Development of ammonia gas sensors with PPy films on base of Mg2SiO4 porous ceramics for better behavior of chemo-electrical relationship
Ye, He Lan
Xiong, Zhao Xian
Song, Chun Xiao
- 材料学院－会议论文 
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. ? (2013) Trans Tech Publications, Switzerland.