Abstract
ZnO–TiO2 nanocomposites were synthesized using a wet chemical route with concentration of 1–10% (w/w) of TiO2 in ZnO. Spin coating was used to deposit the thin films of these nanocomposites on a glass substrate. These nanocomposite thin films were tested for NO2 gas detection at an operating temperature of 250°C in N2 atmosphere (0.4±0.03mbar). The nanocomposite thin film of composition ZnO–2%TiO2 is observed to enhance the NO2 gas detection signal for 20ppm concentration by 22 times in comparison to the pure ZnO thin film. The sensor response of films of the above composition (ZnO–2%TiO2) showed a significant reduction of 68% in the response time and the difference between response and recovery time by 97% for 20ppm of NO2 sensing. The results are analyzed and discussed in the light of data obtained from various characterization techniques e.g. X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), current–voltage (I–V) characteristics and gas sensing characteristics.
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