Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (1): 55.doi: 10.7503/cjcu20180369

• Analytical Chemistry • Previous Articles     Next Articles

Turn-off Fluorescence of Gold Nanoclusters for Sensing of Ferric Ion

LIU Qianrong1,2, CAI Huiwu1,*(), GUAN Ming2,3, QIAO Juan2,3, QI Li2,3,*()   

  1. 1. School of Chemistry and Chemical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China;
    2. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-05-18 Online:2019-01-10 Published:2018-11-09
  • Contact: CAI Huiwu,QI Li E-mail:caihuiwu@126.com;qili@iccas.ac.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.21727809, 21635008, 21621062) and the Key Programs of the Chinese Academy of Sciences, China(No.QYZDJ-SSW-SLH034).

Abstract:

D-Tryptophan-stabilized gold nanoclusters(D-Trp@AuNCs) were prepared by a simple one-pot synthesis protocol and displayed a specific response to Fe3+. The resultant AuNCs exhibited a strong blue fluorescence with the maximum emission at 440 nm wavelength. Due to the aggregation-induced fluorescence quenching mechanism, appearance of Fe3+ led dramatic fluorescent intensity decrease of AuNCs rather than other cations. Detection limit of the proposed assay for Fe3+ was 33.1 nmol/L, with a good linear range of 0.3—500.0 μmol/L(R2=0.9997). D-Trp@AuNCs were further applied in monitoring Fe3+ in real water samples, providing a new way for fabrication of AuNCs based fluorescent probes and showing great potential in environmental analysis.

Key words: Gold nanoclusters, D-Tryptophan, Fluorescence quenching, Ferric ion

CLC Number: 

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