Optical absorption, induced bleaching, and photoluminescence of CdSe nanoplatelets grown in cadmium octanoate matrix

Alina Lyashchova,Tetyana Mirnaya,Igor Dmitruk,Andriy Dmytruk,Vitaliy Asaula,Gertruda Klimusheva

doi:10.1186/1556-276x-9-88

Alina Lyashchova, Tetyana Mirnaya + Show 4 more

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CdSe nanoparticles (NPs) are chemically synthesized in thermotropic ionic liquid crystalline (LC) phase of cadmium octanoate that was used as a nanoreactor. The nanocomposite samples are obtained by the rapid cooling of the LC phase to room temperature. Observed doublet structure in absorption spectra of the nanocomposites is characteristic for the two-dimensional CdSe nanoplatelets (NPLs). The thicknesses of the CdSe NPLs are 1.6, 1.9 and 2.3 nm as determined from the absorption spectra, and correspond to 4, 5 and 6 CdSe monolayers, respectively. Induced simultaneous bleaching of the doublet components observed under femtosecond laser excitation, as well as photoluminescence spectra and their kinetics are found compatible with the model of excitons with heavy- and light-hole valence bands confined in nanoplatelets.

Highlights

Many representatives of metal alkanoate salts form the thermotropic ionic liquid crystalline phase that has the structure of the smectic A at relatively high temperatures
Structural and optical properties of cadmium alkanoate composites with CdS quantum dots have been studied and it was shown that the template-controlled synthesis of semiconductor CdS in metal alkanoate matrix is very promising in creating nanocrystals with small dispersion of their sizes and uniformity on their shapes [2,3]
The doublets in the absorption spectra prompt to suppose the nanoplatelet shape of the formed CdSe nanoparticles, as it was proposed in the paper [6]

Summary

Introduction

Many representatives of metal alkanoate salts form the thermotropic ionic liquid crystalline phase that has the structure of the smectic A at relatively high temperatures (about +100°C and higher). Structural and optical properties of cadmium alkanoate composites with CdS quantum dots have been studied and it was shown that the template-controlled synthesis of semiconductor CdS in metal alkanoate matrix is very promising in creating nanocrystals with small dispersion of their sizes and uniformity on their shapes [2,3]. They are new perspective materials for many applications including lasers and sensors of near-ultraviolet. We discuss optical absorption and photoluminescence properties of CdSe nanocomposites prepared in cadmium octanoate matrix

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