湿度
相对湿度
小气候
蒸腾作用
水蒸气
卤化物
水分
材料科学
环境科学
重复性
湿度计
介电谱
复合材料
化学
气象学
地理
考古
物理化学
生物化学
无机化学
光合作用
电化学
色谱法
电极
作者
Chengyao Liang,Yanyi Huang,Yijie Shi,Daofu Wu,Qijie Chang,Bingsheng Du,Xuezheng Guo,Delin Kuang,Zhilin Wu,Chengjiu Zhao,Xiaosheng Tang,Jing Qiu,Yong He
标识
DOI:10.1021/acsaelm.1c01275
摘要
A suitable humidity environment is of great significance to the healthy and comfortable life of urban residents, and the humidification effect of street trees is crucial for effectively regulating microclimates in big cities. Therefore, evaluating the humidification capacity among species is a rewarding research aiming at providing bases for selecting appropriate street tree species. The leaves of trees generate water vapor through transpiration to slowly increase the environmental humidity, and humidity sensors with giant response, excellent linearity, and reliable repeatability are more conducive to analyzing and evaluating the subtle process in detail. Here, the antisolvent method was adopted to simplify the synthesis process of lead-free K2CuBr3, and the fabricated impedance-type humidity sensor based on K2CuBr3 microrods satisfied these requirements. The all-inorganic lead-free halide K2CuBr3 overcomes two drawbacks, including the toxicity of Pb and the moisture instability of most reported halide perovskites used in the field of humidity sensing. The impedance variation exceeds 106 Ω (162 Ω to 182 MΩ), with the relative humidity varying from 12 to 95%. In addition, the analysis of the corresponding complex impedance spectroscopy revealed the sensing mechanism. The intrinsic properties of K2CuBr3 are reflected at low humidity, and the proton transfer gradually dominates the sensing paths with increasing humidity. Furthermore, the K2CuBr3 humidity-sensitive layer is employed to evaluate the transpiration of street trees for the first time, and the successful evaluation of the humidification effect indicates more applications of lead-free halides.
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