氧分壓影響SnO2氣敏傳感器響應(yīng)的機理
THE MECHANISM FOR THE EFFECT OF OXYGEN PARTIAL PRESSURE ON THE RESPONSE OF GAS SENSORS BASED ON SnO2
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摘要: 本文報道了一種SnO2氣敏傳感器敏感機理的新模型。SnO2晶粒表面勢壘由3個過程控制:(1)氧吸附(作電子受主)和脫附,(2)還原性氣體吸附(作電子施主)和脫附,(3)表面氧化還原反應(yīng)。據(jù)此可以很好地解釋實驗中發(fā)現(xiàn)的氧分壓對氣敏傳感器響應(yīng)的影響。
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關(guān)鍵詞:
- SnO2傳感器; 表面勢壘; 還原性氣體; 電子施主; 氧分壓
Abstract: A new model for gas sensors based on SnO2 is developed. The surface potential height of the SnO2 grains is controlled by: (1) Oxygen adsorption (as electron acceptor) and desorption, (2) reducing gas adsorption (as electron donor) and desorption, (3) oxidation-reduction reaction in the surface phase. The effect of oxygen partial pressure on the response of gas gensors, observed by G. Coles et al., (1991) can be well explained. -
G. Coles et al.. Sensors and Actuarors, B4 (1991)3-4, 485-491.[2]G. Coles et al., J. Phys. D, Appl. Phys., 24(1991)4, 633-641.[3]P. Clifford et al, Proc. Int. Meet, on Chemical Sensors, Fukuoka, Japan, (1983), 135-146.[4]吉林大學(xué)化學(xué)系,催化作用基礎(chǔ),科學(xué)出版社,1980年,第1-30頁.[5]S. Morrison 著,趙壁英等譯,表面化學(xué)物理,北京大學(xué)出版社,北京,1984年,第36頁.[6]S. Morrison, Surface Science, 27(1971)3, 586-604. -
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