期刊
MATERIALS HORIZONS
卷 6, 期 3, 页码 470-506出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8mh01365a
关键词
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资金
- National Key Research and Development Program of China [2016YFB0402705]
- National Natural Science Foundation of China (NSFC) [21711530211, 61390502, 21673091]
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [51521003]
- Self-Planned Task of State Key Laboratory of Robotics and System (HIT) [SKLRS201607B]
- Shenzhen Science AMP
- Technology Project [JCYJ20170817100658231]
- Natural Science Foundation of Hubei Province [2015CFA125]
- UK Engineering Physics and Science Research Council [EPSRC EP/P018998/1, EP/P026435/1]
- Newton Mobility Grant through Royal Society [IE161019]
- NFSC
- Royal Academy of Engineering UK-Research Exchange with China and India
- EPSRC [EP/P018998/1, EP/P026435/1] Funding Source: UKRI
High-precision gas sensors operated at room temperature are attractive for various real-time gas monitoring applications, with advantages including low energy consumption, cost effectiveness and device miniaturization/flexibility. Studies on sensing materials, which play a key role in good gas sensing performance, are currently focused extensively on semiconducting metal oxide nanostructures (SMONs) used in the conventional resistance type gas sensors. This topical review highlights the designs and mechanisms of different SMONs with various patterns (e.g. nanoparticles, nanowires, nanosheets, nanorods, nanotubes, nanofilms, etc.) for gas sensors to detect various hazardous gases at room temperature. The key topics include (1) single phase SMONs including both n-type and p-type ones; (2) noble metal nanoparticle and metal ion modified SMONs; (3) composite oxides of SMONs; (4) composites of SMONs with carbon nanomaterials. Enhancement of the sensing performance of SMONs at room temperature can also be realized using a photo-activation effect such as ultraviolet light. SMON based mechanically flexible and wearable room temperature gas sensors are also discussed. Various mechanisms have been discussed for the enhanced sensing performance, which include redox reactions, heterojunction generation, formation of metal sulfides and the spillover effect. Finally, major challenges and prospects for the SMON based room temperature gas sensors are highlighted.
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