Enhanced oxygen anions generation on BiS/SbS heterostructure by visible light for trace HS detection at room temperature.

Bismuth sulfide (BiS) possesses unique properties that make it a promising material for effective hydrogen sulfide (HS) detection at room temperature. However, when exposed to light, the oxygen anions (O) adsorbed on the surface of BiS can react with photoinduced holes, ultimately reducing the ability to respond to HS. In this study, BiS/SbS heterostructures were synthesized, producing photoinduced oxygen anions (O) under visible light conditions, resulting in enhanced HS sensing capability. The BiS/SbS heterostructure sensor exhibits a two-fold increase in sensing response to 500 ppb HS under in door light conditions relative to its performance in darkness. Additionally, the sensing response of the BiS/SbS sensor (R/R= 23.3) was approximately five times higher than pure BiS. The improved sensing performance of the BiS/SbS heterostructures is attributable to the synergistic influence of the heterostructure configuration and light modulation, which enhances the HS sensing performance by facilitating rapid charge transfer and increasing active sites (O) when exposed to visible light.