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High-Performance Humidity Sensors Based on Double-Layer ZnO-TiO2 Nanofibers via Electrospinning |
| YUE Xue-Jun, HONG Tian-Sheng**, XU Xing, LI Zhen
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Key Laboratory of Key Technology on Agricultural Machine and Equipment (Ministry of Education), College of Engineering, South China Agricultural University, Guangzhou 510642
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| Cite this article: |
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YUE Xue-Jun, HONG Tian-Sheng, XU Xing et al 2011 Chin. Phys. Lett. 28 090701 |
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Abstract ZnO and TiO2 nanofibers are synthesized via electrospinning methods and characterized by x−ray diffraction, scanning electron microscopy, and transmission electron microscopy. Humidity sensors with double-layer sensing films are fabricated by spinning the ZnO and TiO2 nanofibers on ceramic substrates sequentially. Compared with sensors loading only one type of nanofiber, the double-layer sensors exhibit much better sensing properties. The corresponding impedance changes more than four orders of magnitude within the whole humidity range from 11% to 95% relative humidity, and the response and recovery times are about 11 and 7 s, respectively. Maximum hysteresis is around 1.5% RH, and excellent stability is also observed after 180 days. The humidity sensing mechanism is discussed in terms of the sensor structure. The experimental results provide a possible route for the design and fabrication of high performance humidity sensors based on one-dimensional nanomaterials.
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07.07.Df
82.47.Rs
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Received: 04 March 2011
Published: 30 August 2011
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| PACS: |
07.07.Df
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(Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)
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82.47.Rs
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(Electrochemical sensors)
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