Citation:
ZHAO Wei-Jie, ZHAO Hui, HUO Li-hua, GAO Shan. Oxygen-Sensing Properties of La2CuO4 Thick Film[J]. Chinese Journal of Applied Chemistry,
;2007, 24(12): 1409-1413.
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Perovskite-type oxide La2CuO4 was synthesized by the glycine-nitrate process(GNP).The thick film type oxygen-sensing element was fabricated and its oxygen-sensing properties were investigated.The sensitivity of the thick-film La2CuO4 decreased with the increase of the measurement temperature because the oxygen-sensing properties of La2CuO4 was mainly determined by the surface carrier concentration.Oxygen adsorbed on the surface of the La2CuO4 thick films desorbed rapidly with the increase of the measurement temperature,which resulted in decrease of the surface carrier concentration.The highest sensitivity of the thick-film La2CuO4 obtained at 400℃ was 29.6,much higher than that of the sintered bulk ones.The corresponding response time of the thick-film sensors to the change of oxygen partial pressure was about 4 seconds at 400℃.
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Keywords:
- La2CuO4,
- thick film,
- oxygen-sensing property
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