Issue

Vol. 15 (2023)

Advances in Noble Metal-Decorated Metal Oxide Nanomaterials for Chemiresistive Gas Sensors: Overview

https://doi.org/10.1007/s40820-023-01047-z
Li‑Yuan Zhu
State Key Laboratory of ASIC and System, Shanghai Institute of Intelligent Electronics and Systems, School of Microelectronics, Fudan University, Shanghai 200433, People’s Republic of China
Lang‑Xi Ou
State Key Laboratory of ASIC and System, Shanghai Institute of Intelligent Electronics and Systems, School of Microelectronics, Fudan University, Shanghai 200433, People’s Republic of China
Li‑Wen Mao
School of Opto‑Electronic Information and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, People’s Republic of China
Xue‑Yan Wu
State Key Laboratory of ASIC and System, Shanghai Institute of Intelligent Electronics and Systems, School of Microelectronics, Fudan University, Shanghai 200433, People’s Republic of China
Yi‑Ping Liu
State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
Hong‑Liang Lu
State Key Laboratory of ASIC and System, Shanghai Institute of Intelligent Electronics and Systems, School of Microelectronics, Fudan University, Shanghai 200433, People’s Republic of China

Corresponding Author: Hong‑Liang Lu

honglianglu@fudan.edu.cn

Nano-Micro Letters, Vol. 15 (2023), Article Number: 89

Abstract

Highly sensitive gas sensors with remarkably low detection limits are attractive for diverse practical application fields including real-time environmental monitoring, exhaled breath diagnosis, and food freshness analysis. Among various chemiresistive sensing materials, noble metal-decorated semiconducting metal oxides (SMOs) have currently aroused extensive attention by virtue of the unique electronic and catalytic properties of noble metals. This review highlights the research progress on the designs and applications of different noble metal-decorated SMOs with diverse nanostructures (e.g., nanoparticles, nanowires, nanorods, nanosheets, nanoflowers, and microspheres) for high-performance gas sensors with higher response, faster response/recovery speed, lower operating temperature, and ultra-low detection limits. The key topics include Pt, Pd, Au, other noble metals (e.g., Ag, Ru, and Rh.), and bimetals-decorated SMOs containing ZnO, SnO2, WO3, other SMOs (e.g., In2O3, Fe2O3, and CuO), and heterostructured SMOs. In addition to conventional devices, the innovative applications like photo-assisted room temperature gas sensors and mechanically flexible smart wearable devices are also discussed. Moreover, the relevant mechanisms for the sensing performance improvement caused by noble metal decoration, including the electronic sensitization effect and the chemical sensitization effect, have also been summarized in detail. Finally, major challenges and future perspectives towards noble metal-decorated SMOs-based chemiresistive gas sensors are proposed.


Highlights:


1 Recent progress in noble metal-decorated (NM-D) semiconducting metal oxides (SMOs) gas sensors are summarized.
2 Gas sensing mechanisms related to noble metal decoration are carefully discussed.
3 Crucial challenges facing the development of NM-D SMOs gas sensors are analyzed.

Keywords

Noble metal Bimetal Semiconducting metal oxide Chemiresistive gas sensor Electronic sensitization Chemical sensitization
Zhu, Li‑Yuan, Lang‑Xi Ou, Li‑Wen Mao, Xue‑Yan Wu, Yi‑Ping Liu, and Hong‑Liang Lu. 2023. “Advances in Noble Metal-Decorated Metal Oxide Nanomaterials for Chemiresistive Gas Sensors: Overview”. Nano-Micro Letters 15 (April):89. https://doi.org/10.1007/s40820-023-01047-z.
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