Ge Liang, Mu Xiaolin, Tian Guiyun, Huang Qi, Ahmed Junaid, Hu Ze
Electrical and Mechanical Engineering Department, Southwest Petroleum University, Chengdu, China.
Department of Engineering, Newcastle University, Newcastle upon Tyne, United Kingdom.
Front Chem. 2019 Dec 10;7:839. doi: 10.3389/fchem.2019.00839. eCollection 2019.
Gas sensor, as one of the most important devices to detect noxious gases, provides a vital way to monitor the concentration and environmental information of gas in order to guarantee the safety of production. Therefore, researches on high sensitivity, high selectivity, and high stability have become hot issues. Since the discovery of the nanomaterial, it has been increasingly applied to the gas sensor for its distinguishing surface performances. However, 0-D and 1-D nanomaterials, with limited electronic confinement effect and surface effect, cannot reach the requirement for the production of gas sensors. This paper gives an introduction about the current researching progress and development trend of 2-D nanomaterials, analyzes the common forms of 2-D nanoscale structure, and summarizes the mechanism of gas sensing. Then, widely concerned factors including morphological properties and crystalline structure of 2-D nanomaterial, impact of doped metal on the sensibility of gas sensors, impact of symmetry, and working temperature on the selectivity of gas sensors have been demonstrated in detail. In all, the detailed analysis above has pointed out a way for the development of new 2-D nanomaterial and enhancing the sensibility of gas sensors.
气体传感器作为检测有害气体的最重要设备之一，为监测气体浓度和环境信息提供了至关重要的途径，以确保生产安全。因此，对高灵敏度、高选择性和高稳定性的研究已成为热点问题。自从纳米材料被发现以来，因其独特的表面性能，它在气体传感器中的应用越来越广泛。然而，零维和一维纳米材料由于电子限域效应和表面效应有限，无法满足气体传感器生产的要求。本文介绍了二维纳米材料的当前研究进展和发展趋势，分析了二维纳米尺度结构的常见形式，并总结了气敏机理。然后，详细阐述了包括二维纳米材料的形态特性和晶体结构、掺杂金属对气体传感器灵敏度的影响、对称性和工作温度对气体传感器选择性的影响等受到广泛关注的因素。总之，上述详细分析为新型二维纳米材料的开发和提高气体传感器的灵敏度指明了方向。
