AC Humidity Sensing Properties of Mesoporous K2CO3-SiO2 Composite Materials

作者：Guo Liang; Chu Xuefeng; Gao Xiaohong; Wang Chao; Chi Yaodan; Yang Xiaotian

来源：Journal of Chemistry, 2016, 2016: 3508307.

DOI：10.1155/2016/3508307

<jats:p>The mesoporous silica SBA-15 and mesoporous K<jats:sub>2</jats:sub>CO<jats:sub>3</jats:sub>-SiO<jats:sub>2</jats:sub>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 K<jats:sub>2</jats:sub>CO<jats:sub>3</jats:sub>-SiO<jats:sub>2</jats:sub>composite material were studied and we found that the sample with 0.16 g/g K<jats:sub>2</jats:sub>CO<jats:sub>3</jats:sub>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.</jats:p>

• 出版日期2016