Citation: Luo Na, Zhang Bo, Zhang Dan, Xu Jiaqiang. Enhanced CO sensing properties of Pd modified ZnO porous nanosheets[J]. Chinese Chemical Letters, ;2020, 31(8): 2033-2036. doi: 10.1016/j.cclet.2020.01.002 shu

Enhanced CO sensing properties of Pd modified ZnO porous nanosheets

Luo Na ^a ,
Zhang Bo ^b ,
Zhang Dan ^a ,
Xu Jiaqiang ^a,*,

a.
NEST Lab, Department of Chemistry, Department of Physics, College of Science, Shanghai University, Shanghai 200444, China
b.
School of Materials Science and Engineering, Cultivating Base for Key Laboratory of Environment-friendly Inorganic Materials in University of Henan Province, Henan Polytechnic University, Jiaozuo 454000, China

xujiaqiang@shu.edu.cn

Received Date: 29 November 2019
Revised Date: 26 December 2019
Accepted Date: 2 January 2020
Available Online: 3 January 2020

Figures(5)

Noble metal is usually used to improve the gas sensing performance of metal oxide semiconductor (MOS) due to its better catalytic properties. In this work, we reported a synthesis of Pd/ZnO nanocomposite by an in situ reduction with ascorbic acid (AA). It was found that Pd/ZnO sensor has excellent selectivity to CO and the response of the Pd/ZnO sensor towards 100 ppm CO was as high as 15 (R_a/R_g), obviously higher than that of the pristine ZnO sensor (1.4) when the working temperature is 220 ℃. Moreover, the pure ZnO sensor almost has no selectivity to CO, but the Pd/ZnO sensor has excellent selectivity to CO, which may be ascribed to the electronic sensitization of Pd. Our present results demonstrate that the Pd can significantly improve the gas-sensing performance of metal oxide semiconductor and the obtained sensor has great potential in monitoring coal mine gas.
- CO sensor,
- ZnO nanosheet,
- Pd modifying,
- Low concentration,
- Nanocomposite
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