Abstract
The poor recovery characteristic of NO2 sensors operated at room temperature is always a challenge to solve. In order to realize the combination of ultra-high response and fast response and recovery speed, heterogeneous interfacial electric fields are constructed by loading In2O3 nanoparticles on ZnO nanorods, which possess fast charge transfer ability, to improve the separation efficiency of photogenerated carriers. The sensing results show that 10 mol% In2O3-decorated ZnO (In: Zn) exhibits a response of 117.0 to 700 ppb NO2 at room temperature under ultraviolet (UV) illumination. Even when the concentration of NO2 drops down to 50 ppb, the response also can reach 1.5. In addition, the sensor's response time is 100 s when exposed to 700 ppb NO2 and can recover 90 % resistance variation within 31 s. Moreover, the role of photogenerated carriers in NO2 sensing process under UV illumination were described in detail.
Published Version
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