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

Andrei S. Susha; Almudena Muñoz Javier; Wolfgang J. Parak; Andrey L. Rogach

doi:10.1016/j.colsurfa.2006.02.014

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

Andrei S. Susha, Almudena Muñoz Javier, Wolfgang J. Parak, Andrey L. Rogach

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

148 Citations (Scopus)

Abstract

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_xHg_1-xTe 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. © 2006 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	40-43
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	281
Issue number	1-3
DOIs	https://doi.org/10.1016/j.colsurfa.2006.02.014
Publication status	Published - 15 Jun 2006
Externally published	Yes

Research Keywords

CdTe
Ion probes
Nanocrystals
Photoluminescence
Sensors

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10.1016/j.colsurfa.2006.02.014

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title = "Luminescent CdTe nanocrystals as ion probes and pH sensors in aqueous solutions",

abstract = "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 CdxHg1-xTe 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. {\textcopyright} 2006 Elsevier B.V. All rights reserved.",

keywords = "CdTe, Ion probes, Nanocrystals, Photoluminescence, Sensors",

author = "Susha, {Andrei S.} and Javier, {Almudena Mu{\~n}oz} and Parak, {Wolfgang J.} and Rogach, {Andrey L.}",

year = "2006",

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doi = "10.1016/j.colsurfa.2006.02.014",

language = "English",

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journal = "Colloids and Surfaces A: Physicochemical and Engineering Aspects",

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Luminescent CdTe nanocrystals as ion probes and pH sensors in aqueous solutions. / Susha, Andrei S.; Javier, Almudena Muñoz; Parak, Wolfgang J. et al.
In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 281, No. 1-3, 15.06.2006, p. 40-43.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

TY - JOUR

T1 - Luminescent CdTe nanocrystals as ion probes and pH sensors in aqueous solutions

AU - Susha, Andrei S.

AU - Javier, Almudena Muñoz

AU - Parak, Wolfgang J.

AU - Rogach, Andrey L.

PY - 2006/6/15

Y1 - 2006/6/15

N2 - 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 CdxHg1-xTe 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. © 2006 Elsevier B.V. All rights reserved.

AB - 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 CdxHg1-xTe 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. © 2006 Elsevier B.V. All rights reserved.

KW - CdTe

KW - Ion probes

KW - Nanocrystals

KW - Photoluminescence

KW - Sensors

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U2 - 10.1016/j.colsurfa.2006.02.014

DO - 10.1016/j.colsurfa.2006.02.014

M3 - RGC 21 - Publication in refereed journal

SN - 0927-7757

VL - 281

SP - 40

EP - 43

JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects

JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects

IS - 1-3

ER -

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

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