【作者】：Hongtao Wang, Linsheng Zhou, Yueying Liu, Fengmin Liu*, Xishuang Liang, Fangmeng Liu, Yuan Gao, Xu Yan, Geyu Lu*
【题目】：UV-activated ultrasensitive and fast reversible ppb NO2 sensing based on ZnO nanorod modified by constructing interfacial electric field with In2O3 nanoparticles
【关键词】：ZnO, In2O3, Gas sensor, NO2, UV illumination, Interfacial electric field
【版面信息】：Sensors & Actuators: B. Chemical 305 (2020) 127498
摘要:
The poor recovery characteristic of NO2sensors 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 In2O3nanoparticles 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 NO2at room temperature under ultraviolet (UV) illumination. Even when the concentration of NO2drops 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 NO2and can recover 90 % resistance variation within 31 s. Moreover, the role of photogenerated carriers in NO2sensing process under UV illumination were described in detail.
