Interaction of CdTe Quantum Dots with 2,2-Diphenyl-1-Picrylhydrazyl Free Radical: A Spectroscopic, Fluorimetric and Kinetic Study

被引：7

作者：

Adegoke, Oluwasesan ^{[1
]}

Chidawanyika, Wadzanai ^{[1
]}

Nyokong, Tebello ^{[1
]}

机构：

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

来源：

JOURNAL OF FLUORESCENCE | 2012年 / 22卷 / 02期

基金：

新加坡国家研究基金会;

关键词：

2,2-Diphenyl-1-picrylhydrazine; Fluorescence quenching; Quantum dots; Thioglycolic acid; THIOGLYCOLIC ACID; CDSE; EMISSION; PROPERTY; DYNAMICS;

D O I：

10.1007/s10895-011-1012-2

中图分类号：

Q5 [生物化学];

学科分类号：

071010 ; 081704 ;

摘要：

The interaction of 2,2-diphenyl-1-picrylhydrazyl (DPPHau) free radical with thiol-capped CdTe quantum dots (QDs) has been studied by UV-vis spectroscopy, steady state and time resolved fluorescence measurements. Addition of DPPHau radical to CdTe QDs resulted in fluorescence quenching. The interaction occurs through static quenching as this was confirmed by fluorescence lifetime measurements. Time course absorption studies indicates that DPPHau may be reduced by interaction with QDs to the substituted hydrazine form (2,2-diphenyl-1-picrylhydrazine) DPPH-H. The mechanism of fluorescence quenching of CdTe QDs by DPPHau is proposed.

引用

页码：771 / 778

页数：8

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