E-Nose, a versatile smart electronic nanosystem: Advances in the nanomaterials, fabrication of device, and their potential applications
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Abstract
The unprecedented innovations happened in past half a decade in the field of nanoscience and nanotechnology has opened up many possibilities to address the various issues of engineering, medical and agriculture which otherwise were considered difficult to solve. Currently the personal health monitoring, assessing the quality of food, vegetables, fruits, air, and water we consume is now possible due to developments in wearable electronic devices. Very recent research advancements in the field of gas, odor, volatile organic compounds (VOCs) sensors has led the development of the device similar to our nose, called electronic nose (e-nose). This device mimics the human nose, and able to interpret the type of chemical compounds similar to our nose. It mainly consist of two parts: a gas sensing part and an information processing part. This review is aimed to provide an overview about the recent developments in the various nanomaterials used to construct the e-nose device, their functionalities, characteristics, and applications. The review also covers the latest developments especially in the e-nose device components such as sensor array components, design of hardware circuit, gas circulation system and sampling design. Very importantly, the nanomaterials such as graphene, CNT, metal oxide, metal chalcogenides etc, used for sensor design by various research groups are explored in this review. Finally, the review summarizes the applications of e-nose in human health monitoring systems, food quality monitoring, meat freshness monitoring, and explosives detection systems and also the future trends of e-noses especially its integration with the IOT, mobiles, wearable e-noses etc.
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e-nose, VOC, Biomarkers, Nanomaterials, Sensors, Food Quality, Air Quality, Meat Freshness
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