Balakrishnan, Thivyah and Sagadevan, Suresh and Le, Minh-Vien and Soga, Tetsuo and Oh, Won-Chun (2024) Recent progress on functionalized graphene quantum dots and their nanocomposites for enhanced gas sensing applications. Nanomaterials, 14 (1). ISSN 2079-4991, DOI https://doi.org/10.3390/nano14010011.
Full text not available from this repository.Abstract
Gas-sensing technology has witnessed significant advancements that have been driven by the emergence of graphene quantum dots (GQDs) and their tailored nanocomposites. This comprehensive review surveys the recent progress made in the construction methods and applications of functionalized GQDs and GQD-based nanocomposites for gas sensing. The gas-sensing mechanisms, based on the Fermi-level control and charge carrier depletion layer theory, are briefly explained through the formation of heterojunctions and the adsorption/desorption principle. Furthermore, this review explores the enhancements achieved through the incorporation of GQDs into nanocomposites with diverse matrices, including polymers, metal oxides, and 2D materials. We also provide an overview of the key progress in various hazardous gas sensing applications using functionalized GQDs and GQD-based nanocomposites, focusing on key detection parameters such as sensitivity, selectivity, stability, response and recovery time, repeatability, and limit of detection (LOD). According to the most recent data, the normally reported values for the LOD of various toxic gases using GQD-based sensors are in the range of 1–10 ppm. Remarkably, some GQD-based sensors exhibit extremely low detection limits, such as N-GQDs/SnO2 (0.01 ppb for formaldehyde) and GQD@SnO2 (0.10 ppb for NO2). This review provides an up-to-date perspective on the evolving landscape of functionalized GQDs and their nanocomposites as pivotal components in the development of advanced gas sensors. © 2023 by the authors.
| Item Type: | Article |
|---|---|
| Funders: | UNSPECIFIED |
| Uncontrolled Keywords: | Functionalized GQDs; Gas sensing mechanism; GQDs based nanocomposite; Improved sensing |
| Subjects: | Q Science > QD Chemistry T Technology > TP Chemical technology |
| Divisions: | Deputy Vice Chancellor (Research & Innovation) Office > Nanotechnology & Catalysis Research Centre |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 06 May 2024 03:35 |
| Last Modified: | 06 May 2024 03:35 |
| URI: | http://eprints.um.edu.my/id/eprint/44929 |
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