Carbon dots-based fluorescent probes for sensitive and selective detection of iodide

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• 作者：Fangkai Du (1)
  Fang Zeng (1)
  Yunhao Ming (1)
  Shuizhu Wu (1)
  
• 关键词：Carbon dots ; Fluorescence probe ; Iodide ; Mercury ion ; Fluorescence enhancement
• 刊名：Microchimica Acta
• 出版年：2013
• 出版时间：6 - April 2013
• 年：2013
• 卷：180
• 期：5
• 页码：453-460
• 全文大小：384KB
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• 作者单位：Fangkai Du (1)
  Fang Zeng (1)
  Yunhao Ming (1)
  Shuizhu Wu (1)
  
  1. College of Materials Science & Engineering, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, China
  
• ISSN：1436-5073

文摘

We report on a simple method for the determination of iodide in aqueous solution by exploiting the fluorescence enhancement that is observed if the complex formed between carbon dots and mercury ion is exposed to iodide. Fluorescent carbon dots (C-dots) were treated with Hg(II) ion which causes quenching of the emission of the C-dots. On addition of iodide, the Hg(II) ions are removed from the complex due to the strong interaction between Hg(II) and iodide. This causes the fluorescence to be restored and enables iodide to be determined in the 0.5 to 20?μM concentration range and with a detection limit of ~430?nM. The test is highly selective for iodide (over common other anions) and was used for the determination of iodide in urine. Figure A“turn-on-fluorescent probe based on carbon dots was obtained and using it to determine the concentration of iodide according to the fluorescent enhancement in aqueous solution