Abstract
Environmental monitoring is necessary to protect humans from several hazardous gases. Hence, the recent development of nanotechnology for gas detection has initiated. The e-nose device is an excellent technology for environmental monitoring, as it is easy to implement, more effective, and economical. Electronic noses have been developed to mimic the human nose and to evaluate food quality as well as diseases. E-nose has various types based on operational mechanisms and technologies to monitor hazardous gases. Recently, various nanomaterials were investigated to tune the morphology of material which improves various sensing parameters such as sensitivity, selectivity, and response/recovery time for real-time environmental monitoring. Thus, this chapter reviews the various developed nanomaterials, electronic-nose systems, and algorithms that have potential applications for the specific detection of environmental pollutants. This chapter focuses on various issues and challenges faced during the synthesis of nanomaterials and the development of e-nose along with loopholes that are still to be addressed.
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