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Journal of Chemistry
Volume 2016 (2016), Article ID 3508307, 6 pages
Research Article

AC Humidity Sensing Properties of Mesoporous K2CO3-SiO2 Composite Materials

1Jilin Provincial Key Laboratory of Architectural Electricity & Comprehensive Energy Saving, Jilin Jianzhu University, Changchun 130118, China
2Department of Basic Science, Jilin Jianzhu University, Changchun 130118, China
3School of Electrical Engineering and Computer, Jilin Jianzhu University, Changchun 130118, China

Received 14 February 2016; Accepted 21 March 2016

Academic Editor: Yves Grohens

Copyright © 2016 Liang Guo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The mesoporous silica SBA-15 and mesoporous K2CO3-SiO2 composite material were synthesized. Characterization of microstructure and morphology of materials indicated that the composite material had saved the porous framework of mesoporous silica SBA-15. Humidity sensing properties of different inverse proportion K2CO3-SiO2 composite material were studied and we found that the sample with 0.16 g/g K2CO3 exhibited excellent linearity in the wide humidity range. The complex impedance changed five orders of magnitude from 11% RH to 95% RH. The rapid response and recovery time were 10 s and 38 s, respectively. Finally a feasible ion transfer mechanism was brought forward to explain the sensing mechanism.