Title: Optical properties of a family of Au-nanoparticle-containing alumina membranes in which the nanoparticle shape is varied from needle-like (prolate) to spheroid, to pancake-like (oblate)
Abstract: The optical properties of a family of alumina membranes that contain Au nanoparticles with diameters of 52 nm and aspect ratios (length divided by diameter) varying from 0.38 (oblate or pancake-like) to 24 (prolate or needle-like) have been studied. The dynamic Maxwell-Garnett (DMG) theory was used to model the optical properties of these Au nanoparticle-containing membranes. The trend of a redshift in λmax for the plasmon resonance band with decreasing aspect ratio (observed previously for prolate particles) is observed over this entire aspect ratio range. Indeed, the redshift with decreasing aspect ratio becomes much more dramatic for the oblate particles. Because of this enhanced sensitivity of λmax to the aspect ratio, we suggest that the DMG theory can be used to obtain the aspect ratio for oblate Au nanoparticles of unknown length by matching the experimental λmax with a DMG calculated value using aspect ratio as the adjustable parameter.
Publication Year: 1997
Publication Date: 1997-07-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 26
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