Journal
DYES AND PIGMENTS
Volume 219, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2023.111534
Keywords
Carbon dots; Fluorescent probe; Static quenching; Ag plus detection
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PEG-modified fluorescent carbon dots (PEG-CDs) were synthesized through a solid-state reaction, exhibiting bright blue emission and a high photoluminescence quantum yield (73.9%). The fluorescence of PEG-CDs can be significantly quenched by Ag+, showing high selectivity and sensitivity even in the presence of high concentrations of other metal ions. The fluorescence intensity decreases linearly with Ag+ concentration, with a detection limit of 0.114 nmol/L.
Silver-based compounds are widely used in modern society. However, excessive use and uncontrollable discharging of silver ions (Ag+) pose a potential threat to personal safety and the environment. In this work, PEGmodified fluorescent carbon dots (PEG-CDs) were synthesized through a facile solid-state reaction, exhibiting bright blue emission with a high photoluminescence quantum yield of 73.9%. The fluorescence of as-prepared PEG-CDs can be significantly quenched by the addition Ag+, showing high selectivity and sensitivity even without interference from high concentrations of other metal ions. The fluorescence intensity decreases linearly with Ag+ from 0 & mu;mol/L to 200 & mu;mol/L with a limit of detection of 0.114 nmol/L.
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