▎ 摘　　要

Graphene quantum dots (GQDs) and GQDs-ZnO composites with different amounts of GQDs have been synthesized via a hydrothermal method. The GQDs were characterized HRTEM and size distribution analyzer. The GQDs-ZnO composites were studied by XRD, SEM, TG, FTIR, Raman and XPS, respectively. The gas sensing properties of GQDs-ZnO composites were investigated. It was found that the amount of GQDs in the composite has great influence on the gas response and gas sensing selectivity of the composite; the sensors based on GQDs-ZnO composites could be operated at room temperature and showed higher response to acetic acid gas than pure ZnO sensor; the sensor based on GQDs-ZnO (S-10) composite could detect 1 ppm acetic acid vapor at room temperature.