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

Oluwasesan Adegoke, Tebello Nyokong (Lead / Corresponding author)

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)58-66
Number of pages9
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume265
Early online date2 Jun 2013
DOIs
Publication statusPublished - 1 Aug 2013

Keywords

  • Bromide
  • Nickel tetraamino-phthalocyanines
  • Quantum dots
  • Fluorescence

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