Abstract
Carbon monoxide (CO) gas sensing response of hydrothermally synthesized hexagonal ZnO nanostructures was examined with respect to its morphologies. Synthesized ZnO nanostructures were characterized by X-Ray diffraction (XRD), Field Emission Scanning Electron Microscope (FE-SEM), Energy Dispersive X- Ray Analysis (EDAX) and UV Visible spectroscopic techniques. The CO gas sensing response of ZnO nanostructures were investigated as change in resistance at different gas concentrations of 2, 4, and 6 ppm at room temperature (25 °C). ZnO nanostructures have shown high response to CO concentrations as low as 6 ppm. Response 1.7 s, 2 s and 3 s and recovery time was 2 s, 3 s, 4 s, respectively, for 2, 4 and 6 ppm. Response of the CO gas for ZnO nanostructures at room temperature (25 °C) was 75%.
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