Blue-Emitting Small Silica Particles Incorporating ZnSe-Based Nanocrystals Prepared by Reverse Micelle Method

Ando, Masanori; Li, Chunliang; Yang, Ping; Murase, Norio

doi:https://doi.org/10.1155/2007/52971

BioMed Research International

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Biomedical Applications of Colloidal Nanocrystals

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Volume 2007 | Article ID 052971 | https://doi.org/10.1155/2007/52971

Blue-Emitting Small Silica Particles Incorporating ZnSe-Based Nanocrystals Prepared by Reverse Micelle Method

Masanori Ando,¹Chunliang Li,¹Ping Yang,¹and Norio Murase¹

Academic Editor: Marek Osinski

Received16 May 2007

Revised17 Dec 2007

Accepted24 Dec 2007

Published27 Feb 2008

Abstract

ZnSe-based nanocrystals (ca. 4-5 nm in diameter) emitting in blue region (ca. 445 nm) were incorporated in spherical small silica particles (20–40 nm in diameter) by a reverse micelle method. During the preparation, alkaline solution was used to deposit the hydrolyzed alkoxide on the surface of nanocrystals. It was crucially important for this solution to include Zn2+ ions and surfactant molecules (thioglycolic acid) to preserve the spectral properties of the final silica particles. This is because these substances in the solution prevent the surface of nanocrystals from deterioration by dissolution during processing. The resultant silica particles have an emission efficiency of 16% with maintaining the photoluminescent spectral width and peak wavelength of the initial colloidal solution.

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Copyright © 2007 Masanori Ando et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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