Visual and trap emission spectrometric detections of Ag (I) ion with mesoporous ZnO/CdS@SiO2 core/shell nanocomposites |
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Authors: | Chuanxiao Yang Xiangying SunBin Liu |
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Affiliation: | College of Material Science and Engineering, Huaqiao University, Xiamen 361021, China |
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Abstract: | A new method for the preparation of mesoporous ZnO/CdS@SiO2 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. |
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Keywords: | Visual fluorescence detection Trap emission Dual-emission fluorescence Mesoporous ZnO/CdS@SiO2 core/shell nanostructures Ag+ ion |
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