Enhanced NO2 sensing performance of ZnO nanowires functionalized with ultra-fine In2O3 nanoparticles
Enhanced NO2 sensing performance of ZnO nanowires functionalized with ultra-fine In2O3 nanoparticles
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超细 In2O3 纳米粒子功能化的 ZnO 纳米线增强了 NO2 传感性能
DOI：
10.1016/j.snb.2020.127729
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发表时间：
2020-04-01
影响因子：
8.4
通讯作者：
Shen, Yansong
中科院分区：
文献类型：
--
作者：
Zhao, Sikai;Shen, Yanbai;Shen, Yansong
传感材料的结构和表面性能被认为是制造金属氧化物半导体气体传感器的主要考虑因素。本研究首次采用简单的水热法合成了具有大长径比的一维ZnO纳米线。然后，在其表面直接生长不同含量的超细In2O3纳米颗粒。结构表征证实了In2O3纳米颗粒的直径仅为3-5 nm，并且在ZnO纳米线表面分散良好。结果表明，在最佳工作温度为150℃时，超细In2O3纳米颗粒对NO2的响应显著提高，当in /Zn摩尔比为5%时，基于In2O3/ZnO复合材料的传感器的最高响应为54.6 ~ 1 ppm NO2，是纯ZnO纳米线的8倍左右。重要的是，对于相对较低的NO2浓度（250 ppb）， in2o3功能化的ZnO纳米线也观察到18.4的高响应。讨论了超细In2O3纳米粒子功能化ZnO纳米线增强NO2传感的机理。
Structure and surface properties of the sensing materials have been recognized as the primary consideration for fabricating metal oxide semiconductor gas sensors. In this study, one-dimensional ZnO nanowires with large length-to-diameter ratio were firstly synthesized by a facile hydrothermal method. Then, different contents of ultra-fine In2O3 nanoparticles were directly grown on their surface. The structural characterization confirmed that the In2O3 nanoparticles were only 3-5 nm in diameter and well dispersed on the surface of ZnO nanowires. The gas sensing results showed that the ultra-fine In2O3 nanoparticles gave rise to a significant improvement in NO2 response at their optimal operating temperature of 150 degrees C. The highest response of 54.6 to 1 ppm NO2 was obtained for the sensor based on In2O3/ZnO composites with the In/Zn molar ratio of 5 %, which was about 8 times higher than that of pure ZnO nanowires. Importantly, a high response of 18.4 to a relatively low NO2 concentration of 250 ppb was also observed for In2O3-functionalized ZnO nanowires. The enhanced NO2 sensing mechanisms of ZnO nanowires functionalized with ultra-fine In2O3 nanoparticles were discussed.