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Fluorescent methionine-capped gold nanoclusters for ultra-sensitive determination of copper(II) and cobalt(II), and their use in a test strip

Authors
  • Sang, Fuming1
  • Zhang, Xue1
  • Shen, Fengyi1
  • 1 Harbin Institute of Technology, School of Marine Science and Technology, Weihai, 264209, People’s Republic of China , Weihai (China)
Type
Published Article
Journal
Microchimica Acta
Publisher
Springer-Verlag
Publication Date
May 23, 2019
Volume
186
Issue
6
Identifiers
DOI: 10.1007/s00604-019-3428-3
Source
Springer Nature
Keywords
License
Yellow

Abstract

A fluorometric assay was constructed for supersensitive determination of Cu2+ and Co2+ based on their quenching effect on the orange fluorescence of methionine-capped gold nanoclusters (Met-AuNCs). A simple one-step method was developed for the preparation of the Met-AuNCs, employing L-methionine as both a reducing and protecting reagent. Within 10 min, water soluble Met-AuNCs were obtained with an average size of 2.4 nm. Under photoexcitation at 370 nm, the Met-AuNCs possess a maximum emission at 580 nm and a quantum yield of 2.3%. The response is fast (1 min), and the selectivity for Cu2+ and Co2+ is high over other metal ions. The detection limits for Cu2+ and Co2+ are around 47 and 420 pM, respectively. The effects were used to design a test paper for visual detection of Cu2+ and Co2+. Using this test paper, 1 μM of Cu2+/Co2+ can be detect under the UV lamp (365 nm excitation). It is perceived to be a promising tool for the rapid on-site determination of Cu2+ and Co2+ in real water samples. Graphical abstractSchematic presentation of gold nanoclusters (AuNCs) synthesis with methionine as both reducing and protecting reagent, Cu2+/Co2+ detection based on the quenching of the fluorescence of AuNCs, and visual detection of Cu2+/Co2+ based on a respective test strip.

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