Effects of K+ and Na+ ions on the fluorescence of colloidal CdSe/CdS and CdSe/ZnS quantum dots

被引：21

作者：

Molnar, M. ^{[1
,2
,3
]}

Ning, Z. -J. ^{[1
]}

Chen, Y. ^{[2
,3
]}

Friberg, P. ^{[2
,3
]}

Gan, L. -M. ^{[2
,3
,4
]}

Fu, Y. ^{[1
]}

机构：

[1] Royal Inst Technol, Dept Theoret Chem, Sch Biotechnol, S-10691 Stockholm, Sweden

[2] Univ Gothenburg, Dept Mol & Clin Med Clin Physiol, Wallenberg Lab, Sahlgrenska Acad, S-41345 Gothenburg, Sweden

[3] Univ Gothenburg, Univ Hosp, S-41345 Gothenburg, Sweden

[4] AstraZeneca R&D, Atherosclerot Cardiovasc Dis, Biosci, S-43183 Molndal, Sweden

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2011年 / 155卷 / 02期

关键词：

Colloidal quantum dots (QDs); Fluorescence properties of QDs; Electron and hole confinements in QDs; Effects of K+ and Na+ ions; LIVE CELLS; NANOCRYSTALS; SIZE; PHOTOLUMINESCENCE; EMISSION; SHIFT; HG2+; CDTE;

D O I：

10.1016/j.snb.2011.01.055

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

In this work we studied the effects of K+ and Na+ ions on fluorescence properties of the colloidal quantum dots (QDs). It was found that the fluorescence intensity was enhanced when low concentration of ions was introduced to QD solutions, while it became weakened when ion concentrations reached their physiological levels in many bio environments. Such fluorescence changes can be attributed to interactions between QD surface ligands and ions as well as the Coulomb potential of ions that displaces the wave functions of the electron and hole confined inside the QD. These results are important for understanding the influence of different biological environments, such as extracellular and intracellular compartments, on optical properties of colloidal QDs. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：823 / 830

页数：8

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