Fabrication, structure and luminescence properties of Al2O3/ZnO coaxial nanowires

Title
Fabrication, structure and luminescence properties of Al2O3/ZnO coaxial nanowires
Authors
이종무
Keywords
Al2O3 ZnO Transmission Photoluminescence Nanowires
Issue Date
2013
Publisher
OPTICAL MATERIALS
Series/Report no.
OPTICAL MATERIALS; vol.35 startpage 1824 endpage 1828
Abstract
Al2O3/ZnO coaxial nanowires were synthesized on (100) Si substrates by the thermal evaporation of a mixture of Al and TiO2 powders followed by atomic layer deposition of ZnO. Scanning electron microscopy revealed the Al2O3/ZnO coaxial nanowires to have a meandering shape with diameters of a few hundreds of nanometers, lengths of a few tens of micrometers and a ZnO shell layer thicknesses of 8?11 nm. Transmission electron microscopy and X-ray diffraction indicated that the cores and shells of the coaxial nanowires were single crystal rhombohedral-structured a-Al2O3 and polycrystalline wurtzite-structured ZnO, respectively. Al, Zn and O were detected in the energy dispersive X-ray spectrum, indicating that the coaxial nanowires contained almost no contaminants. The photoluminescence measurements showed that the Al2O3 nanowires had two weak emission bands centered at 710 nm in the red region 340 nm in the near-ultraviolet region. In contrast, Al2O3/ZnO coaxial nanowires had two emission bands: an emission band centered at approximately 570 nm in the yellow region and a weak emission band at approximately 340 nm in the near-ultraviolet region. The yellow emission might have originated from the ZnO shells in the Al2O3/ZnO coaxial nanowires, whereas the weak near-ultraviolet emission might be from the Al2O3 cores in the core?shell nanowires.
URI
http://dx.doi.org/10.1016/j.optmat.2013.03.023
http://dspace.inha.ac.kr/handle/10505/32790
ISSN
0925-3467
Appears in Collections:
College of Engineering(공과대학) > Materials Science & Engineering (신소재공학) > Journal Papers, Reports(신소재공학 논문, 보고서)
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