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采用不同尺寸的高荧光量子产率、单分散性水溶性CdTe量子点(QDs)与菲啰啉(Phen)配体结合,组装成QDs-Phen荧光探针。Phen对不同尺寸量子点荧光猝灭效率以及光致空穴转移效率表现为:2.3 nm的绿色CdTe量子点>2.8 nm的黄色CdTe量子点>3.3 nm的橙色CdTe量子点;不同粒径QDs-Phen荧光探针对Cd~(2+)的检测发现:粒径2.3 nm QDs-Phen荧光探针对Cd~(2+)检测线性范围为0.02~0.6μmol/L,检测限为0.01 mol/L;粒径2.8 nm QDsPhen荧光探针对Cd~(2+)检测线性范围为0.1 nmol/L~1.0μmol/L,检测限为0.05 nmol/L;而粒径3.3 nm QDs-Phen荧光探针对Cd~(2+)检测线性范围为0.2 nmol/L~1.5μmol/L,检测限为0.1 nmol/L。为选择合适粒径量子点的荧光探针对Cd~(2+)实际检测提供依据。
Using different sizes of high fluorescence quantum yield, monodisperse water-soluble CdTe quantum dots (QDs) were combined with Phen ligand to assemble QDs-Phen fluorescence probe. The fluorescence quenching efficiency and the photo-hole transfer efficiency of Phen for different sizes of quantum dots are as follows: the green CdTe quantum dots at 2.3 nm> the yellow CdTe quantum dots at 2.8 nm> the orange CdTe quantum dots at 3.3 nm; the QDs-Phen The detection of Cd2 + by fluorescence probe showed that the linear range of detection of Cd2 + was 0.02 ~ 0.6μmol / L with a detection limit of 0.01 mol / L for the 2.3 nm QDs-Phen fluorescence probe, The detection limit of Cd 2+ for 2.8 nm QDsPhen fluorescent probe was 0.1 nmol / L ~ 1.0 μmol / L, and the detection limit was 0.05 nmol / L. For QDs-Phen fluorescence probe with particle size of 3.3 nm, The linear range of ~ (2+) detection was 0.2 nmol / L ~ 1.5 μmol / L with the detection limit of 0.1 nmol / L. In order to select the appropriate size quantum dots for fluorescent probe Cd ~ (2+) to provide the basis for the actual test.