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Catalyst-free thermally-evaporated growth and optical properties of ZnO nanowires on Si, GaN and sapphire substrates

Title
Catalyst-free thermally-evaporated growth and optical properties of ZnO nanowires on Si, GaN and sapphire substrates
Author
심광보
Keywords
ZnO; nanowires; thermal evaporation; photoluminescence; nanostructures; ZINC-OXIDE NANOWIRES; FIELD-EMISSION PROPERTIES; PULSED-LASER DEPOSITION; VAPOR-PHASE TRANSPORT; ROOM-TEMPERATURE; SEED LAYER; ARRAYS; PHOTOLUMINESCENCE; FILMS; EPITAXY
Issue Date
2013-01
Publisher
John Wiley & Sons, Ltd
Citation
CRYSTAL RESEARCH AND TECHNOLOGY, 2013, 48(2), 75p ~ 86p
Abstract
Vertically well-aligned zinc oxide nanowires (NWs) with high density were successfully synthesized on Si, sapphire and GaN/sapphire substrates by thermal evaporation of zinc powders without catalysts or additives. The growth behavior of ZnO NWs was strongly dependent on the substrate materials. The effects of the substrate position on the structures and properties of ZnO NWs were primarily discussed. The morphology and crystallinity of the resultant NWs were studied by scanning electron microscope, transmission electronic microscope and X-ray diffraction. The photoluminescence (PL) characteristics of the ZnO NWs on the different substrates were studied. The results showed that the as-grown ZnO NWs exhibit a sharp and strong ultraviolet emission at 3.27 eV and a very weak green emission at around 2.48 eV, indicating that the a-synthesized NWs have excellent PL properties with good crystalline quality and can be an ideal candidate for making luminescent devices. By comparison of PL spectra, we revealed that the green-to-UV emission intensity ratios were considerably dependent on the substrate materials, which was explained by the difference in the structural morphology of the produced nanowires.
URI
https://onlinelibrary.wiley.com/doi/full/10.1002/crat.201200454http://repository.hanyang.ac.kr/handle/20.500.11754/69732
ISSN
0232-1300
DOI
10.1002/crat.201200454
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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