Interaction of Graphene Quantum Dots with 4-Acetamido-2,2,6,6-Tetramethylpiperidine-Oxyl Free Radicals: A Spectroscopic and Fluorimetric Study

被引：36
作者：
Achadu, Ojodomo J. [1 ]
Nyokong, Tebello [1 ]
机构：
[1] Rhodes Univ, Dept Chem, ZA-6140 Grahamstown, South Africa
来源：
JOURNAL OF FLUORESCENCE | 2016年 / 26卷 / 01期
基金：
新加坡国家研究基金会;
关键词：
Graphene quantum dots; Free radicals; Fluorescence quenching; Stern-volmer quenching constant; FLUORESCENCE; PHOTOLUMINESCENCE; SURFACE; PROBES;
D O I：
10.1007/s10895-015-1712-0
中图分类号：
Q5 [生物化学];
学科分类号：
071010 ; 081704 ;
摘要：
We report on the interaction of graphene quantum dots (GQDs) with 4-acetamido-2,2,6,6-tetramethylpiperidine-oxyl (4-acetamido-TEMPO) free radicals. The GQDs were N and S, N doped. The fluorescence quantum yields were higher for the doped GQDs compared to the undoped. The interaction is assessed by spectrofluorimetric, steady state/time resolved fluorescence and electron paramagnetic resonance (EPR) techniques. Fluorescence quenching was observed upon the addition of 4-acetamido-TEMPO to the GQDs. Photo-induced electron transfer (PET) mechanism was suggested as the plausible mechanism involved in the fluorescence quenching in which 4-acetamido-TEMPO acted as the electron acceptor.
引用
收藏
页码：283 / 295
页数：13
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