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银离子掺杂的碲化镉量子点作为汞检测的荧光探针。

Silver ion-doped CdTe quantum dots as fluorescent probe for Hg detection.

作者信息

Li Huazheng, Lu Wangwei, Zhao Gaoling, Song Bin, Zhou Jing, Dong Weixia, Han Gaorong

机构信息

State Key Laboratory of Silicon Materials & School of Materials Science and Engineering, Zhejiang University Hangzhou 310027 P. R. China

State Key Laboratory of Silicon Materials & Department of Physics, Zhejiang University Hangzhou 310027 P. R. China.

出版信息

RSC Adv. 2020 Oct 23;10(64):38965-38973. doi: 10.1039/d0ra07140d. eCollection 2020 Oct 21.

DOI:10.1039/d0ra07140d
PMID:35518388
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9057423/
Abstract

Mercury(ii), which is a well-known toxic species, exists in the industrial waste water in many cases. In the present work, CdTe quantum dots (QDs) are studied as a fluorescence probe for Hg detection. Ag ions are induced to QDs to enlarge their detection concentration range. l-cysteine is employed in the QD-based fluorescence probe to connect QDs with Hg. X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy results indicate the formation of zinc blende CdTe QDs with sizes of ∼5 nm and the existence of Ag in crystalline CdTe. Photoluminescence (PL) spectra and PL decay spectra were acquired to investigate the emission mechanism of Ag-doped CdTe QDs, revealing multi-emission in QD samples with higher concentrations of Ag doping. The highest PL quantum yield of the QD samples was 59.4%. Furthermore, the relationship between the fluorescence intensity and the concentration of Hg has been established. Two linear relationships were obtained for the plot of F/F against Hg concentration, enlarging the detection concentration range of Hg.

摘要

汞（II）是一种众所周知的有毒物质，在很多情况下存在于工业废水中。在本研究中，碲化镉量子点（QDs）被用作检测汞的荧光探针。银离子被引入量子点以扩大其检测浓度范围。L-半胱氨酸被用于基于量子点的荧光探针中，以将量子点与汞连接起来。X射线衍射、透射电子显微镜和X射线光电子能谱结果表明形成了尺寸约为5纳米的闪锌矿型碲化镉量子点，且银存在于结晶碲化镉中。获取了光致发光（PL）光谱和PL衰减光谱以研究掺银碲化镉量子点的发射机制，揭示了在高浓度银掺杂的量子点样品中存在多发射现象。量子点样品的最高PL量子产率为59.4%。此外，还建立了荧光强度与汞浓度之间的关系。对于F/F与汞浓度的关系图得到了两个线性关系，扩大了汞的检测浓度范围。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca92/9057423/7390ac4d5d56/d0ra07140d-f10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca92/9057423/16905a3cab5d/d0ra07140d-f1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca92/9057423/7406c1ff72bb/d0ra07140d-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca92/9057423/20964e64333f/d0ra07140d-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca92/9057423/968b931c80ae/d0ra07140d-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca92/9057423/59d66ebb48b4/d0ra07140d-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca92/9057423/4e5c40bb0b49/d0ra07140d-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca92/9057423/9fd24e80d35f/d0ra07140d-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca92/9057423/7390ac4d5d56/d0ra07140d-f10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca92/9057423/16905a3cab5d/d0ra07140d-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca92/9057423/57fc59fceb36/d0ra07140d-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca92/9057423/8e5981505619/d0ra07140d-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca92/9057423/7406c1ff72bb/d0ra07140d-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca92/9057423/20964e64333f/d0ra07140d-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca92/9057423/968b931c80ae/d0ra07140d-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca92/9057423/59d66ebb48b4/d0ra07140d-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca92/9057423/4e5c40bb0b49/d0ra07140d-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca92/9057423/9fd24e80d35f/d0ra07140d-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca92/9057423/7390ac4d5d56/d0ra07140d-f10.jpg

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