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Silver-nanoparticle dispersion from the consolidation of Ag-attached silica colloid

Published online by Cambridge University Press:  03 March 2011

Tae-Gon Kim ,
Young Woon Kim ,
Jong Soon Kim  and
Byungwoo Park
Tae-Gon Kim*
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
Young Woon Kim
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
Jong Soon Kim
Affiliation:
Nanux Inc., Kimhae, Kyungnam, 621-881, Korea
Byungwoo Park*
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
*
a) Address all correspondence to these authors. e-mail: stylers2@snu.ac.krbyungwoo@snu.ac.kr
a) Address all correspondence to these authors. e-mail: stylers2@snu.ac.krbyungwoo@snu.ac.kr
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Abstract

Silver nanoparticles dispersed in a silica matrix were made by the consolidation of a Ag-attached silica colloid, which was synthesized via the electrolysis of a pure Ag electrode, the reduction of Ag+ ions by H2, and the nucleation and growth of Ag particles on the silica nanoparticles in water. This simple process produced Ag/silica nanocomposites with a high concentration and narrow size distribution of nanoparticles, which was confirmed by transmission electron microscopy and x-ray diffraction. As estimated by Raman and photoluminescence measurements, the quantity of broken oxygen bonds was increased with increasing Ag concentration due to the intervention of Ag ions as structural modifiers in the silica network structure. Ag ions in the matrix are probably a residue of the Ag+ ions that could not be reduced by H2 during the electrolysis/reduction reaction. The optical-absorption spectra and the HCl-soaking test suggested that a chemical-interface damping effect, which was caused by electron transfer from the metal particles to the oxide matrix, dominates the optical-absorption properties in this system.

Keywords

NanoparticleMicrostructureOptical properties
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 5 , May 2004 , pp. 1400 - 1407
Copyright
Copyright © Materials Research Society 2004

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