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Green, fast, and large-scale synthesis of highly fluorescent Au nanoclusters for Cu2+ and temperature sensing

Abstract

Gold nanoclusters have attracted wide attention because of their unique optical and physical properties. However, traditional synthesis methods are complicated and require additional reducing agents and the amount of synthesis is very small. This is not only resource and time-consuming in synthesis process, but also limit their further application. Herein, a rapid sonochemical route is used to synthesize fluorescent Au nanoclusters in large quantities by using glutathione (GSH) as capping and reducing agent. The Au nanoclusters would be formed quickly (~40 min) due to presence of ultrasonic wave, which show orange red fluorescence (Em = 598 nm), small size (~2 nm) and good dispersion in aqueous solution. Moreover, GSH, as protecting agent on the surface of resultant Au nanoclusters, has many functional groups including carboxyl and amino groups which make nanoclusters show high photo-, time-, metal- and pH-stability. Then a stable Au nanoclusters-based nano-sensor is designed for highly sensitive and selective label-free detection of Cu2+ with the low of detection at 7 ppb (based on S/N = 3). The fluorescent probe can be used as versatile nanothermometry devices, because their fluorescence intensity correlates strongly with temperature and varies considerably over a wide temperature range (20-80 °C). Therefore, the novel fluorescent sensing probe has a great application prospect in Cu2+ detection and temperature sensing.

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Publication details

The article was accepted on 02 Sep 2018 and first published on 03 Sep 2018


Article type: Paper
DOI: 10.1039/C8AN01617H
Citation: Analyst, 2018, Accepted Manuscript
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    Green, fast, and large-scale synthesis of highly fluorescent Au nanoclusters for Cu2+ and temperature sensing

    Y. Jia, T. Zhaio, Y. Jiang, W. Sun, Y. Zhao, J. xin, Y. Hou and W. Yang, Analyst, 2018, Accepted Manuscript , DOI: 10.1039/C8AN01617H

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