Article ID Journal Published Year Pages File Type
751194 Sensors and Actuators B: Chemical 2010 7 Pages PDF
Abstract

Mesoporous ZnO–SiO2 composites with various Si/Zn molar ratios were synthesized through a simple one-pot sol–gel method and their humidity sensing properties were also examined. Compared with pure SBA-15, ZnO–SiO2 composite shows improved humidity sensing properties and the introducing level of ZnO has a great influence on the humid sensitivity of ZnO–SiO2 composites. The results exhibited that the sample with Si/Zn = 1 showed better humidity sensing properties than others within the range of 11–95% relative humidity (RH). Its impedance changed by more than four orders of magnitude over the whole humidity range. The response and recovery time were about 50 s and 100 s, respectively. High sensitivity and low hysteresis were also observed. A possible mechanism was suggested to explain the humidity sensitive properties.

Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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