Abstract
Nitrogen dioxide (NO2), as a typical threatening atmospheric pollutant, is hazardous to the environment and human health. Thus, the development of a gas sensor with high response and low detection limit for NO2 detection is highly important. The highly ordered mesoporous indium trioxide (In2O3) prepared by simple nanocasting method using mesoporous silica as template and decorated with Au nanoparticles was investigated for NO2 detection. The prepared materials were characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. Characterization results showed that the samples exhibited ordered mesostructure and were successfully decorated with Au. The gas sensing performance of the sensors based on a series of Au-loaded mesoporous In2O3 were systematically investigated. The Au loading level strongly affected the sensing performance toward NO2. The optimal sensor, which was based on 0.5 wt% Au-loaded In2O3, displayed high sensor response and low detection limit of 10 ppb at low operating temperature of 65 °C. The excellent sensing properties were mainly attributed to the ordered mesoporous structure and the catalytic performance of Au. We believe that the Au-loaded mesoporous In2O3 can provide a promising platform for NO2 gas sensors with excellent performance.
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