▎ 摘　　要

Graphene quantum dots (GQDs) have attracted significant interest for the design of fluorescence sensors. Hydrogen peroxide (H2O2) participates in human metabolism and is widely used in chemical and food industries. Therefore, the effective detection of H2O2 is highly desirable. Herein, an effective sensing platform is proposed for the direct detection of H2O2 using sulfur-doped GQDs (S-GQDs) as novel fluorescent probes. The S-GQDs were prepared using a nanospace-confined strategy, in which sulfur-doped carbon nanolayers were cut into S-GQDs using sulfuric and acetic acids in the mesoporous space of silica SBA-15. Based on the excellent dispersibility, high photostability, and abundant oxygen/sulfur functional groups of S-GQDs, an effective fluorescence sensor was developed for the direct detection of H2O2 without the aid of a third party. The developed sensor could be used with real samples for H2O2 detection. This paper proposes a novel method of exploiting GQDs for the direct detection of molecules.