Nanomaterial-based Sensing of Low-concentration NO2 Gas: A Review

Golam Imran Hussain, Rashi Borgohain

Abstract


This paper highlights the recent advances and new trends in nanomaterial-based detection of NO2 in ambient air, which is the major constituent of polluted air. The development of rapid, sensitive, and reliable gas sensing techniques is essential for the benefit of human life and health. Gas sensors are emerging as important devices in both industrial and medical applications. As a result, more and more work has been done in recent years to develop gas sensors with high selectivity, sensitivity, reproducibility, and stability. As such, various nanomaterials have been explored to improve the overall performance of gas sensors, among which, ZnO, ZnO-ZnS, and carbon dots (CDs) have received enormous attention due to their excellent performance. This paper reviews the applications of ZnO, ZnO-ZnS, and Carbon Dots (CDs) for sensing low-concentration NO2. The synthesis methods and performance characteristics of these nanomaterials are discussed in detail. Lastly, the challenges, and perspectives on the future trends of these nanomaterial-based gas sensors are highlighted.

Keywords


Carbon Dot; Gas Sensor; NO2; ZnO; ZnO-ZnS

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