材料科学
煅烧
介孔材料
吸附
检出限
扩散
比表面积
氧传感器
空位缺陷
氧气
纳米技术
化学工程
水分
复合材料
化学
色谱法
催化作用
生物化学
物理
有机化学
工程类
热力学
结晶学
作者
Cheng Li,Yuan-Yuan Sun,Yanan Li,Xian‐Fa Zhang,Zhao‐Peng Deng,Li-Hua Huo,Yingming Xu,Shan Gao
标识
DOI:10.1016/j.snb.2023.133838
摘要
Herein, we reported a low-cost ZnO biomorphic material used for low-temperature and high sensing detection of trace NO2. It was simply prepared by calcining Zn(NO3)2 solution soaked waste chestnut mesocarp biotemplate at 600 °C in air for the first time. The morphology of ZnO-6 material displays one-dimensional (1D) tubular structure assembled from uniform nanoparticles, and it has small mesopore distribution, relatively large specific surface area and abundant oxygen vacancy defects. The synergy of above advantageous factors provides a convenient channel for gas diffusion, and increases the surface active sites for adsorption and chemical reactions, which in turn efficiently enhances sensing performance of ZnO material towards NO2. At 92 °C, ZnO-6 sensor achieves a high response of 365 towards 10 ppm NO2, which is 30.4 times than that (S = 12) of template-free ZnO-0 sample. Also, it is larger than most reported 1D ZnO-based NO2 sensors. This sensor still possesses fast recovery characteristic, low detection limit, and good moisture tolerance. Moreover, the improved NO2 gas-sensing mechanism is discussed in more detail.
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