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Published on: May 2, 2014
Visual and trap emission spectrometric detections of Ag (I) ion with mesoporous ZnO/CdS@SiO2 core/shell
Chuanxiao Yang1, Xiangying Sun, Bin Liu
1College of Material Science and Engineering, Huaqiao University, Xiamen 361021, China.
Abstract:
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.
