210. SHAPE-DEPENDENT LOCALIZED SURFACE PLASMON RESONANCES OF CU2-XS NANODISKS

Department: NanoEngineering
Research Institute Affiliation: Graduate Program in Materials Science and Engineering
Faculty Advisor(s): Andrea Tao

Primary Student
Name: Su-Wen Hsu
Email: s8hsu@ucsd.edu
Phone: 858-822-0241
Grad Year: 2014

Abstract
Anisotropic nanoparticles composed of noble metals have been demonstrated to exhibit multiple higher-order localized surface plasmon resonances (LSPRs) in the visible wavelengths. More recently, LSPRs have also been reported for doped semiconductor nanoparticles that are spherical in shape. We reported the observation of LSPRs of anisotropic semiconductor nanocrystals. We observed in-plane and out-of-plane dipole resonances for colloidal dispersion Cu2-xS nanodisks which its LSPRs matches our calculations for carrier densities in the electrostatic limit. We also observed that in-plane mode and out-of-plane LSPRs bands both blue-shifts with increased aspect ratio of Cu2-xS nanodisks. This is attributed to an increase in carrier density of Cu2-xS nanodisks during the thermal oxidation process. Shape and carrier density tuning the LSPRs of Cu2-xS nanodisks in near-IR range has potential application int thermal imaging and photovoltaic applications.

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