Zhu Li-Yuan, Ou Lang-Xi, Mao Li-Wen, Wu Xue-Yan, Liu Yi-Ping, Lu Hong-Liang
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.
School of Opto-Electronic Information and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, People's Republic of China.
Nanomicro Lett. 2023 Apr 7;15(1):89. doi: 10.1007/s40820-023-01047-z.
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, SnO, WO, other SMOs (e.g., InO, FeO, 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.
具有极低检测限的高灵敏度气体传感器在包括实时环境监测、呼气诊断和食品新鲜度分析等多种实际应用领域中具有吸引力。在各种化学电阻传感材料中，贵金属修饰的半导体金属氧化物（SMOs）目前因其独特的电子和催化性能而引起了广泛关注。本文综述了不同纳米结构（如纳米颗粒、纳米线、纳米棒、纳米片、纳米花和微球）的贵金属修饰SMOs在高性能气体传感器设计和应用方面的研究进展，这些传感器具有更高的响应、更快的响应/恢复速度、更低的工作温度和超低检测限。关键主题包括Pt、Pd、Au、其他贵金属（如Ag、Ru和Rh）以及双金属修饰的SMOs，其中包括ZnO、SnO、WO、其他SMOs（如InO、FeO和CuO）以及异质结构SMOs。除了传统器件外，还讨论了光辅助室温气体传感器和机械柔性智能可穿戴设备等创新应用。此外，还详细总结了贵金属修饰导致传感性能提高的相关机制，包括电子敏化效应和化学敏化效应。最后，提出了基于贵金属修饰SMOs的化学电阻气体传感器面临的主要挑战和未来展望。
