| 论文标题 |
CdTe quantum dot-based fluorescent probes for selective detection of Hg (II): The effect of particle size |
| 作者 |
Jian Zhu ⁎, Zhu-Jun Zhao, Jian-Jun Li, Jun-Wu Zhao ⁎ |
| 发表/完成日期 |
2017-01-27 |
| 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 |
Mercury ions-induced fluorescence quenching properties of CdTe quantum dots (QDs) have been studied using
the fluorescence spectroscopic techniques. By using the hydrothermal method, the CdTe QDs with different particles
sizes from1.98 to 3.68 nmhave been prepared, and the corresponding fluorescence emissionwavelength is
changed from 518 to 620 nm. The fluorescence of QDs is enhanced after linking Bovine serum albumin (BSA)
onto the surface of the QDs. Experimental results show that the fluorescence intensity of BSA-coated CdTe QDs
could be effectively quenched when Hg2+ react with BSA-coated CdTe QDs. Interestingly, both the sensing sensitivity
and selectivity of this fluorescence probe could be improved when the particle size of the QDs decreases.
Thus the BSA-coated CdTe QDs with green fluorescence emission have better advantages than the BSA-coated
CdTe QDs with red fluorescence for Hg2+ detection. Interference experiment results indicate that the influence
from other metal ions could be neglected in the detection, and the Hg2+ could be specifically detected. By
using this BSA-coated CdTe QDs-based fluorescence probe, the Hg2+ could be detected with an ultra-low detection
limit of nanomole level, and the linear range spans a scope from 0.001 to 1 μmol/L.
© 2017 Elsevier B.V. All rights reserved. |
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