FGS nanocomposites. Compared with ZnO, the ZnO@FGS nanocomposites show enhanced-UV photocatalytic activity for the degradation of Rhodamine B. The superior photocatalytic activity of ZnO@FGS nanocomposites is attributed to the electronic interaction between ZnO and FGS.