Chin. Phys. Lett.  2011, Vol. 28 Issue (9): 090701    DOI: 10.1088/0256-307X/28/9/090701
GENERAL |
High-Performance Humidity Sensors Based on Double-Layer ZnO-TiO2 Nanofibers via Electrospinning
YUE Xue-Jun, HONG Tian-Sheng**, XU Xing, LI Zhen
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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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.
Keywords: 07.07.Df      82.47.Rs     
Received: 04 March 2011      Published: 30 August 2011
PACS:  07.07.Df (Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)  
  82.47.Rs (Electrochemical sensors)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/28/9/090701       OR      https://cpl.iphy.ac.cn/Y2011/V28/I9/090701
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YUE Xue-Jun
HONG Tian-Sheng
XU Xing
LI Zhen
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