title: Dopamine assay based on an aggregation-induced reversed inner filter effect of gold nanoparticles on the fluorescence of graphene quantum dots.
abstract: We describe a fluorescent dopamine assay that is based on the inner filter effect (IFE) of gold nanoparticles (AuNPs) on the fluorescence of graphene quantum dots (GQDs). The green fluorescence of GQDs is remarkably inhibited in the presence of citrate-stabilized AuNPs via IFE. Upon the addition of dopamine (DA), aggregation of the AuNPs occurs which is associated with a color change from red to blue. The IFE can no longer occur and the fluorescence of GQDs is recovered. Under the optimum conditions, a linear correlation exists between fluorescence intensity and the concentration of DA in the range from 20nM to 200nM with a detection limit of 15nM (at 3σ/s). The assay is rapid, inexpensive and highly sensitive.
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education, Key Laboratory for the Synthesis and Application of Organic Functional Molecules & College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, PR China.
authors.forename: Feng-E
authors.initials: FE
authors.lastname: Lin
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education, Key Laboratory for the Synthesis and Application of Organic Functional Molecules & College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, PR China.
authors.forename: Chuang
authors.initials: C
authors.lastname: Gui
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education, Key Laboratory for the Synthesis and Application of Organic Functional Molecules & College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, PR China; Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, Huangshi 435002, PR China. Electronic address: wenwei@hubu.edu.cn.
authors.forename: Wei
authors.initials: W
authors.lastname: Wen
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education, Key Laboratory for the Synthesis and Application of Organic Functional Molecules & College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, PR China.
authors.forename: Ting
authors.initials: T
authors.lastname: Bao
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education, Key Laboratory for the Synthesis and Application of Organic Functional Molecules & College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, PR China.
authors.forename: Xiuhua
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education, Key Laboratory for the Synthesis and Application of Organic Functional Molecules & College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, PR China. Electronic address: wangsf@hubu.edu.cn.
authors.forename: Shengfu
authors.initials: S
authors.lastname: Wang
keywords: Dopamine; Gold nanoparticles; Graphene quantum dots; Inner filter effect