Research on Cataluminescence Type Formaldehyde Sensor Based on CeO2-Co3 O4 Nanofibers
10.11895/j.issn.0253-3820.170221
- VernacularTitle:基于CeO2-Co3O4纳米纤维的催化发光式甲醛传感器研究
- Author:
Jiang Ming HU
1
;
Wang Chun LYU
;
Bin Shi YANG
;
Zhong WANG
Author Information
1. 河南城建学院能源与建筑环境工程学院
- Keywords:
Electrospinning;
Formaldehyde;
Sensor;
Composite nanofibers;
Cataluminescence;
Automotive exhaust
- From:
Chinese Journal of Analytical Chemistry
2017;45(11):1621-1627
- CountryChina
- Language:Chinese
-
Abstract:
CeO2-Co3 O4 composite nanofibers were prepared by the double jets electrospinning method. The nanofibers were then deposited onto the surface of a ω-type heating coil as cataluminescence material to prepare a new cataluminescence ( CTL ) type formaldehyde gas sensor. The crystalline phase and microstructure of CeO2-Co3 O4 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-Co3 O4 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% .
