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Fluorescence “turn on” probe for bromide ion using nanoconjugates of glutathione-capped CdTe@ZnS quantum dots with nickel tetraamino-phthalocyanine: Characterization and size-dependent properties

Paper ID Volume ID Publish Year Pages File Format Full-Text
26969 43990 2013 9 PDF Available
Title
Fluorescence “turn on” probe for bromide ion using nanoconjugates of glutathione-capped CdTe@ZnS quantum dots with nickel tetraamino-phthalocyanine: Characterization and size-dependent properties
Abstract

•Glutathione capped CdTe@ZnS quantum dots have been conjugated to nickel tetraamino-phthalocyanine.•The fluorescence of quantum dots was “turned off” on conjugation.•The fluorescence was turned on by bromide ions.•The conjugate was used as a sensor for bromide ion detection.

In this paper, three differently sized glutathione (GSH)-capped CdTe@ZnS quantum dots (QDs) have been successfully conjugated to nickel tetraamino-phthalocyanine (NiTAPc) to form different QDs-NiTAPc nanocomplexes. Several techniques such as TEM, FT-IR, time-resolved fluorescence measurement and electronic spectroscopy were employed to characterize the nanocomplex. Bromide ion was chosen as a model anion to test the efficacy of the nanoprobe. The fluorescence of the nanoconjugate was “turned off” upon binding but was progressively “turned on” upon interaction with varying concentrations of bromide ion. Experimental results showed that the quantum size effect of nanocrystal QD determined the overall sensitivity and selectivity of the nanoprobe and followed the order QD563-NiTAPc > QD605-NiTAPc > QD621-NiTAPc. The mechanism of reaction is proposed.

Graphical abstractDifferently sized glutathione capped CdTe@ZnS quantum dots have been successfully conjugated to nickel tetraamino-phthalocyanine to form nanoconjugates whose fluorescence was “turned off” upon binding but was progressively “turned on” upon interaction with varying concentrations of bromide ion.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Bromide; Nickel tetraamino-phthalocyanines; Quantum dots; Fluorescence
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Fluorescence “turn on” probe for bromide ion using nanoconjugates of glutathione-capped CdTe@ZnS quantum dots with nickel tetraamino-phthalocyanine: Characterization and size-dependent properties
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 265, 1 August 2013, Pages 58–66
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