Journal
NANO LETTERS
Volume 16, Issue 6, Pages 3879-3884Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b01390
Keywords
Doped semiconductor; tungsten bronze; nanorod; platelet; metal oxide
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Funding
- U.S. Department of Energy (DOE) ARPA-E grant
- DOE SBIR grant
- National Science Foundation
- Welch Foundation [F-1848]
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Doped semiconductor nanocrystals are an emerging class of materials hosting localized surface plasmon resonance (LSPR) over a wide optical range. Studies so far have focused. on tuning LSPR frequency by controlling the dopant and carrier concentrations in diverse semiconductor materials. However, the influence of anisotropic nano-crystal shape and of intrinsic crystal structure on LSPR remain poorly explored. Here, we illustrate how these two factors collaborate to determine, LSPR characteristics in hexagonal cesium-doped tungsten oxide nanocrystals. The effect of shape anisotropy is systematically analyzed via synthetic control of nanocrystal aspect ratio (AR), from disks to nanorods. We demonstrate the dominant influence of crystalline anisotropy, which uniquely causes strong LSPR band-splitting into two distinct peaks with comparable intensities. Modeling typically used to rationalize particle shape effects is refined by taking into account the anisotropic dielectric function due to crystalline anisotropy, thus fully accounting for the AR-dependent evolution of multiband LSPR spectra. This new insight into LSPR Of semiconductor nanocrystals provides a novel strategy for an exquisite tuning of LSPR line shape.
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