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Journal of Nanomaterials
Volume 2012 (2012), Article ID 571315, 7 pages
http://dx.doi.org/10.1155/2012/571315
Research Article

Preparation and Characterization of Self-Assembled Thin Film of MPS-Capped ZnS Quantum Dots for Optical Applications

1Department of Physics, Yildiz Technical University, Esenler, 34220 Istanbul, Turkey
2Department of Physics, Istanbul Technical University, Maslak, 34469 Istanbul, Turkey
3Faculty of Arts and Sciences, Kadir Has University, Fatih, 34083 Istanbul, Turkey

Received 25 June 2012; Revised 16 October 2012; Accepted 16 October 2012

Academic Editor: Suprakas Sinha Ray

Copyright © 2012 Kenan Koç 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.

Abstract

For this study, we prepared colloidal ZnS quantum dots using 3-mercaptopropyltrimethoxysilane (MPS) as the capping agent. Colloidal ZnS quantum dots were directly deposited on glass substrates by a spin coating process. Therefore, self-assembled films made of ZnS quantum dots in a SiO2 network were obtained using only one production step. The films were heat-treated at 100°, 125°, 150°, 175° and 200°C in an N2 atmosphere. The results showed that the dimension of quantum dots changed from 2.8 nm to 3.2 nm by heat treatment. The refractive index, extinction coefficient, thickness, and dielectric coefficient values of the films were calculated. The present study showed that size and the refractive indices of films can be controlled by the heat treatment. Therefore, such films can be a good candidate in optical filter applications.