Development of Ammonia Gas Sensors with PPy Films on Base of Mg₂SiO₄ Porous Ceramics for Better Behavior of Chemo-Electrical Relationship

Abstract:

A new kind of gas sensors were prepared via chemical polymerization of polypyrrole (PPy) as sensitive layer on base of Mg₂SiO₄ porous ceramics. Thermal stability of the PPy sensitive layer was characterized with thermogravimetric analysis, including TG and DTA. Chemical structure of the samples was identified with X-ray diffraction (XRD) analysis. Microstructure of the PPy film was observed by a scanning electron microscope (SEM). Chemo-electrical relationship of the gas sensors was investigated with the resistance variation of PPy films at different gas concentrations. Based on series of experimental results, linear behavior of the chemo-electrical relationship was obtained for the gas sensor, y=0.00344x+1.33754, with R²=0.9734.

• Periodical: Advanced Materials Research (Volumes 760-762)
• Pages: 363-367
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.760-762.363
• Online since: September 2013
• Authors: He Lan Ye, Zhao Xian Xiong, Hao Xue, Hong Qiu, Chun Xiao Song
• Keywords: Chemo-Electrical Relationship, Gas Sensor, Polypyrrole

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