Production of H2S gas sensor by a facile fabrication of Au-decorated ZnO

Abstract

H2S is a gas that can cause poisoning with a composition starting from 2.5 ppm. This study investigated the ability of gas sensors to detect H2S gas at below 1 ppm. The primary material used for the gas sensor was ZnO. To increase sensor response, Au was used as a decorated metal. These materials were dissolved using deionized water with ultrasonication and were deposited by solution deposition method onto the Pt electrode. Powder and film characterizations were made using XRD, SEM, and TEM. The characterization results show high crystallinity of the annealed ZnO. The coating material shows a highly porous interconnected structure that can absorb gas quickly. There are Au spots attached to the ZnO particles, which are spherical and homogeneous. Based on these results, the device sensor can detect H2S gas with a high sensing response even at low gas concentration.