▎ 摘　　要

We report on an in-situ method for fabricating Cu2O nanospheres decorated with graphene quantum dots (GQDs-Cu2O nanospheres). The material was characterized by transmission electron microscopy, X-ray photoelectron spectroscopy and X-ray diffraction. Further, a novel strategy to amplify the electrochemiluminescence (ECL) signal of luminol system based on the GQDs-Cu2O nanospheres has been investigated. Compared to the use of plain Cu2O nanospheres, the incorporation of GQDs improves the catalytic performance of Cu2O nanospheres towards luminol oxidation effectively. This is attributed to the improved electron transfer capability of GQDs. Compared to the Cu2O nanosphere modified electrode, the ECL intensity of luminol was enhanced 3.5-fold at the GQDs-Cu2O nanosphere modified electrode, with the ECL onset potential negatively shifted by 130 mV. Based on these findings, a method was developed for selective determination of the pesticide pentachlorophenol (PCP) which exerts an inhibition effect on the ECL. The assay displays a linear response in the 0.02 to 300 ng mL(-1) concentration range, with a detection limit of 6.6 pg mL(-1) (at an S/N ratio of 3).