Abstract
This review presents a comprehensive summary of the development of strategies for H2S recognition, which utilizes metal oxides (including CuO, SnO2, ZnO, Fe2O3, WO3, In2O3, BeO, NiO, and heterojunction) and metal salt nanostructures (including Fe-2(MoO4)(3) nanorods and beta-AgVO3 nanowires) as the sensing materials. These sensors are based primarily on a conductivity response to H2S. The sensing mechanism and performance of these systems are described in this review, and prospective development of sensors employing optical signals based on these materials is presented. In addition, the barriers and challenges in developing this system are also proposed. It is anticipated that excellent stability, high sensitivity, and easy detection under extreme conditions can be achieved with these systems.