▎ 摘　　要

Fast and effective picric acid (PA) sensing in water and the air is urgently demanded environmental safety. Herein, a new sensor was designed and synthesized mediated by graphene quantum dots (GQDs) for explosive detection. The luminescent Schiff base-functionalized GQDs (Schiff-GQDs) was immobilized on nanocomposite through in-situ electrospun. The quantitative experiment shows that the fluorescent quantum yield of SchiffGQDs is 11.63%, four times higher than that of N-GQDs (2.71%) and seven times higher than that of dye 1 (1.51%). Luminescent Schiff-GQDs have a bigger quenching percentage, better selective detection of PA where the detection limit is 3.64 x 10-5 M. More importantly, the naked-eye detection limit of the paper-based sensor has been up to 11.45 ng/cm2. Also, theoretical calculation, and proposed mechanism, as well as the host-guest interactions have been carried out for the visual detection of PA. This study can provide a useful example of novel membrane sensors for explosives combining with the two weak luminescent systems based on the molecular design of covalent-nanocomposited emission enhancement (CNEE).