Observation of spectral anisotropy of gold nanoparticles

Metallic nanoparticles synthesized by solution-phase chemistry usually exhibit various polygonal morphologies. The shape is known to have a great impact on a nanoparticle's optical properties, for instance, the surface plasmon resonance frequency. It remains unclear, however, whether the scatte...

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Bibliographic Details
Published in:The Journal of chemical physics Vol. 129; no. 4; p. 044503
Main Authors: Cang, Hu, Montiel, Daniel, Xu, C Shan, Yang, Haw
Format: Journal Article
Language:English
Published: United States 28.07.2008
Subjects:
Anisotropy
Color
Gold - chemistry
Light
Metal Nanoparticles - chemistry
Spectrum Analysis - methods
ISSN:1089-7690, 1089-7690
Online Access:Get more information
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Summary:Metallic nanoparticles synthesized by solution-phase chemistry usually exhibit various polygonal morphologies. The shape is known to have a great impact on a nanoparticle's optical properties, for instance, the surface plasmon resonance frequency. It remains unclear, however, whether the scattering spectrum of nanoparticles is generally anisotropic in the far field as a result. This simple question turns out to be extremely challenging to address because of the particle-to-particle shape inhomogeneity in a bulk sample, and the high sensitivity of surface plasmon resonance to local environments. We report the observation of scattering angle-dependent spectra using a newly developed single-particle tracking spectroscopy (SPS). Furthermore, we show that SPS has provided a way to directly visualize the rotational random walk of individual gold nanoparticles in water for the first time.
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ISSN:1089-7690
1089-7690
DOI:10.1063/1.2958912