Journal
ANALYTICA CHIMICA ACTA
Volume 1048, Issue -, Pages 161-167Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2018.10.021
Keywords
QDs; Self-assembly; Aptamer; Exciton energy transfer; Fluorescent sensor; Hg2+
Categories
Funding
- Natural Science Foundation of Chinese [21377046]
- Natural Science Foundation of Shandong Province [ZR201702070162]
- Special Project of Independent Innovation and Achievements Transformation of Shandong Province [2014ZZCX05101]
- Science and Technology Development Plan Project of Shandong Province [2014GGH217006]
- UJN [ts20130937]
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Herein, an original exciton energy transfer-based sensitive fluorescence sensor for the determination of Hg2+ has been designed through DNA aptamer-programmed self-assembly of CdTe quantum dots (QDs). In this work, CdTe QDs were applied as fluorescence signal source. The two pieces of T-rich aptamer played a role as molecular recognition probes which could bind to the target Hg2+ specifically. The extent of Hg2+-triggered self-assembly of QDs depended on the concentration of Hg2+, which resulted in an exciton energy transfer effect between QDs, giving an obvious fluorescence signal decrease and red-shift of the fluorescent peak. Based on this principle, we could detect the Hg2+ in two different signal modes. The limit of detection (LOD) was 3.33 nM. The proposed sensing method exhibited its application in detecting Hg2+ in real water samples with satisfactory performance. The results indicated that this proposed sensor will be of great potential in biological and analytical fields. (C) 2018 Elsevier B.V. All rights reserved.
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