A surface acoustic wave humidity sensor with high sensitivity based on electrospun MWCNT/Nafion nanofiber films |
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Authors: | Sheng Lei Dajing Chen Yuquan Chen |
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Affiliation: | Department of Biomedical Engineering, Zhejiang University, Hangzhou, People's Republic of China. thunder@zju.edu.cn |
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Abstract: | Humidity detection has been widely used in a variety of fields. A humidity sensor with high sensitivity is reported in this paper. A surface acoustic wave resonator (SAWR) with high resonance frequency was fabricated as a basic sensitive component. Various nanotechnologies were used to improve the sensor's performance. A multi-walled carbon nanotube/Nafion (MWCNT/Nafion) composite material was prepared as humidity-sensitive films, deposited on the surface of an SAWR by the electrospinning method. The electrospun MWCNT/Nafion nanofiber films showed a three-dimensional (3D) porous structure, which was profitable for improving the sensor's performance. The new nano-water-channel model of Nafion was also applied in the humidity sensing process. Compared to other research, the present sensor showed excellent sensitivity (above 400 kHz/% relative humidity (RH) in the range from 10% RH to 80% RH), good linearity (R(2) > 0.98) and a short response time (~3 s@63%). |
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