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Download fileInfluence of Shape on the Surface Plasmon Resonance of Tungsten Bronze Nanocrystals
journal contribution
posted on 2014-03-11, 00:00 authored by Tracy
M. Mattox, Amy Bergerud, Ankit Agrawal, Delia J. MillironLocalized surface plasmon resonance
phenomena have recently been
investigated in unconventional plasmonic materials such as metal oxide
and chalcogenide semiconductors doped with high concentrations of
free carriers. We synthesize colloidal nanocrystals of CsxWO3, a tungsten bronze in which electronic
charge carriers are introduced by interstitial doping. By using varying
ratios of oleylamine to oleic acid, we synthesize three distinct shapes
of these nanocrystalshexagonal prisms, truncated cubes, and
pseudosphereswhich exhibit strongly shape-dependent absorption
features in the near-infrared region. We rationalize these differences
by noting that lower symmetry shapes correlate with sharper plasmon
resonance features and more distinct resonance peaks. The plasmon
peak positions also shift systematically with size and with the dielectric
constant of the surrounding media, reminiscent of typical properties
of plasmonic metal nanoparticles.
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Tungsten Bronze NanocrystalsLocalized surface plasmon resonance phenomenasymmetry shapesresonance peaksSurface Plasmon Resonanceplasmonic materialschalcogenide semiconductorsnanocrystalplasmonic metal nanoparticlesoleic acidcharge carriersplasmon resonance featurestungsten bronzeplasmon peak positionsmetal oxide