| 论文标题 |
Using silicon-coated gold nanoparticles to enhance the fluorescence of CdTe quantum dot and improve the sensing ability of mercury (II) |
| 作者 |
Jian Zhu, Hui Chang, Jian-Jun Li, Xin Li, Jun-Wu Zhao |
| 发表/完成日期 |
2017-06-30 |
| 期刊名称 |
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy |
| 期卷 |
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| 相关文章 |
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| 论文简介 |
The effect of silicon-coated gold nanoparticles with different gold core diameter and silica shell thickness on the
fluorescence emission of CdTe quantum dots (QDs) was investigated. For gold nanoparticles with a diameter of
15 nm, silica coating can only results in fluorescence recover of the bare gold nanoparticle-induced quenching of
QDs. However, when the size of gold nanoparticle is increased to 60 nm, fluorescence enhancement of the QDs
could be obtained by silica coating. Because of the isolation of the silica shell-reduced quenching effect and
local electric field effect, the fluorescence of QDs gets intense firstly and then decreases. The maximum fluorescence
enhancement takes place as the silica shell has a thickness of 30 nm. This enhanced fluorescence from silicon-
coated gold nanoparticles is demonstrated for sensing of Hg2+. Under optimal conditions, the enhanced
fluorescence intensity decreases linearly with the concentration of Hg2+ ranging from 0 to 200 ng/mL. The
limit of detection for Hg2+ is 1.25 ng/mL. Interference test and real samples detection indicate that the influence
from other metal ions could be neglected, and the Hg2+ could be specifically detected.
© 2017 Elsevier B.V. All rights reserved. |
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