Citation:
HUANG Cai-Xia, GAO Guo-Qiang. Catalytic Combustion Type Carbon Monoxide Sensor Based on CuO-Co3O4 Catalyst[J]. Chinese Journal of Inorganic Chemistry,
;2013, 29(6): 1135-1140.
doi:
10.3969/j.issn.1001-4861.2013.00.157
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Composite material CuO-Co3O4 was prepared by a co-precipitation method. A catalytic combustion CO sensor was fabricated by using CuO-Co3O4 as the sensing material and NTCT (Negative Temperature Coefficient Thermistor) as the heating resistance. The limit of quantification for the sensor is 0.034 9 mg·L-1. The phase composition and surface morphology of the composite material were characterized by X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM). When the calcination temperature of CuO-Co3O4 is 400 ℃, the sensor' s sensitivity to CO reaches maximum. The sensor shows good linear relationship between response signals and CO concentration from 0.034 9 to 0.582 mg·L-1 at the operating voltage of 9 V and the linear correlation coefficient is 0.979. The 90% response and recovery time to 0.582 mg·L-1 CO is 24 s and 68 s, respectively.
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