Citation: Ding Pei, Xu Dongsheng, Dong Nan, Chen Ying, Xu Pengcheng, Zheng Dan, Li Xinxin. A high-sensitivity H₂S gas sensor based on optimized ZnO-ZnS nano-heterojunction sensing material[J]. Chinese Chemical Letters, ;2020, 31(8): 2050-2054. doi: 10.1016/j.cclet.2019.11.024 shu

A high-sensitivity H₂S gas sensor based on optimized ZnO-ZnS nano-heterojunction sensing material

Ding Pei ^a ,
Xu Dongsheng ^a,b ,
Dong Nan ^a ,
Chen Ying ^b ,
Xu Pengcheng ^b ,
Zheng Dan ^a,*, ,
Li Xinxin ^b

a.
School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China
b.
State Key Lab of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China

zhengdan@sit.edu.cn

Received Date: 11 October 2019
Revised Date: 12 November 2019
Accepted Date: 13 November 2019
Available Online: 16 November 2019

Figures(7)

This paper reports a high-performance H₂S gas sensing material that is made of ZnO nanowires (NWs) modified by an optimal amount of ZnS to form nano-heterojunctions. Compared with the intrinsic ZnONWs, the three differently modified nano-heterostructure material ZnO-ZnS-x (x=5, 10, 15) shows significant improvement in sensing performance to H₂S at the working temperatures of 100 400 ℃, especially in the low temperature range (< 300 ℃). The chemiresistive sensor with ZnO-ZnS-10 sensingmaterial exhibits the largest response signal to H₂S among all the other ZnO-ZnS-x (x=5, 10, 15, 20) sensors. Its response signal to 5 ppm H₂S at 150 ℃ is about 2.7 times to that of the ZnO-NWs sensor. Besides, the ZnO-ZnS-10 sensor also features satisfactory selectivity and repeatability at 150 ℃. With the technical advantage attributed to the reduction of the redesigned band gap at the interface between ZnO and ZnS, the ZnO-ZnS heterostructure sensor rather than the traditional ZnO-NWs sensor can be used for high-sensitivity application at low working temperature.
- ZnO-ZnS heterojunction,
- Hydrogen sulfide,
- Gas sensor,
- Sensitivity detection,
- Selectivity,
- Band gap
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A high-sensitivity H₂S gas sensor based on optimized ZnO-ZnS nano-heterojunction sensing material