Highly sensitive and selective H 2 S chemical sensor based on ZnO nanomaterial

Abstract

ZnO is worth evaluating for chemical sensing due to its outstanding physical and chemical properties. We report the fabrication and study of the gas sensing properties of ZnO nanomaterial for the detection of hydrogen sulfide (H 2 S). This prepared material exhibited a 7400 gas sensing response when exposed to 30 ppm of H 2 S in air. In addition, the structure showed a high selectivity towards H 2 S against other reducing gases. The high sensing performance of the structure was attributed to its nanoscale size, morphology and the disparity in the sensing mechanism between the H 2 S and other reducing gases. We suggest that the work reported here including the simplicity of device fabrication is a significant step toward the application of ZnO nanomaterials in chemical gas sensing systems for the real-time detection of H 2 S.