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Fluorescent probe gold nanodots to quick detect Cr(VI) via oxidoreduction quenching process

  • Yueqi Zhao
  • Yuanqing Sun
  • Yingnan Jiang
  • Shanliang Song
  • Tianxin Zhao
  • Yue Zhao
  • Xinyu Wang
  • Baoquan Li
  • Bai Yang
  • Quan Lin
Articles
  • 3 Downloads

Abstract

A method is described here for the quickly (<30 s) accurate determination of Cr(VI) (Cr2O72−), based on fluorescent probes gold nanodots (AuNDs, excitation/emission peaks at 395/604 nm) coated with glutathione (GSH). The fluorescence of the AuNDs responses linearly to Cr(VI) concentrations, ranging widely from 1 nM to 10 mM with detection limit as low as 0.35 nM. At the same time, the AuNDs is demonstrated highly selective for Cr(VI) detection over other acid group ions and metal ions without any masking reagent. These make probability for practical use. The quenching mechanism is investigated deeply via fluorescent lifetime, XPS and TEM analysis. Different from most reported quenching explanation of aggregation derived from charge attraction, these results verify the redox reaction between Cr2O72− and sulfhydryl (–S) of GSH. The Au(I)–S bonds of AuNDs broke, accompanies with the oxidation of –S to form S–S bonds. As a result, AuNDs cross linked to each other. In the end, the fluorescence quenched. Attractively, the present study provides a new strategy for pollutant detection, such as from harmful Cr(VI) of Cr2O72− to nontoxic Cr(III).

Keywords

fluorescent probe of Cr (VI) Au nanodots quick and quantitative detection fluorescence quenching mechanism pollutant detection 

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Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (51373061, 21304090), Emphases Science and Technology Research Program of Jilin Province Science and Technology Development Plan (20180201060SF) and Science Foundation of China University of Petroleum, Beijing (2462017YJRC027).

Supplementary material

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.State Key Laboratory of Supramolecular Structure and Material, College of ChemistryJilin UniversityChangchunChina
  2. 2.Department of Oral Pathology, School and Hospital of StomatologyJilin UniversityChangchunChina
  3. 3.Jilin Ginseng AcademyChangchun University of Chinese MedicineChangchunChina
  4. 4.State Key Laboratory of Heavy Oil Processing, College of ScienceChina University of PetroleumBeijingChina

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