Issue 23, 2021

Recent trends in gas sensing via carbon nanomaterials: outlook and challenges

Abstract

The presence of harmful and poisonous gases in the environment can have dangerous effects on human health, and therefore portable, flexible, and highly sensitive gas sensors are in high demand for environmental monitoring, pollution control, and medical diagnosis. Currently, the commercialized sensors are based on metal oxides, which generally operate at high temperatures. Additionally, the desorption of chemisorbed gas molecules is also challenging. Hence, due to the large surface area, high flexibility, and good electrical properties of carbon nanomaterials (CNMs) such as carbon nanotubes, graphene and their derivatives (graphene oxide, reduced graphene oxide, and graphene quantum dots), they are considered to be the most promising chemiresistive sensing materials, where their electrical resistance is affected by their interaction with the analyte. Further, to increase their selectivity, nanocomposites of CNMs with metal oxides, metallic nanoparticles, chalcogenides, and polymers have been studied, which exhibit better sensing capabilities even at room temperature. This review summarizes the state-of-the-art progress in research related to CNMs-based sensors. Moreover, to better understand the analyte adsorption on the surface of CNMs, various sensing mechanisms and dependent sensing parameters are discussed. Further, several existing challenges related to CNMs-based gas sensors are elucidated herein, which can pave the way for future research in this area.

Graphical abstract: Recent trends in gas sensing via carbon nanomaterials: outlook and challenges

Article information

Article type
Review Article
Submitted
23 sen 2021
Accepted
01 okt 2021
First published
28 okt 2021
This article is Open Access
Creative Commons BY-NC license

Nanoscale Adv., 2021,3, 6514-6544

Recent trends in gas sensing via carbon nanomaterials: outlook and challenges

P. Dariyal, S. Sharma, G. S. Chauhan, B. P. Singh and S. R. Dhakate, Nanoscale Adv., 2021, 3, 6514 DOI: 10.1039/D1NA00707F

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