Abstract
Nanostructured copper oxide (CuO) thin films were prepared by spray pyrolysis technique. X-ray diffraction was used to investigate the structural properties. Surface morphology was studied using scanning electron microscopy. Microstructure was studied using a transmission electron microscope, and energy-dispersive X-ray analysis was used to determine the elemental composition of prepared nanostructured CuO thin film. Gas-sensing performance was conducted using static gas-sensing system, at different operating temperatures in the range of 200°C to 400°C for the gas concentration of 100 ppm. The maximum sensitivity (S = 872) to H2S was found at the temperature of 250°C. Quick response (2 s) and fast recovery (5 s) are the main features of this film.
Highlights
Metal-oxide semiconductor chemical sensors have been a subject of intensive research due to their industrial and domestic applications in toxic and flammable gas detection
Copper oxide has been employed in heterogeneous catalysis for several environmental processes as well as in the production of gas-sensing devices, owing to the conductivity changes induced by the reaction of gases with surface-adsorbed oxygen
Structural properties The structural characterization of nanostructured CuO thin films was made by X-ray diffraction technique with monochromatic CuKα radiation, λ = 1.5418Å
Summary
Metal-oxide semiconductor chemical sensors have been a subject of intensive research due to their industrial and domestic applications in toxic and flammable gas detection. Copper oxide has been employed in heterogeneous catalysis for several environmental processes as well as in the production of gas-sensing devices, owing to the conductivity changes induced by the reaction of gases with surface-adsorbed oxygen. Hydrogen sulfide (H2S) is a toxic and inflammable gas, produced in sewage plants, coal mines, and oil and natural gas industries. It is used in large amounts in various chemical industries, research laboratories, and as a process gas in the production of heavy water [8]
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