Abstract
The detection and quantification of hazardous substances and gases are critical for human health and safety. It has been difficult to develop materials that can respond to lower gas concentrations in a short time. In particular, carbon nanomaterials, for instance, carbon nanotubes (CNTs), graphene, and others have shown promise in environmental applications. Among these, CNT-based chemiresistive sensors have piqued researchers’ interest because of their ability to detect a variety of gaseous species selectively and quickly. Furthermore, owing to the high surface-to-volume ratio, high electrical conductivity, and outstanding thermal stability in nanowires, sensors based on nanowires are projected to have greatly improved performance. The electrical resistance of semiconducting CNTs increases or decreases substantially when exposed to gaseous molecules. In this chapter, we outline the possible applications of CNT-based chemiresistive gas sensors in a number of applications, such as environmental monitoring, medical diagnosis, food processing, human illness detection, agricultural industry, military applications, and explosive detection.
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