▎ 摘　　要

Sulfur dioxide (SO2) is a major air pollutant; therefore, its detection is critical for pollution prevention and administration. Graphene has shown great potential for SO2 detection due to its applications in other gas-sensing techniques. In this study, both nitrogen doping and blue-light irradiation were found to improve the sensitivity of the graphene-based SO2 sensors by 91% and 88%, respectively. The response time of the sensor was reduced by more than 30%. Density functional theory (DFT) calculations indicated a strong interaction between SO2 and nitrogen-doped graphene, which accounted for the higher sensitivity of the nitrogen-doped graphene sensors. Analyses on the light irradiation of the sensor showed that the increased number of adsorption sites and trap -regulated carrier kinetics were essential for the enhancement of the SO2 sensitivity.