Citation: HU Ming-Jiang, LYU Chun-Wang, YANG Shi-Bin, WANG Zhong. Research on Cataluminescence Type Formaldehyde Sensor Based on CeO2-Co3O4 Nanofibers[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(11): 1621-1627. doi: 10.11895/j.issn.0253-3820.170221
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CeO2-Co3O4 composite nanofibers were prepared by the double jets electrospinning method. The nanofibers were then deposited onto the surface of a μ-type heating coil as cataluminescence material to prepare a new cataluminescence (CTL) type formaldehyde gas sensor. The crystalline phase and microstructure of CeO2-Co3O4 composite nanofibers were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM), and the cataluminescence mechanism and electrochemical characteristic of formaldehyde on the surface of CeO2-Co3O4 nanofibers were analyzed by H2 temperature programmed reduction (H2-TPR) and X-ray photoelectron spectroscopy (XPS). Under the optimal conditions (500 nm of wavelength, 0.2 L/min of flow rate and 550℃), there was a good relationship between the CTL intensity of this formaldehyde gas sensor (Ce30) and formaldehyde concentration in the range of 1.2-50 μg/m3, the sensitivity was 40.04 a.u./(μg/m3), the detection limit was 1.2 μg/m3, the dynamic response time and recover time of formaldehyde gas were 2.4 s and 3.5 s, respectively. The formaldehyde sensor was successfully applied to the determination of formaldehyde in the automotive exhaust, with relative errors of 0.39%-1.07% and relative standard deviations of less than 3%.
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