College of Material Science and Engineering, Huaqiao University, Xiamen 361021, China.
Anal Chim Acta. 2012 Oct 9;746:90-7. doi: 10.1016/j.aca.2012.08.026. Epub 2012 Aug 23.
A new method for the preparation of mesoporous ZnO/CdS@SiO(2) core/shell nanostructure (CSN) has been developed. The mesoporous silica shells allow Ag(+) to enter into the interior of the nanostructures to contact with ZnO/CdS core, accordingly causes the quenching of its band edge emission (475 nm) along with a simultaneous enhancement of red emission at around 595 nm. So, a novel visual fluorescence detection strategy for Ag(+) ion is proposed based on a common core/shell Quantum dots nanostructure. Under optimal conditions, the enhanced fluorescence intensity at 595 nm increased linearly with the concentration of Ag(+) ion ranging from 0.03 μM to 0.24 μM with a detection limit (3σ) of 3.3 nM.
一种制备介孔 ZnO/CdS@SiO2 核/壳纳米结构 (CSN) 的新方法已经开发出来。介孔二氧化硅壳允许 Ag+进入纳米结构的内部与 ZnO/CdS 核接触，从而导致其带边发射 (475nm) 的猝灭，同时在 595nm 左右增强红色发射。因此，基于常见的核/壳量子点纳米结构，提出了一种用于 Ag+离子的新型可视化荧光检测策略。在最佳条件下，595nm 处的增强荧光强度与 Ag+离子的浓度呈线性关系，从 0.03 μM 到 0.24 μM，检测限 (3σ) 为 3.3 nM。
