Journal
MATERIALS LETTERS
Volume 194, Issue -, Pages 5-8Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2017.02.013
Keywords
L-Cystine modification; Copper nanoclusters; 2,4,6-trinitrotoluene; Turn-on; Fluorescence sensor
Funding
- National Natural Science Foundation of China [21175062]
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The rapid development of fluorescent nanomaterials has broadened a new horizon for the design of easy-to-use and sensitive sensors. Herein, the stable, water-soluble and fluorescent L-Cystine modified copper nanoclusters (CuNCs) were prepared via size-focusing etching method. The maximum emission wavelength of the obtained CuNCs was 500 nm with an excitation wavelength of 396 nm. The as-prepared CuNCs can only emit faint light when dispersed in aqueous solution, but generate obvious fluorescence intensity enhancement after adding specific amount of 2,4,6-trinitrotoluene (TNT). Under the optimal conditions, the CuNCs were adopted as an effective fluorescence probe for the detection of trace TNT through fluorescence turn-on mode for the first time. The calibration curve of TNT was linear up to 4.8 mu M with a detection limit of 9.1 nM. (C) 2017 Elsevier B.V. All rights reserved.
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