“Nanotechnology” is an emerging as a significant development tool for the green synthesis of noble nanomaterial. Green synthesis is superior to conventional chemical methods as it is less expensive, reduced pollution, and enhances human health and the environment safety. Nanomaterial and their green synthesis from plants became an interesting aspect of nanotechnologies due to the many benefits they provide to living beings, as well as their low cost and minimal harm to humans and the environment. They also have a wide range of applications in biomedical research, diagnostics, and drug discovery and also in catalysis. The current review focuses on the synthesis of nanoparticle from plants using greener approach and their novel applications.

For field-like environmental gas monitoring and noninvasive illness diagnostics, effective sensing materials with exceptional sensing capabilities of sensitive, quick detection of volatile organic compounds (VOCs) are required. Carbon-based nanomaterials (CNMs), like CNTs, graphene, carbon dots (Cdots), and others, have recently drawn a lot of interest for their future application as an elevated-performance sensor for the detection of VOCs. CNMs have a greater potential for developing selective sensors that target VOCs due to their tunable chemical and surface properties. Additionally, the mechanical versatility of CNMs enables the development of novel gas sensors and places them ahead of other sensing materials for wearable applications. An overview of the latest advancements in the study of CNM-based sensors is given in this comprehensive organized review.

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