2D V2C MXene Based Flexible Gas Sensor for Highly Selective and Sensitive Toluene Detection at Room Temperature

Karmakar, S and Deepak, MS and Nanda, OP and Sett, A and Maity, PC and Karmakar, G and Sha, R and Badhulika, S and Bhattacharyya, TK (2024) 2D V2C MXene Based Flexible Gas Sensor for Highly Selective and Sensitive Toluene Detection at Room Temperature. In: ACS Applied Electronic Materials .

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Abstract

While the majority of the reports on toluene gas sensors are on rigid electrodes and based on composite materials, doping with additional noble metals, or a high temperature detection method, this work is the first demonstration of the vanadium carbide (V2C) MXene based flexible and room-temperature (RT) toluene gas sensor. The V2C MXene is synthesized by an HF etching route. The field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) images exhibit a typical accordion-like multilayered structure of the V2C MXene, where the Fourier-transform infrared spectroscopy (FTIR), Raman, and X-ray photoelectron spectroscopy (XPS) data further ensured its successful growth. The V2C (band gap of 3.9 eV) based flexible gas sensor employing a polyester substrate, displays good reproducibility, quick response/recovery time (14 s/34 s), long-term stability, good cross-selectivity, and a low detection limit of 47.85 ppb over the linear region of 5-200 ppm toluene at RT (27 ± 1 °C). The effect of relative humidity (RH) toward RT toluene gas sensing has also been investigated here. This sensor shows an excellent response of 775 at 200 ppm toluene, with brilliant selectivity toward toluene over six other hazardous gases. The sensor�s plentiful surface functional groups (�F, �OH, �O) and superior electrical characteristics are responsible for its enhanced performance. In light of this, the flexible and RT toluene gas sensor based on the V2C MXene can be a smart way to fabricate the next-generation toluene gas sensors. © 2024 American Chemical Society.

Item Type:	Journal Article
Publication:	ACS Applied Electronic Materials
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society.
Keywords:	Carbides; Chemical sensors; Energy gap; Etching; Field emission microscopes; Flexible displays; Fourier transform infrared spectroscopy; Gas detectors; Gases; High resolution transmission electron microscopy; Scanning electron microscopy; Toluene; X ray photoelectron spectroscopy, Composites material; Detection methods; Field emission scanning electron microscopy; Flexible; Gas-sensors; HF etching; High temperature detection; Synthesised; Toluene detection; V2C mxene, Room temperature
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	01 Jun 2024 05:22
Last Modified:	01 Jun 2024 05:22
URI:	https://eprints.iisc.ac.in/id/eprint/85139

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