Issue 16, 2008
From the journal:

Physical Chemistry Chemical Physics

Control of the optical properties of CdTe nanocrystals by selective exchange of Te with thiolate: effect of organic ligands on the formation of core–shell structures

Takaaki Tsuruoka,ab   Rena Takahashi,ab   Kensuke Akamatsu*ab  and  Hidemi Nawafune*ab  

* Corresponding authors

a Graduate School of Science, Konan University, 8-9-1 Okamoto, Higashinada, Kobe, Japan

b Faculty of Science and Engineering, Konan University, 8-9-1 Okamoto, Higashinada, Kobe, Japan
E-mail: akamatsu@center.konan-u.ac.jp
Fax: +81 (0)78 435 2539
Tel: +81 (0)78 435 2489

Abstract

Changes in the optical properties of CdTe nanocrystals through selective surface exchange reaction with thiolate molecules in the organic phase are studied with an aim to investigate the mechanism and the role of organic ligands. The reaction was mediated by dissociation of Te anions viaoxidation in air from CdTe nanocrystals, followed by attachment of thiolate molecules in a 1:1 stoichiometric manner. This results in a gradual shell formation and a corresponding decrease in the size of the fluorescent CdTe cores, which induces a blue shift of both the absorption edge and emission wavelength in the visible region. A systematic study including the addition of ligands at different concentrations revealed that Te dissociation is the rate-determining step for the process and the degree of blue shift is significantly dependent on the amount of organic ligands present. The process could also be kinetically controlled through the addition of an excess amount of thiolate ligands, allowing systematic tuning of the emission properties of nanocrystals under ambient conditions.

Graphical abstract: Control of the optical properties of CdTe nanocrystals by selective exchange of Te with thiolate: effect of organic ligands on the formation of core–shell structures

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Article information

DOI
https://doi.org/10.1039/B717770D
Article type
Paper
Submitted
16 Nov 2007
Accepted
07 Feb 2008
First published
27 Feb 2008

Phys. Chem. Chem. Phys., 2008,10, 2221-2226

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Control of the optical properties of CdTe nanocrystals by selective exchange of Te with thiolate: effect of organic ligands on the formation of core–shell structures

T. Tsuruoka, R. Takahashi, K. Akamatsu and H. Nawafune, Phys. Chem. Chem. Phys., 2008, 10, 2221 DOI: 10.1039/B717770D

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