双量子点纳米复合物NO比率荧光探针的合成与应用

摘要

A double quantum dots nanocomposite of CdSe@ SiO2‐CdTe was synthesized based on the electrostatic adsorption .A Cd‐NO complex was formed by the combination of nitric ox‐ide (NO) with Cd ions on the surface of CdTe quantum dots ,which led to CdTe quantum dots fluorescence quenching , without affecting the fluorescence of CdSe quantum dots .Further‐more ,its utility was carried out to detect NO quantitatively according to the linear relationship between the concentrations of NO (0 1.~2 2. μmol/L) and the relevant I603/I532 values of the ratiometric fluorescent sensor .%通过静电吸附作用，合成了CdSe＠ SiO2‐CdTe双量子点的纳米复合物．一氧化氮（NO）与CdTe量子点表面Cd离子结合形成Cd‐NO复合物，引起CdTe量子点荧光猝灭，而不影响CdSe量子点的荧光．当NO浓度在01．～22．μmol／L之间变化时，该探针荧光强度比值 I603／I532符合线性关系（R＝－09．954），从而实现对NO的定量检测．