首页|Specificity of electrophysical and gas-sensitive properties of nanocomposite ZnO-TiO2 films formed by solid-phase pyrolysis
Specificity of electrophysical and gas-sensitive properties of nanocomposite ZnO-TiO2 films formed by solid-phase pyrolysis
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ZnO-TiO2 thin films containing 0.5 mol％,1.0 mol％,and 5.0 mol％ZnO were synthesized by oxidative solid-phase pyrolysis.The materials contained anatase and rutile phases with particle size of 6-13 nm,as confirmed using X-ray phase analysis and scanning electron microscopy.When a certain number of ZnO crystallites appeared in the TiO2 film structure in the temperature range of room temperature to 220 ℃,a two-level response of the film resistance was observed,differing by approximately 10％,as obtained by electrophysical measurements.The two-level response correlates with the formation of two donor energy levels of 0.28 and 0.33 eV in the band structure of the ZnO-TiO2 films.The donor level with a higher activation energy corresponded to the Ti vacancy(V-Ti),and that with a lower activation energy corresponded to the Zn vacancy(V-Zn).Two levels of gas-sensitive properties were noted for 0.5ZnO-TiO2,1ZnO-TiO2,and 5ZnO-TiO2 under the influence of 50 ppm NO2 at 250 ℃.Such two-level responses can be ascribed to the pinning of the Fermi level on ZnO and TiO2 nanocrystallites.The mechanism of the beak-shaped and two-level responses of sensors based on composite nanomaterials when exposed to various gases was elucidated.
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