Efficient detection of hazardous H2S gas using multifaceted Co3O4/ZnO hollow nanostructures.

The rapid increases in environmental hazardous gases have laid dangerous effects on human health. The detection of such pollutants gases is mandatory using various optimal techniques. In this paper, porous multifaceted Co3O4/ZnO nanostructures are synthesized by pyrolyzing sacrificial template of core-shell double zeolitic imidazolate frameworks (ZIFs) for gas sensing applications. The fabricated exhibit superior gas sensor response, high selectivity, fast response/recovery times, and remarkable stability and sensitivity to H2S gas. In particular, the multifaceted Co3O4/ZnO nanostructures show a maximum response of 147 at 100 ppm of H2S under optimum conditions. The remarkable gas sensing performances are mainly ascribed to high porosity, wide surface area multifaceted nanostructures, presence of heterojunctions and catalytic activity of ZnO and Co3O4, which are beneficial for H2S gas sensors industry.