Highly Sensitive and Selective Sensing of H2S Gas Using Precipitation and Impregnation-Made CuO/SnO2 Thick Films

Abstract In this work, CuO-loaded tetragonal SnO 2 nanoparticles (CuO/SnO NPs) were synthesized using precipitation/impregnation methods with varying Cu contents of 0–25 wt% and characterized for H S detection. The material phase, morphology, chemical composition, specific surface area NPs evaluated X-ray diffraction, transmission electron microscopy, scanning energy-dispersive spectroscopy, photoelectron Brunauer–Emmett–Teller analysis. From gas-sensing data, the responses greatly enhanced by CuO loading particularly at optimal content 20 wt%. CuO/SnO sensor showed an excellent response 1.36 × 10 5 toward ppm high selectivity against , SO CH 4 C a low optimum working temperature 200 °C. addition, provided fast detection limit less than 0.15 ppm. CuO–SnO could therefore be potential candidate in environmental applications.