湿度
相对湿度
卤化物
材料科学
磁滞
重复性
钙钛矿(结构)
纳米技术
化学工程
化学
无机化学
结晶学
气象学
色谱法
工程类
物理
量子力学
作者
Yanyi Huang,Chengyao Liang,Daofu Wu,Qijie Chang,Libo Liu,Huanbin Liu,Xiaosheng Tang,Yong He,Jing Qiu
标识
DOI:10.1021/acs.jpclett.1c00559
摘要
Halide perovskites are potential humidity-detection materials due to their sensitivity to water, but the instability of traditional lead-based halide perovskites and the toxicity of Pb hinder further application in humidity sensing. Here, lead-free Cs3Cu2Br5 perovskite microcrystals passivated by surface ligands (OLA and OAm) are used to prepare an environmentally friendly humidity sensor. The humidity sensing performance of the prepared sensors was tested, and the effect of surface ligands of perovskites on the performance of humidity sensors was analyzed. The results show that the impedance variations of the manufactured humidity sensors at 12 to 95% relative humidity are 106Ω (OLA) and 105Ω (OAm), respectively. Besides, the sensors demonstrated excellent repeatability, low hysteresis, and considerable stability at different RH values. Furthermore, the analysis of the different ligands attests that short-chain OLA is more conducive to the formation of porous films with stronger water absorption capacity, further improving the responsiveness of the sensor. By contrast, and long-chain OAm is more conducive to the formation of dense films, improving the response ability at low humidity. Additionally, the more hydrophilic OLA contributes to greater responsiveness, while the more hydrophobic OAm helps to shorten the response and recovery time.
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