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

被引：18

作者：

Adegoke, Oluwasesan ^{[1
]}

Nyokong, Tebello ^{[1
]}

机构：

[1] Rhodes Univ, Dept Chem, ZA-6140 Grahamstown, South Africa

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 2013年 / 265卷

基金：

新加坡国家研究基金会;

关键词：

Bromide; Nickel tetraamino-phthalocyanines; Quantum dots; Fluorescence; OPTICAL-PROPERTIES; RECOGNITION; SPECTROSCOPY; ENSEMBLE; CDSE;

D O I：

10.1016/j.jphotochem.2013.05.013

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

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 QD(563)-NiTAPc > QD(605)-NiTAPc > QD(621)-NiTAPc. The mechanism of reaction is proposed. (C) 2013 Elsevier B.V. All rights reserved.

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页码：58 / 66

页数：9

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