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Preparation and application of solvent‐modulated self‐doped N–S multicolour fluorescence carbon quantum dots
Author(s) -
Xu Jun,
Li Jinkai,
Wang Congling,
Zhao Weilin
Publication year - 2020
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.3698
Subject(s) - fluorescence , photoluminescence , carbon fibers , detection limit , solvent , dimethylformamide , hydrothermal circulation , quantum dot , biocompatible material , ion , linear range , chemistry , urea , metal ions in aqueous solution , photochemistry , materials science , carbon quantum dots , analytical chemistry (journal) , nanotechnology , chemical engineering , optoelectronics , chromatography , organic chemistry , optics , physics , medicine , biomedical engineering , composite number , composite material , engineering
In this paper, two types of carbon quantum dot (CQDs) were prepared using biocompatible l ‐methionine as the carbon source and urea as the nitrogen source and a one‐step hydrothermal treatment. By changing the reaction solvents (deionized (DI) water and dimethylformamide (DMF)), the maximum emission of the resulting CQDs shifted from blue to red light. Specifically, the emission wavelength of the CQDs moved from 433 nm to 625 nm following embedding of a new functional group (–CONH–) on the surface of the CQDs. Photoluminescence quantum yields of the CQDs with blue and red emission reached 64% and 61%, respectively. The R‐CQDs were used to detect metal ions and a linear relationship was demonstrated between ln(F/F 0 ) and Fe 3+ concentration in the range 0–0.5 mmol/L with a detection limit of 0.067 μM. Therefore these R‐CQDs have great potential as fluorescent probes for Fe 3+ detection. We expect that the excellent water‐soluble, biocompatible and optical properties of the CQDs developed in this work mean that they will be widely used to detect biological cells.