Enhanced CO sensing properties of Pd modified ZnO porous nanosheets

• Published in: Chinese chemical letters Vol. 31; no. 8; pp. 2033 - 2036
• Main Authors: Luo, Na, Zhang, Bo, Zhang, Dan, Xu, Jiaqiang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2020; NEST Lab, Department of Chemistry, Department of Physics, College of Science, Shanghai University, Shanghai 200444, China%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
• Subjects: CO sensor; Low concentration; Nanocomposite; Pd modifying; ZnO nanosheet; Nanocomposite; CO sensor; Pd modifying; ZnO nanosheet; Low concentration
• ISSN: 1001-8417; 1878-5964
• DOI: 10.1016/j.cclet.2020.01.002

The 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 (Ra/Rg), obviously higher than that of the pristine ZnO sensor (1.4) when the optical working temperature is 220 °C. [Display omitted] 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 (Ra/Rg), obviously higher than that of the pristine ZnO sensor (1.4) when the working temperature is 220 °C. 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.