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The interaction between graphene quantum dots grafted with polyethyleneimine and Au@Ag nanoparticles: Application as a fluorescence “turn-on” nanoprobe

Paper ID Volume ID Publish Year Pages File Format Full-Text
26059 43932 2016 10 PDF Available
Title
The interaction between graphene quantum dots grafted with polyethyleneimine and Au@Ag nanoparticles: Application as a fluorescence “turn-on” nanoprobe
Abstract

•The fluorescence of graphene quantum dots grafted with polyethyleneimine was turned off by Au@Ag nanoparticles.•The fluorescence was turned on by biothiols, hence allowing for their detection.•A selective nanosensor was developed with no interferences from a selection of proteins and amino acids.

Graphene quantum dots grafted with polyethyleneimine (GQDs-PEI) and Au@Ag core-shell nanoparticles blend was demonstrated to be a novel biosensing nanoprobe for the rapid and highly sensitive detection of biothiols such as cysteine (Cys), homocysteine (Hcys) and glutathione (GSH). The fluorescence emission of GQDs-PEI was quenched efficiently upon interaction with Au@Ag core-shell nanoparticles. The quenched fluorescence emission of the GQDs-PEI was restored in the presence of the biothiols. The fluorimetric sensing is based on the strong affinity between the mercapto (SH) groups of the biothiols and the Au@Ag core-shell nanoparticles by which the interaction between GQDs-PEI and Au@Ag core-shell nanoparticles was disrupted with a consequent modulation (‘turn-on’) of the quenched GQDs-PEI emission. Thus, a new, simple, rapid and highly sensitive fluorescence nanoprobe for detecting biothiols has been developed in this work.

Graphical abstractThe fluorescence emission of graphene quantum dots (GQDs) grafted with polyethyleneimine (PEI) was “turned off” upon interaction with Au@Ag nanoparticles, and was “turned-on” in the presence of biothiols, resulting in a sensitive and selective fluorescence nanoprobe.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Graphene quantum dots; Polyethyleneimine; Gold and silver nanoparticles; Fluorescence ‘turn-on’
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The interaction between graphene quantum dots grafted with polyethyleneimine and Au@Ag nanoparticles: Application as a fluorescence “turn-on” nanoprobe
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 324, 30 June 2016, Pages 96–105
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us