Journal
OPTICAL MATERIALS
Volume 99, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2019.109549
Keywords
AgInS2 quantum dots; Fluorescent sensors; Dopamine detection; Co-modifiers; Water soluble
Categories
Funding
- National Natural Science Foundation of China [21476183, 21676213]
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JM2026]
- Special Funds for Scientific Research of High-level Talents of Ankang University [2015AYQDZR02]
- Scientific Research Project of Shaanxi Education Department [18JK0014, 19JS003]
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Herein, a water soluble AgInS2 quantum dots (AIS QDs) with high sensitive and selective for dopamine (DA) were prepared through a clean and facile reflux method with the mercapto propionic acid (MPA) and polyethyleneimine (PEI) used as the co-modifiers. The fluorescence quench of as-fabricated MS QDs displayed an excellent selectivity and sensitivity to the DA and they showed a good linear relationship with the low detection limit (2.84 nm) in the range of 0.5-300 mu mol/L. The mechanism of fluorescence quench may attributed to the photoinduced electrons migrated from MS QDs to dopamine quinone, which originated from the oxidization of DA by ambient O-2. Our work shows a promising prospect of designing and preparing AIS QDs used as the fluorescence sensors for DA detection.
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