期刊
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
卷 414, 期 7, 页码 2471-2480出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-022-03888-w
关键词
Ratiometric fluorescence; Colorimetric; Sulfur quantum dots; Carbon quantum dots; Detection; Copper ions
A new dual-mode ratiometric fluorescence and colorimetric probe has been developed for selective determination of Cu2+. The probe shows high accuracy and sensitivity, and has immense potential for practical applications.
A new dual-mode ratiometric fluorescence and colorimetric probe for selective determination of Cu2+ was developed based on blue-emission sulfur quantum dots (SQDs) and yellow-emission carbon quantum dots (CQDs). The fluorescence and absorbance of CQDs increased in the presence of Cu2+ due to the Cu2+-oxidized o-phenylenediamine group on the surface of the CQDs. Because of the inner filter effect between SQDs and CQDs-Cu2+, the fluorescence response of SQDs decreased following the introduction of Cu2+. Furthermore, in the presence of Cu2+, the dual-mode SQD-CQD probe showed visible color changes under both ultraviolet light and sunlight. Under optimal conditions, the dual-mode probe was used to quantitatively detect Cu2+ with a linear range of 0.1-5.0 mu M for ratiometric fluorescence and colorimetry, with a limit of detection of about 31 nM and 47 nM, respectively. Finally, the dual-mode probe was used for the determination of Cu2+ in practical samples to expand the practical application, and the difference between ratiometric fluorescence and colorimetric methods was compared. The recovery results confirmed the high accuracy of the dual-mode probe, showing that it has immense potential for sensitive and selective detection of Cu2+ in practical samples.
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