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Low-temperature operating ZnO-based NO2 sensors: a review

机译：基于低温操作ZnO的NO2传感器：审查

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摘要

Owing to its excellent physical and chemical properties, ZnO has been considered to be a promising material for development of NO _(2) sensors with high sensitivity, and fast response and recovery. However, due to the low activity of ZnO at low temperature, most of the current work is focused on detecting NO _(2) at high operating temperatures (200–500 °C), which will inevitably increase energy consumption and shorten the lifetime of sensors. In order to overcome these problems and improve the practicality of ZnO-based NO _(2) sensors, it is necessary to systematically understand the effective strategies and mechanisms of low-temperature NO _(2) detection of ZnO sensors. This paper reviews the latest research progress of low-temperature ZnO nanomaterial-based NO _(2) gas sensors. Several efficient strategies to achieve low-temperature NO _(2) detection (such as morphology modification, noble metal decoration, additive doping, heterostructure sensitization, two-dimensional material composites, and light activation) and corresponding sensing mechanisms (such as depletion layer theory, grain boundary barrier theory, spill-over effects) are also introduced. Finally, the challenges and future development directions of low-temperature ZnO-based NO _(2) sensors are outlined.
机译：由于其优异的物理和化学性质，ZnO被认为是开发具有高灵敏度和快速响应和恢复的NO _（2）传感器的有希望的材料。但是，由于ZnO在低温下的低活性，大多数当前工作都集中在高工作温度（200-500°C）下检测NO _（2），这将不可避免地增加能量消耗并缩短寿命传感器。为了克服这些问题，提高ZnO的NO _（2）传感器的实用性，有必要系统地了解ZnO传感器的低温NO_（2）检测的有效策略和机制。本文评论了低温ZnO纳米材料的NO _（2）气体传感器的最新研究进展。几种高效策略以实现低温NO _（2）检测（如形态学修饰，贵金属装饰，添加剂掺杂，异质敏感，二维材料复合材料和光激活）和相应的传感机制（例如耗尽层理论也介绍了晶界屏障理论，溢出效应。最后，概述了低温ZnO的NO _（2）传感器的挑战和未来发展方向。

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