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Fabrication of highly luminescent SiO2–Au nanostructures and their application in detection of trace Hg2+

  • Shengjie WangEmail author
  • Bingshun Cui
  • Qingwei Cai
  • Yong Bu
  • Xiaojuan Wang
  • Meiwen Cao
  • Yongqing Xia
  • Hua He
Chemical routes to materials

Abstract

Photoluminescence of gold nanoclusters (AuNCs) make them attractive in many fields including biological labeling and chemical detection. However, compared with organic dyes or quantum dots, the generally lower fluorescence efficiency of AuNCs limits their application. Here, an efficient and facile strategy is developed to fabricate highly luminescent SiO2–Au NCs nanostructures with a high quantum yield (33.3%) via a three-step procedure involving peptide self-assembly, biomimetic mineralization of silica, and conjugation of AuNCs. Photoluminescence lifetime, X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy were used to in-depth explore the mechanism for fluorescence enhancement. The results indicated that the fluorescence enhancement of SiO2–Au NCs is mainly attributed to the suppression of strong Au(I) → ligand charge transfer and non-radiative decay triggered by confinement effect. The SiO2–Au NCs solution presents relatively high fluorescence intensity over a wide range of pH and salt concentration. These superior properties make them an ideal candidate of fluorescent probes with excellent sensitivity and selectivity in the detection of Hg2+ ions. Moreover, the quenched fluorescence of SiO2–Au NCs can be recovered by the introduction of glutathione. Therefore, SiO2–Au NCs can serve as a recyclable fluorescent probe for the detection of Hg2+ and glutathione through the “fluorescence off” or “fluorescence on” process. The results provide a promising step toward the fabrication of highly fluorescent probes of AuNCs and further expand their application in chemical detection.

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (21773310, 21872173) and the Fundamental Research Founds for the Central Universities (15CX017A,18CX02126A).

Supplementary material

10853_2019_3391_MOESM1_ESM.docx (1.8 mb)
Supplementary material 1 (DOCX 1853 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Heavy Oil Processing and Centre for Bioengineering and BiotechnologyChina University of Petroleum (East China)QingdaoPeople’s Republic of China

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