UV-Enhanced Room Temperature Ozone Sensor Based on Hierarchical SnO2-In2O3

SnO 2-In2O3 hierarchical microspheres were prepared by the hydrothermal and solvothermal method. The morphology, phase crystallinity of the obtained SnO2-In2O3 were measured by X-ray diffraction(XRD), scan electron microscopy(SEM), respectively. A room temperature ozone sensor based on SnO2-In2O3 hierarchical microspheres was fabricated and investigated. The gas sensing properties of the sensor using SnO2-In2O3 strongly depended on the proportion of SnO2 and In2O3. The sensitivity and response/recovery speed were greatly enhanced by UV illumination. A gas sensing mechanism related to oxygen defect was suggested. Keywords Ozone sensor; Hierarchical SnO2-In2O3; UV-Enhanced; Room temperature Article ID 1005-9040(2012)-03-483-05