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Crown daisy leaf waste–derived carbon dots: A simple and green fluorescent probe for copper ion
Author(s) -
XiaoYan Wang,
XueYan Hu,
TianQi Wang,
XuCheng Fu
Publication year - 2020
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.6733
Subject(s) - fluorescence , copper , detection limit , carbon fibers , chemistry , quenching (fluorescence) , ion , metal ions in aqueous solution , photochemistry , inorganic chemistry , nuclear chemistry , analytical chemistry (journal) , materials science , organic chemistry , chromatography , composite number , composite material , physics , quantum mechanics
In this paper, N‐doped carbon quantum dots (N‐CDs) were fabricated using crown daisy leaves, a kitchen waste, as carbon source. The synthesized N‐CDs possessed abundant surface functional groups, such as hydroxyl, carboxyl, and amino groups, and had good dispersibility in water. Because of the special fluorescence quenching property toward Cu 2+ , the synthesized N‐CDs can be exploited as an effective label‐free fluorescent probe for Cu 2+ determination. The possible fluorescence sensing mechanism considered the selective coordination interaction between Cu 2+ ion and the hydroxyl, carboxyl, and amino groups of the N‐CDs. The control experiments also showed that the N‐doped aromatic C–N heterocycle structure played a crucial role in selective sensing of Cu 2+ . The decrease in fluorescence efficiencies was linearly related with the Cu 2+ concentrations in the range of 10.0nM to 120.0nM, with a response limit of 1.0nM. The prepared probe was also applied for Cu 2+ determination in real river water.