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

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• 作者：Ojodomo J. Achadu ; Tebello Nyokong
• 关键词：Graphene quantum dots ; Free radicals ; Fluorescence quenching ; Stern ; volmer quenching constant
• 刊名：Journal of Fluorescence
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：26
• 期：1
• 页码：283-295
• 全文大小：2,284 KB
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• 作者单位：Ojodomo J. Achadu (1)
  Tebello Nyokong (1)
  
  1. Department of Chemistry, Rhodes University, Grahamstown, 6140, South Africa
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Biomedicine
  Biomedicine
  Biophysics and Biomedical Physics
  Biotechnology
  Biochemistry
  Analytical Chemistry
  
• 出版者：Springer Netherlands
• ISSN：1573-4994

文摘

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. Keywords Graphene quantum dots Free radicals Fluorescence quenching Stern-volmer quenching constant