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Sol-gel synthesis and characterization of Ag nanoparticles in ZrO2 thin films

Published online by Cambridge University Press:  31 January 2011

Eisuke Yokoyama ,
Hironobu Sakata  and
Moriaki Wakaki
Moriaki Wakaki*
Affiliation:
Department of Optical and Imaging Science and Technology, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
*
a) Address all correspondence to this author. e-mail: wakaki@keyaki.cc.u-tokai.ac.jp
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Abstract

ZrO2 thin films containing silver nanoparticles were prepared using the sol-gel method with Ag to Zr molar ratios [Ag]/[Zr] = 0.11, 0.25, 0.43, 0.67, 1.00, 1.50, and 2.33. After dip coating on glass substrate, coated films were annealed at 200 and 300 °C in air. X-ray diffraction peaks corresponding to crystalline Ag were observed, but a specific peak corresponding to ZrO2 was not observed. At the molar ratio [Ag]/[Zr] = 0.25, the particle size of Ag distributed broadly centered at 17 nm for an annealing temperature of 200 °C and at 25 nm for 300 °C. The films annealed in air at 200 °C showed an absorption band centered at 450 nm because of the silver surface plasmon resonance, whereas films heated at 300 °C in air caused a red shift of the absorption to 500 nm. The absorption peak was analyzed using the effective dielectric function of Ag-ZrO2 composite films modeled with the Maxwell-Garnett expression.

Keywords

NanostructureOptical propertiesSol-gel
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 8 , August 2009 , pp. 2541 - 2546
Copyright
Copyright © Materials Research Society 2009

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