▎ 摘　　要

Nitrogen-doped graphene quantum dots (NGQDs) were synthesized by hydrothermal method with citric acid and ammonia as raw materials. A solid-state electrochemiluminescence (ECL) sensor was thus constructed by dropping NGQDs/CdS nanocluster (NCs) composites. The properties of NGQDs and CdS NCs were characterized by UV-Vis absorption spectroscopy and fluorescence spectroscopy. The electrochemiluminescent and electrochemical behaviors of the sensor were studied. The results showed that NGQDs could enhance electrochemiluminescence signal of CdS NCs and the stability of NGQDs/CdS NCs increased when H2S was used as the co-reaction reagent of CdS NCs. In the presence of H2S, S(2-)bonded with excess Cd2+, and the ECL intensity decreased. Under the optimal conditions, the decrease in electrochemiluminescence intensity varied proportionally with the logarithmic concentration of H2S from 2.0x10(-10)-2.0x10(-5) mol/L, and the detection limit was estimated to be 6.7x10(-11) mol/L. The sensor was used for the determination of H2S in bovine serum with recoveries of 92.7% - 103.8%, which indicated that the proposed sensor had the potential for detection of H2S in practical complex samples.