期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 367, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2022.132112
关键词
Metal halide; Lead-free; Humidity sensor; QCM; Respiratory monitoring
资金
- Fundamental Research Funds for the National Key Research and Development Program of China [2018YFB2200500]
- National Natural Science Foundation of China [61975023, 51775070, 22072010, 61875211]
- Fundamental Research Funds for the Central Universities [2021CDJJMRH-012]
- Guangdong Province International Scientific and Technological Cooperation Projects [2020A0505100011]
- CAS Interdisciplinary Innovation Team
- Open Fund of the State Key Laboratory of High Field Laser Physics (Shanghai Institute of Optics and Fine Mechanics)
- Opening Project of State Key Laboratory of Advanced Technology for Float Glass
- State Key laboratory of Advanced Technology for Materials Synthesis and Processing (Wuhan University of Technology) [2021-KF-19]
The lead-free K2CuBr3-based QCM humidity sensor exhibits excellent linear response and stability, making it a promising candidate for real-time breath monitoring.
Halide perovskites have recently emerged as potential humidity-detection materials due to their excellent chemical and physical properties. However, the toxicity of Pb and environmental instability of the lead halide perovskites restrict the application in humidity detection. Herein, a lead-free K2CuBr3 microwires-based quartz crystal microbalance (QCM) humidity sensor was investigated, and the application in human respiratory monitoring was developed. Coupling the high humidity sensitivity of K2CuBr3 with the high mass change sensitivity of QCM, the lead-free K2CuBr3 coated QCM humidity sensor exhibited excellent logarithmic linearity response (R2 = 0.98626, 11-95% RH). In addition, the sensor demonstrated excellent repeatability, fast response/recover time (10.63 s/4.31 s), and considerable stability. Moreover, the Fourier transform infrared spectra (FTIR) and Langmuir adsorption model were applied to reveal the corresponding humidity sensing mechanism. The results indicate the lead-free K2CuBr3-based QCM sensor reported in this work could be a promising candidate for real-time breath monitoring.
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