SONG Min-xia,GUAN Jie,CHEN Lu,et al.Construction of a Sol-Gel Molecularly Imprinted CsPbBr3 Quantum Dots Probe and Its Application in Fluorescence Detection of Cholesterol[J].Journal of Instrumental Analysis,2021,40(09):1367-1373.
SONG Min-xia,GUAN Jie,CHEN Lu,et al.Construction of a Sol-Gel Molecularly Imprinted CsPbBr3 Quantum Dots Probe and Its Application in Fluorescence Detection of Cholesterol[J].Journal of Instrumental Analysis,2021,40(09):1367-1373. DOI: 10.19969/j.fxcsxb.21010201.
Construction of a Sol-Gel Molecularly Imprinted CsPbBr3 Quantum Dots Probe and Its Application in Fluorescence Detection of Cholesterol
In this work, CsPbBr,3 ,quantum dots(QDs) were used as a new kind of fluorescence(FL)probe to detect cholesterol(CHO). By using 3-aminopropyltrimethoxysilane(APTES) as the functional monomer and CHO as the template molecule, a CHO molecularly imprinted layer was formed on CsPbBr,3, QDs via a simple silica sol-gel process. The formed silica layer not only improve the stability of CsPbBr,3, QDs by protecting CsPbBr,3, QDs from direct exposure to air and humidity, but also renders CsPbBr,3, QDs good selectivity to CHO. During the detection process, CHO was captured into the specific cavity sites of CHO-imprinted SiO,2, shell layers on CsPbBr,3,@SiO,2, QDs to cause the decrease of the FL intensity of CsPbBr,3, QDs. Under the optimal conditions, a good linear relationship was obtained between fluorescence quenching efficiency and the logarithm of CHO concentrations in the range of 1.00 × 10,-11,-5.00 × 10,-8, mol·L,-1,, with a detection limit down to 2.48 × 10,-12, mol·L,-1,. This sensor showed better sensitivity and selectivity to CHO than to other interferences. This work broadens the application horizon of CsPbBr,3, QDs and provides a new strategy for CHO detection.
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