Table of Contents
ISRN Nanotechnology
Volume 2011, Article ID 719027, 6 pages
http://dx.doi.org/10.5402/2011/719027
Research Article

Synthesis and Optical Manifestation of NiO-Silica Nanocomposite

Department of Physics and Technophysics, Vidyasagar University, Midnapore 721102, India

Received 17 March 2011; Accepted 4 May 2011

Academic Editors: G. A. Kachurin and D. Tsoukalas

Copyright © 2011 S. Chakrabarty and K. Chatterjee. 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

NiO-silica nanocomposites with average diameter ranging from 2–40 nm were prepared by sol-gel method followed by the heat treatment varying from 400°C to 1000°C. The details of morphology and crystalline nature of all the as prepared samples were characterized by TEM, HRTEM, and XRD analysis. The planes obtained from SAED pattern supports the planes originated from XRD study. From the optical absorption study, it is revealed that the band gap energy of NiO can extensively be manipulated by composite formation with silica and the size variation of that nanocomposite. Absorption peak position varies almost linearly with the oxidation temperature of the samples. Photoluminescence spectroscopy reveals that NiO-silica nanocomposite, prepared at 600°C and below, shows strong emission at 3.62 eV, but the nanocomposites with bigger size greatly hinder the effect of selective emissivity.