Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 219, Issue -, Pages 248-256Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2019.04.065
Keywords
Carbon dots; Ratiometric sensing; Fluorescence and light scattering; Enhancement
Categories
Funding
- Analysis and Testing Foundation of Kunming
- University of Science and Technology, Yunnan Province, China [2018M20172118065]
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A new Cu-doped carbon dots (Cu-CDs) were synthesized rapidly and simply via one-step thermolysis of Na-2[Cu(EDTA)] and ascorbic add (AA) at 250 degrees C for 2 h with a high quantum yield of 9.8%. The Cu-CDs exhibits two signals of fluorescence at 396 nm and second-order scattering (SOS) at 617 nm under a single excitation wavelength of 308 nm, and can be obviously enhanced by tryptophan (Trp) or Fe(III) leading to the ratiometric fluorescence and SOS response with a good linear wider range of 0.5-250 mu M and 0.1-50 mu M, respectively. This sensing system exhibits good selectivity and sensitivity toward Trp and Fe(III) over other analytes with a low detection limit of 275 nM and 46 nM, respectively. Furthermore, the proposed sensing system displays a prospective application for quantitative assay of Trp and Fe(III) in practical sample. (C) 2019 Elsevier B.V. All rights reserved.
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