Department of Physics, VIT University, Vellore, 632014, Tamil Nadu, India.
New Technologies-Research Centre, University of West Bohemia, Pilsen, 30100, Czech Republic.
Chemosphere. 2021 Oct;280:130641. doi: 10.1016/j.chemosphere.2021.130641. Epub 2021 Apr 29.
Over the last few decades, various volatile organic compounds (VOCs) have been widely used in the processing of building materials and this practice adversely affected the environment i.e. both indoor and outdoor air quality. A cost-effective solution for detecting a wide range of VOCs by sensing approaches includes chemiresistive, optical and electrochemical techniques. Room temperature (RT) chemiresistive gas sensors are next-generation technologies desirable for self-powered or battery-powered instruments utilized in monitoring emissions that are associated with indoor/outdoor air pollution and industrial processes. In this review, a state-of-the-art overview of chemiresistive gas sensors is provided based on their attractive analytical characteristics such as high sensitivity, selectivity, reproducibility, rapid assay time and low fabrication cost. The review mainly discusses the recent advancement and advantages of graphene oxide (GO) nanocomposites-based chemiresistive gas sensors and various factors affecting their sensing performance at RT. Besides, the sensing mechanisms of GO nanocomposites-based chemiresistive gas sensors derived using metals, transition metal oxides (TMOs) and polymers were discussed. Finally, the challenges and future perspectives of GO nanocomposites-based RT chemiresistive gas sensors are addressed.
在过去几十年中，各种挥发性有机化合物 (VOC) 已被广泛用于建筑材料的加工，这一做法对环境造成了不利影响，包括室内和室外空气质量。基于传感方法检测多种 VOC 的具有成本效益的解决方案包括电阻式、光学和电化学技术。室温 (RT) 电阻式气体传感器是下一代技术，适用于自供电或电池供电仪器，用于监测与室内/室外空气污染和工业过程相关的排放。在本综述中，根据其高灵敏度、选择性、重现性、快速分析时间和低制造成本等吸引人的分析特性，提供了电阻式气体传感器的最新概述。综述主要讨论了基于氧化石墨烯 (GO) 纳米复合材料的电阻式气体传感器的最新进展和优势，以及在 RT 下影响其传感性能的各种因素。此外，还讨论了基于金属、过渡金属氧化物 (TMO) 和聚合物的 GO 纳米复合材料电阻式气体传感器的传感机制。最后，讨论了基于 GO 纳米复合材料的 RT 电阻式气体传感器面临的挑战和未来展望。
