Studies of electronic excitations of rectangular ZnO nanorods by electron energy-loss spectroscopy
Resource
Plasmonics, 7(1), 123-130
Journal
Plasmonics
Journal Volume
7
Journal Issue
1
Pages
123-130
Date Issued
2012
Date
2012
Author(s)
Wu, Chien-Ting
Liu, Chuan-Pu
Chen, Kuei-Hsien
Chen, Cheng-Hsuan
Abstract
Electronic excitations of single ZnO rectangular nanorod have been investigated by electron energy-loss spectroscopy in conjunction with scanning transmission electron microscopy (STEM-EELS). We focus primarily on the surface excitations greatly enhanced at the grazing incidence parallel to the surfaces of ZnO nanorods. An uncommon kind of surface excitation known as surface exciton polaritons occurring near interband transitions is found to dominate in the spectral range between the band gap at 3.4 eV and the surface plasmon peak at 15.8 eV. In addition, the dielectric function of ZnO up to 25 eV has also been derived from the bulk excitation spectra using the Kramers-Kronig analysis on a single nanorod. Theoretical EELS simulations are also compared with the experimental results and good agreements are obtained. © 2011 Springer Science+Business Media, LLC.
SDGs
Publisher
Springer Nature
Type
journal article
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