Abstract
CeO2–NiO composites were prepared by a simple grind method followed by a heat-treatment process and characterized by X-ray diffraction, transmission electron microscope and nitrogen adsorption–desorption test. Humidity sensing properties of CeO2–NiO composites with different mass ratios were studied. The optimal result was obtained for the sample with CeO2–NiO mass ratio of 0.5. The impedance of the sensor changes more than five orders of magnitude within the humidity range from 11 to 95 % relative humidity (RH) at 100 Hz. The response and recovery time are about 3 and 19 s respectively, and the maximum hysteresis is <2 % RH. The results indicate the potential applications of CeO2–NiO composite (CeO2–NiO mass ratio of 0.5) for fabricating high performance humidity sensors.
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