Hydrothermal synthesis of ZnO nanotubes for CO gas sensing

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%.

Keywords

• ZnO
• Nanostructures
• Hydrothermal
• CO
• Gas sensor
• Air pollution