title: A new turn-off fluorescence probe based on graphene quantum dots for detection of Au(III) ion.
abstract: In this work, a new turn-off fluorescence probe based on the graphene quantum dots (GQDs) was designed for detection and quantification of Au(III) ion. GQDs were prepared by two simple carbonization methods using glucose (g-GQDs) and citric acid (c-GQDs) as carbon sources. The effect of some metal ions on the fluorescence intensity of the prepared GQDs was studied. It was found that the fluorescence of both GQDs is significantly quenched by Au(III) ions but the sensitivity and analytical performances are different for two prepared GQDs. Using g-GQDs, a new analytical method was developed for the determination of Au(III) in the concentration range of 1.0-80 μM, with a detection limit of 0.5 μM. The developed method was applied to the determination of Au(III) in water and plasma samples with satisfactory results.
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz 5166616471, Iran. Electronic address: amjadi@tabrizu.ac.ir.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Amjadi
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz 5166616471, Iran.
authors.forename: Roghayeh
authors.initials: R
authors.lastname: Shokri
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz 5166616471, Iran.
authors.forename: Tooba
authors.initials: T
authors.lastname: Hallaj
mesh_terms: D005456:Fluorescent Dyes / Q000737:chemistry*; D006046:Gold / Q000032:analysis*; D006108:Graphite / Q000737:chemistry*; D007477:Ions; D045663:Quantum Dots / Q000737:chemistry* / Q000648:ultrastructure; D013050:Spectrometry, Fluorescence
chemical_list: D005456:Fluorescent Dyes; D007477:Ions; D006046:Gold; D006108:Graphite
keywords: Fluorescence quenching; Gold ions; Graphene quantum dots