Carboxymethyl cellulose-MgCl2 composite based humidity sensor: Self-powered, flexible, and multifunctional sensing applications

被引：0
|
作者：
Wang, Haoxiang [1 ,2 ]
Tang, Chengli [1 ]
机构：
[1] School of Information Science and Engineering, Jiaxing University, Jiaxing,314001, China
[2] College of Mechanical Engineering, Zhejiang Sci-Tech University, Hangzhou,310018, China
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2024年 / 41卷 / 11期
关键词：
Humidity sensors have been widely used in fields of agriculture; industrial production; precision instruments and human health monitoring. To address the problem that humidity sensors need to be driven by an external power source; a self-powered flexible humidity sensor based on the principle of primary battery was proposed in this paper. The carboxymethyl cellulose with moisture-sensitive properties and MgCl2 with moisture-absorbent properties were applied as the sensitive layer. And commercialized conductive copper and nickel adhesive tapes were used as the positive and negative electrodes. The micro-morphology and surface elements of the sensitive layer of the sensor were characterized by SEM and EDS; the moisture sensitivity mechanism was analyzed based on complex impedance spectroscopy; and the multifunctional applications of the sensor was demonstrated. The sensor sensitive layer has good hydrophilicity; which can ionize the MgCl2 in it to produce carriers such as Mg2+ and Cl− after contacting the water molecules in the environment. The directional movement of these carriers can generate output voltage. The response value can reach 201% when the relative humidity changes from 11% to 95%. The sensor can be used for human respiratory frequency and characteristic detection; soil moisture and urinary moisture detection; finger distance detection; and providing electrical energy. Experimental results show its potential for applications in health monitoring; environmental humidity monitoring; non-contact switching; and power-supply areas. © 2024 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved;
D O I：
10.13801/j.cnki.fhclxb.20240022.004
中图分类号：
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页码：6045 / 6054
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