Humidity Sensing Property of Al-Doped Mesoporous Silica

Abstract:

In order to study the humidity sensing property and sensing mechanism of Al-doped mesoporous silica SBA-15 (Al-SBA-15), Al-SBA-15 was prepared by a simple grind method following a heat-treatment process. Its structure and morphology was characterized by X-ray diffraction (XRD), Infrared (IR), scanning electron microscope (SEM). Humidity sensing response was studied and the results indicated that Al-SBA-15 displayed better sensing property when the frequency was 100 Hz. The impedance of Al-SBA-15 changes three orders of magnitude when relative humidity changes from 11% to 95%. Complex impedance spectra, the corresponding equivalent circuit under different relative humidity are carefully analyzed to explore the humidity sensing mechanism of this material. This material can be used as a promising humidity sensing material.

• Periodical: Applied Mechanics and Materials (Volumes 249-250)
• Pages: 992-997
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.249-250.992
• Online since: December 2012
• Authors: Wang Chang Geng, Li Bing Duan, Qiu Yu Zhang
• Keywords: Complex Impedance Spectra, Humidity Sensing, Mesoporous Silica

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