Citation: HU Ming-Jiang, WANG Zhong. Research on Thin Film type Hydrogen Sulfide Sensor Based on SnO₂-CuO Nanofibers[J]. Chinese Journal of Analytical Chemistry, ;2016, 44(9): 1315-1321. doi: 10.11895/j.issn.0253-3820.160166 shu

Research on Thin Film type Hydrogen Sulfide Sensor Based on SnO₂-CuO Nanofibers

HU Ming-Jiang ^1, ,
WANG Zhong ²

1.
School of Energy and Building Environmental Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
2.
School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China

Received Date: 8 March 2016
Revised Date: 13 May 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 51376083) and the Educational Commission of He'nan Province of China (No. 15A470006)

Figures(8)

A SnO₂-CuO composite nanofiber was prepared by the coaxial electrospinning method. A new thin-film-type hydrogen sulfide gas sensor was designed by coating SnO₂-CuO composite nanofibers onto an alumina ceramic tube with Au electrodes by dip-coating method. The crystalline phase and microstructure of SnO₂-CuO composite nanofibers were characterized using X-ray diffraction (XRD) and scanning electron microscope (SEM). The influence of chemical composition and thickness of sensitive film on the sensitive mechanism and electrochemical characteristic of SnO₂-CuO nanofibers were analyzed. The characteristic tests of hydrogen sulfide sensor including sensitive performance, temperature, relative humidity, dynamic response, interference and stability were carried out by WS-30A type multifunction analyzer in gas sensor test system. The results demonstrated that, when the operating temperature was 25℃ and hydrogen sulfide gas concentration increased from 10 to 60 mg/L, the hydrogen sulfide sensor based on C50 composite nanofibers with 70 nm sensitive film thickness had the best linearity (92.3%) and sensitivity (98.2%). Besides, its highest response values and relatively humidity level were 1080 and 95%, respectively, and its dynamic response time and recover time were 4 s and 12 s, respectively. This sensor showed good anti-disturbance to the gases, such as CO, NO₂, SO₂, NH₃, CO₂, CH₄ and H₂. The response value of the sensor was attenuated about 9.2% when it was applied continually in the mine about 12 months, and its normal response time was 10.9 months.
- Coaxial electrospinning,
- Hydrogen sulfide,
- Sensor,
- Composite nanofibers,
- Sensitive thin film
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Research on Thin Film type Hydrogen Sulfide Sensor Based on SnO₂-CuO Nanofibers