Localized Surface Plasmon Enhanced Green-Yellow Light Emission of the ZnO Nanorod Arrays Using Metal Island Film
Date Issued
2008
Date
2008
Author(s)
Lin, Chin-An
Abstract
In this thesis, we synthesized the high orientation ZnO nanorods array by hydrothermal process. First, we studied the ZnO on the Au-coated Si substrate. The diameter of ZnO arrays could be controlled with the aid of Au island films as a catalyst. The X-ray diffraction investigation indicated that the epitaxy of the ZnO array preferred to grow along the plane (103). Defect-level emission was greatly enhanced due the localized surface plasmon resonance of Au island film coupled with ZnO array. The intensity ratio of visible/UV was enhanced 107 times with the aid of Au island films. The enhanced DLE redshift from 570 to 600 nm confirms that the PL enhancement arises mostly from the effective scattering of the LSP in the longer wavelength range of in-plane resonance band. Second, we demonstrate that vertical well-aligned crystalline ZnO nanorods arrays were grown on Ag/Si substrates by hydrothermal process. Different thicknesses of Ag films on Si substrates were prepared by e-gun evaporator. The morphology of Ag films were observed by the scanning electron microscopy. The XRD of ZnO on Ag islands result indicated that the epitaxy will grow along the plane (002). The Ag films have help for the enhancement of the emission at around 500nm. We prove that the LSP resonance depends on the size of the metal and the LSP resonance only happens at specific wavelength. The effect of the LSP varies with both the intensity and wavelength of DLE.
Subjects
ZnO
nanorods
Photoluminescence (PL)
cathodoluminescence (CL)
Localized Surface Plasmon Resonance (LSPR)
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-97-R95941090-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):2a3308bda8af0d325ef9adce73feebe7