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Upcycled Graphene Oxide Nanosheets for Reversible Room Temperature NO2 Gas Sensor

Authors :
Vien Trinh
Kai Xu
Hao Yu
Nam Ha
Yihong Hu
Muhammad Waqas Khan
Rui Ou
Yange Luan
Jiaru Zhang
Qijie Ma
Guanghui Ren
Jian Zhen Ou
Source :
Chemosensors, Vol 12, Iss 6, p 108 (2024)
Publication Year :
2024
Publisher :
MDPI AG, 2024.

Abstract

Graphene oxide (GO) nanosheets, as one of the most studied graphene derivatives, have demonstrated an intrinsically strong physisorption-based gas–matter behavior, owing to its enhanced volume–surface ratio and abundant surface functional groups. The exploration of efficient and cost-effective synthesis methods for GO is an ongoing task. In this work, we explored a novel approach to upcycle inexpensive polyethylene terephthalate (PET) plastic waste into high-quality GO using a combination of chemical and thermal treatments based on a montmorillonite template. The obtained material had a nanosheet morphology with a lateral dimension of around ~2 µm and a thickness of ~3 nm. In addition, the GO nanosheets were found to be a p-type semiconductor with a bandgap of 2.41 eV and was subsequently realized as a gas sensor. As a result, the GO sensor exhibited a fully reversible sensing response towards ultra-low-concentration NO2 gas with a limit of detection of ~1.43 ppb, without the implementation of an external excitation stimulus including elevating the operating temperature or bias voltages. When given a thorough test, the sensor maintained an impressive long-term stability and repeatability with little performance degradation after 5 days of experiments. The response factor was estimated to be ~11% when exposed to 1026 ppb NO2, which is at least one order of magnitude higher than that of other commonly seen gas species including CH4, H2, and CO2.

Details

Language :
English
ISSN :
22279040
Volume :
12
Issue :
6
Database :
Directory of Open Access Journals
Journal :
Chemosensors
Publication Type :
Academic Journal
Accession number :
edsdoj.9ae0892f72ce4c2a86d050cd8871e9aa
Document Type :
article
Full Text :
https://doi.org/10.3390/chemosensors12060108