Journal
TALANTA
Volume 161, Issue -, Pages 476-481Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2016.08.082
Keywords
Carbon dots; Fluorescence; Optical sensing; Mercury ion detection
Categories
Funding
- NSFC [21405045, 21522502]
- Program for New Century Excellent Talents in University (China) [NCET-13-0789]
- Natural Science Foundation of Hunan Province for Distinguished Young Scholar [14111017]
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In this work, we demonstrated a convenient and green strategy for the synthesis of bright and water-soluble carbon dots (CDs) by carbonizing sodium citrate and glutathione together in a hydrothermal method for the first time. Without post surface modification, the as-synthesized CDs display fluorescence quantum yield (QY) as high as 21.03% and show superior stability not only in concentrated salt solutions but also in neutral and alkaline media. The probe exhibits selective and sensitive recognition capability towards mercury ion (Hg2+) in aqueous solution. The fluorescence of CDs can be quenched by Hg2+ through an effective electron energy transfer process. It displays a linear quenching effect toward mercury ion in the concentration range of 0-15 mu M with a correlation coefficient (R-2) of 0.99. The limit of detection is determined to be 25 nM at the signal to noise ratio of 3. These attractive merits would enable the extensive applications of this probe in environmental science and analytical chemistry in the future. (C) 2016 Elsevier B.V. All rights reserved.
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