{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T03:56:07Z","timestamp":1791863767857,"version":"4.3.4"},"reference-count":124,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2023,12,19]],"date-time":"2023-12-19T00:00:00Z","timestamp":1702944000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nanomaterials"],"abstract":"<jats:p>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\u201310 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.<\/jats:p>","DOI":"10.3390\/nano14010011","type":"journal-article","created":{"date-parts":[[2023,12,19]],"date-time":"2023-12-19T11:17:24Z","timestamp":1702984644000},"page":"11","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":31,"title":["Recent Progress on Functionalized Graphene Quantum Dots and Their Nanocomposites for Enhanced Gas Sensing Applications"],"prefix":"10.3390","volume":"14","author":[{"given":"Thivyah","family":"Balakrishnan","sequence":"first","affiliation":[{"name":"Department of Chemical and Process Engineering, Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Suresh","family":"Sagadevan","sequence":"additional","affiliation":[{"name":"Nanotechnology & Catalysis Research Centre, University of Malaya, Kuala Lumpur 50603, Malaysia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6651-0121","authenticated-orcid":false,"given":"Minh-Vien","family":"Le","sequence":"additional","affiliation":[{"name":"Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), Ho Chi Minh City 700000, Vietnam"},{"name":"Faculty of Chemical Engineering, Vietnam National University Ho Chi Minh City, Ho Chi Minh City 700000, Vietnam"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3460-4593","authenticated-orcid":false,"given":"Tetsuo","family":"Soga","sequence":"additional","affiliation":[{"name":"Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0154-7388","authenticated-orcid":false,"given":"Won-Chun","family":"Oh","sequence":"additional","affiliation":[{"name":"Department of Advanced Materials Science and Engineering, Hanseo University, Seosan 356-706, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,12,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"132083","DOI":"10.1016\/j.chemosphere.2021.132083","article-title":"Advances of nanomaterials for air pollution remediation and their impacts on the environment","volume":"287","author":"Saleem","year":"2022","journal-title":"Chemosphere"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"135082","DOI":"10.1016\/j.chemosphere.2022.135082","article-title":"Metal-organic framework-based materials for the abatement of air pollution and decontamination of wastewater","volume":"303","author":"Daglar","year":"2022","journal-title":"Chemosphere"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"e12604","DOI":"10.1002\/eng2.12604","article-title":"Metal oxide semiconductors for gas sensing","volume":"5","author":"Goel","year":"2023","journal-title":"Eng. 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