ZnO Nanoparticles Assisted for CO2 Gas Sensing; Prepared by Solvothermal and Sonochemical Methods

ZnO nanostructures of different methods and sizes were grown in a controlled manner usinga simple hydrothermal and sonochemical technique. Controlling the content of concentration andtemperature of the reaction mixture, spherical nanoparticles ZnO structures could be synthesizedat temperatures 100-150 °C with excellent reproducibility in solvothermal and at different powerand time in sonochemical methods. These ZnO nanostructures have been tested for CO2 gasmonitoring by depositing them as thick films on an interdigitated alumina substrate andevaluating the surface resistance of the deposited layer as a function of operating temperatureand CO2 concentrations. The gas sensitivity tests have demonstrated that the ZnOnanostructures, spherical morphology, exhibit high sensitivity to CO2 proving their applicabilityin gas sensors. The role of the nanostructure on the sensing properties of ZnO is also discussed.

Keywords:

ZnO , Nanoparticles , CO2 , Gas Sensing