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dc.contributor.authorNguyen Thi Ngoc Anhen_US
dc.contributor.authorDoong, Ruey-anen_US
dc.date.accessioned2020-07-01T05:21:20Z-
dc.date.available2020-07-01T05:21:20Z-
dc.date.issued2018-05-01en_US
dc.identifier.issn2574-0970en_US
dc.identifier.urihttp://dx.doi.org/10.1021/acsanm.8b00210en_US
dc.identifier.urihttp://hdl.handle.net/11536/154421-
dc.description.abstractIn this study, a simple one-step synthesis procedure for the fabrication of a gold Wnanoparticle (Au NP)@sulfur-doped graphene quantum dot (Au@S-GQD) with tunable size was developed for the sensitive and selective detection of 4-nitrophenol in water and wastewater with a complex matrix. The particle size of two to six layered S-GQD is in the range of 1-7 nm with a mean diameter of 4.0 +/- 0.5 nm. The S-GQD serves as a reducing agent for both Au ions and 4-nitrophenol reduction to generate Au@S-GQD nanocomposites as well as to produce the absorption signal of 4-aminophenol at 307 nm. The particle size of Au@S-GQD is tunable by simply adjusting the Au precursor concentration, and the mean diameter increases from 5 to 25 nm when the Au precursor concentration increases from 50 to 200 mu M. Moreover, the Au@S-GQD nanocomposite exhibits good UV-visible absorption properties, and the change of wavelength ratio between 307 and the SPR peak of Au at 530 nm (A(307)/A(530)) is used to detect nanomolar levels of 4-nitrophenol after the interaction of 4-nitrophenol with S-GQD by pi-pi stacking interaction. A wide dynamic range of 4 orders of magnitude with a limit of detection (LOD) of 3.5 nM in deionized water is achieved. The UV-visible response of Au@S-GQD also shows good selectivity to 4-nitrophenol detection over other aromatic and nitroarene compounds. In addition, the Au@S-GQD sensing platform is successfully applied to the detection of 0.05-50 mu M 4-nitrophenol in highly contaminated food wastewater with an LOD of 8.4 nM. The recovery of 0.1-20 mu M 4-nitrophenol in three different aqueous solutions with a complex matrix is in the range of 97 +/- 2 to 110 +/- 3%. Results obtained clearly indicate the superiority of using Au@S-GQD as the optical sensing probe for the detection of nano- to micromolar levels of 4-nitrophneols in aqueous solutions, which can be developed as a high performance and robust sensing platform for rapid detection of nitroaromatics in a wide variety of water and wastewater.en_US
dc.language.isoen_USen_US
dc.subjectsulfur-doped graphene quantum dot (S-GQD)en_US
dc.subjectgold nanoparticles (Au NPs)en_US
dc.subject4-nitrophenolen_US
dc.subjectoptical sensingen_US
dc.subjectwastewateren_US
dc.titleOne-Step Synthesis of Size-Tunable Gold@Sulfur-Doped Graphene Quantum Dot Nanocomposites for Highly Selective and Sensitive Detection of Nanomolar 4-Nitrophenol in Aqueous Solutions with Complex Matrixen_US
dc.typeArticleen_US
dc.identifier.doi10.1021/acsanm.8b00210en_US
dc.identifier.journalACS APPLIED NANO MATERIALSen_US
dc.citation.volume1en_US
dc.citation.issue5en_US
dc.citation.spage2153en_US
dc.citation.epage2163en_US
dc.contributor.department環境工程研究所zh_TW
dc.contributor.departmentInstitute of Environmental Engineeringen_US
dc.identifier.wosnumberWOS:000461400600018en_US
dc.citation.woscount8en_US
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