Journal
SENSORS AND ACTUATORS A-PHYSICAL
Volume 267, Issue -, Pages 242-261Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2017.10.021
Keywords
ZnO; Semiconductor material; Gas sensing; Room-temperature operation
Funding
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2016jcyjA0006]
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Novel gas sensors with high sensing properties, simultaneously operating at room temperature are considerably more attractive owing to their low power consumption, high security and long-term stability. Till date, zinc oxide (ZnO) as semiconducting metal oxide is considered as the promising resistive-type gas sensing material, but elevated operating temperature becomes the bottleneck of its extensive applications in the field of real-time gas monitoring, especially in flammable and explosive gas atmosphere. In this respect, worldwide efforts have been devoted to reducing the operating temperature by means of multiple methods In this communication, room-temperature gas sensing properties of ZnO based gas sensors are comprehensively reviewed. Much more attention is particularly paid to the effective strategies that create room-temperature gas sensing of ZnO based gas sensors, mainly including surface modification, additive doping and light activation. Finally, some perspectives for future investigation on room-temperature gas-sensing materials are discussed as well. (C) 2017 Elsevier B.V. All rights reserved.
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