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Proceedings Paper

Preparation and characterization of polymer-coated nanoparticles
Author(s): Daniel B. Wolfe; Stephen J. Oldenburg; Sarah L. Westcott; Joseph B. Jackson; Mark Steven Paley; Naomi J. Halas
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Paper Abstract

We report the photodeposition of polymeric layers of nanometer scale thickness onto two nanoparticle substrates. This was accomplished by ultraviolet irradiation of a solution of functionalized diacetylene monomers in which the nanoparticles were suspended. Following photodeposition, the coated nanoparticles were analyzed using transmission electron microscopy and UV-visible spectroscopy. Highly regular polydiacetylene films with thicknesses from 2.5 - 25 nm were produced. The thickness measurements were facilitated by the attachment of small gold nanoparticles onto the surface of silica nanoparticle substrates prior to photodeposition, to provide contrast in the final TEM image. Deposition onto gold nanoshells was also demonstrated. Photodeposition onto these particles resulted in more individual coated particles. Furthermore, short irradiation times (approximately 5 minutes) yielded coated particles without the extra oligomeric contaminants usually found. This substantiates the idea that photodeposition occurs preferentially on a substrate material. UV-visible spectroscopy of the deposited films indicate that approximately 40% less conjugation is present relative to macroscopic polydiacetylene thin films grown with the same approach. This process yields a unique `nanolaminate' coating which may be useful in the modification of the physical, chemical, or optical properties of nanoparticles.

Paper Details

Date Published: 28 June 1999
PDF: 9 pages
Proc. SPIE 3793, Operational Characteristics and Crystal Growth of Nonlinear Optical Materials, (28 June 1999); doi: 10.1117/12.351406
Show Author Affiliations
Daniel B. Wolfe, Rice Univ. and Universities' Space Research Association (United States)
Stephen J. Oldenburg, Rice Univ. (United States)
Sarah L. Westcott, Rice Univ. (United States)
Joseph B. Jackson, Rice Univ. (United States)
Mark Steven Paley, Universities' Space Research Association (United States)
Naomi J. Halas, Rice Univ. (United States)

Published in SPIE Proceedings Vol. 3793:
Operational Characteristics and Crystal Growth of Nonlinear Optical Materials
Ravindra B. Lal; Donald O. Frazier, Editor(s)

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