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Open AccessArticle

Methionine-Capped Gold Nanoclusters as a Fluorescence-Enhanced Probe for Cadmium(II) Sensing

by Yan Peng 1,2, Maomao Wang 1, Xiaoxia Wu 1, Fu Wang 1,* and Lang Liu 2,*
1
Laboratory of Environmental Sciences and Technology, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China
2
College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, Xinjiang, China
*
Authors to whom correspondence should be addressed.
Sensors 2018, 18(2), 658; https://doi.org/10.3390/s18020658
Received: 20 December 2017 / Revised: 5 February 2018 / Accepted: 5 February 2018 / Published: 23 February 2018
(This article belongs to the Special Issue Fluorescent Probes and Sensors)
Gold nanoclusters (Au NCs) have been considered as novel heavy metal ions sensors due to their ultrafine size, photo-stability and excellent fluorescent properties. In this study, a green and facile method was developed for the preparation of fluorescent water-soluble gold nanoclusters with methionine as a stabilizer. The nanoclusters emit orange fluorescence with excitation/emission peaks at 420/565 nm and a quantum yield of about 1.46%. The fluorescence of the Au NCs is selectively and sensitively enhanced by addition of Cd(II) ions attributed to the Cd(II) ion-induced aggregation of nanoclusters. This finding was further used to design a fluorometric method for the determination of Cd(II) ions, which had a linear response in the concentration range from 50 nM to 35 μM and a detection limit of 12.25 nM. The practicality of the nanoprobe was validated in various environmental water samples and milk powder samples, with a fairly satisfactory recovery percent. View Full-Text
Keywords: methionine; gold nanoclusters; fluorescence; enhancing; cadmium ion; water; milk methionine; gold nanoclusters; fluorescence; enhancing; cadmium ion; water; milk
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MDPI and ACS Style

Peng, Y.; Wang, M.; Wu, X.; Wang, F.; Liu, L. Methionine-Capped Gold Nanoclusters as a Fluorescence-Enhanced Probe for Cadmium(II) Sensing. Sensors 2018, 18, 658.

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