Luminescent CdTe nanocrystals as ion probes and pH sensors in aqueous solutions

被引：136

作者：

Susha, Andrei S.

Javier, Almudena Munoz

Parak, Wolfgang J.

Rogach, Andrey L. ^{[1
]}

机构：

[1] Univ Munich, Dept Phys, D-80799 Munich, Germany

[2] Univ Munich, CeNS, D-80799 Munich, Germany

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2006年 / 281卷 / 1-3期

关键词：

nanocrystals; CdTe; ion probes; photoluminescence; sensors;

D O I：

10.1016/j.colsurfa.2006.02.014

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

CdTe nanocrystals capped by short-chain thiol molecules can easily be prepared in aqueous solution, possess a single narrow emission band and can potentially be used as luminescence sensors and ions probes. We report the effect of pH and various ions, including physiology important cations such as calcium(II), manganese(II) and iron(III), on the luminescence intensity of CdTe nanocrystals capped by thioglycolic acid. Quenching of luminescence of CdTe nanocrystals by Ag(I)-cations points out their use in cellular studies as fluorescent labels and quenching agents, respectively. Micromolar amounts of Hg2+ ions caused quenching of the emission of CdTe nanocrystals, while at increasing Hg2+ concentration alloyed Cd(x)Hgl(1-x)Te nanocrystals were formed, followed by appearance of a near-infrared luminescence band. Luminescence of both bare CdTe nanocrystals and CdTe nanocrystals embedded into polymer microcapsules was found to be pH sensitive within the pH range of 4-6. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：40 / 43

页数：4

共 23 条

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