摘要
ZnO and TiO_(2) 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 TiO_(2) 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.
作者
YUE Xue-Jun
HONG Tian-Sheng
XU Xing
LI Zhen
岳学军;洪添胜;徐兴;李震(Key Laboratory of Key Technology on Agricultural Machine and Equipment(Ministry of Education),College of Engineering,South China Agricultural University,Guangzhou 510642)
基金
by Special Fund for Agro-scientific Research in the Public Interest of China(No 200903023)
Development and Extension of Practical Low-Cost Low-Power Automatic Drip Irrigation Controller(2010GA780046)
Research and Application Demonstration of Orchard Water and Fertilizer Drip Irrigation Controller(2010B020314007).
