Influence of Different Pt Functionalization Modes on the Properties of CuO Gas-Sensing Materials

Xiangxiang Chen; Tianhao Liu; Yunfei Ouyang; Shiyi Huang; Zhaoyang Zhang; Fangzheng Liu; Lu Qiu; Chicheng Wang; Xincheng Lin; Junyan Chen; Yanbai Shen

doi:10.3390/s24010120

Sensors (Dec 2023)

Influence of Different Pt Functionalization Modes on the Properties of CuO Gas-Sensing Materials

Xiangxiang Chen,
Tianhao Liu,
Yunfei Ouyang,
Shiyi Huang,
Zhaoyang Zhang,
Fangzheng Liu,
Lu Qiu,
Chicheng Wang,
Xincheng Lin,
Junyan Chen,
Yanbai Shen

Affiliations

Xiangxiang Chen: Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China
Tianhao Liu: Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China
Yunfei Ouyang: Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China
Shiyi Huang: Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China
Zhaoyang Zhang: Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China
Fangzheng Liu: Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China
Lu Qiu: Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China
Chicheng Wang: Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China
Xincheng Lin: Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China
Junyan Chen: Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China
Yanbai Shen: School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China

DOI: https://doi.org/10.3390/s24010120
Journal volume & issue: Vol. 24, no. 1
p. 120

Abstract

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The functionalization of noble metals is an effective approach to lowering the sensing temperature and improving the sensitivity of metal oxide semiconductor (MOS)-based gas sensors. However, there is a dearth of comparative analyses regarding the differences in sensitization mechanisms between the two functionalization modes of noble metal loading and doping. In this investigation, we synthesized Pt-doped CuO gas-sensing materials using a one-pot hydrothermal method. And for Pt-loaded CuO, Pt was deposited on the synthesized pristine CuO surface by using a dipping method. We found that both functionalization methods can considerably enhance the response and selectivity of CuO toward NO2 at low temperatures. However, we observed that CuO with Pt loading had superior sensing performance at 25 °C, while CuO with Pt doping showed more substantial response changes with an increase in the operating temperature. This is mainly due to the different dominant roles of electron sensitization and chemical sensitization resulting from the different forms of Pt present in different functionalization modes. For Pt doping, electron sensitization is stronger, and for Pt loading, chemical sensitization is stronger. The results of this study present innovative ideas for understanding the optimization of noble metal functionalization for the gas-sensing performance of metal oxide semiconductors.

Published in Sensors

ISSN: 1424-8220 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Chemical technology
Website: http://www.mdpi.com/journal/sensors

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