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Proceedings Paper

Formation and optical properties of cylindrical gold nanoshells on silica and titania nanorods
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Paper Abstract

Metal-insulator core-shell structures have been demonstrated to have interesting and tunable optical properties. Systems previously investigated include silica-capped gold particles and gold shells surrounding silica particles. However, many of the systems studied so far have been spherical (or zero-dimensional). Thus, it would be of interest to look at the synthesis and optical properties of one-dimensional (i.e., rod-like) nanostructures. In this paper, the authors present and discuss the formation and properties of silica and titania nanorods encapsulated with a thin gold shell. Nanorods of silica and titania ~10 μm in length and with diameters ~ 90-200 nm are made by combining sol-gel electrophoresis with a suitable template. After removing the template at high temperature, the surface of the rods is re-hydrolyzed by heating in water. 3-Aminopropyltrimethoxysilane is reacted with the surface hydroxyl groups, self-assembling amine functionality on the surface of the rods. These groups act as anchoring sites for the gold, which forms a thin shell around the oxide nanorod. UV-vis absorbance spectra of these samples are analyzed to determine the relationships between shell thickness, core size, core material and properties.

Paper Details

Date Published: 4 November 2002
PDF: 9 pages
Proc. SPIE 4809, Nanoscale Optics and Applications, (4 November 2002); doi: 10.1117/12.451624
Show Author Affiliations
Steven J. Limmer, Univ. of Washington (United States)
Tammy P. Chou, Univ. of Washington (United States)
Guozhong Cao, Univ. of Washington (United States)

Published in SPIE Proceedings Vol. 4809:
Nanoscale Optics and Applications
Guozhong Cao; Wiley P. Kirk, Editor(s)

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