Abstract
The design of novel Cu2+ quantitative sensors with highly sensitivity and selectivity is a hot topic of modern chemistry. Herein, a novel ratiometric fluorescence (PL) sensor based on the red-emitting CdTeS quantum dots (QDs) and blue-emitting polyethyleneimine-functionalized carbon dots (PEI-CDs) was firstly designed for sensing Cu2+. In the presence of Cu2+, a good linear relationship between the ratios (F520/F690) of the two peak intensities and the concentrations of Cu2+ was observed in the range of 0.01–250 µM with the correlation coefficient (R2) of 0.993 and the detection limit as low as 8.07 nM. The ratiometric nanosensor was also used to successfully determine Cu2+ in plasma samples with satisfactory results obtained. Therefore, we hold the opinion that the developed ratiometric fluorescent sensor based on CdTeS QDs/PEI-CDs will provide technical support for the point-of-caretesting of Cu2+.
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