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Vertical growth and resonator properties of hexagonally shaped zinc oxide nanonails

Liu, Jinzhang, Lee, Soonil, Park, Kyung Ho, Ahn, YeongHwan, Park, Ji-Yong, & Koh, Ken Ha (2010) Vertical growth and resonator properties of hexagonally shaped zinc oxide nanonails. Journal of Nanoscience and Nanotechnology, 10(9), 6150--6154(5).

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Abstract

We synthesized vertically aligned nail-shaped ZnO nanocrystal arrays on silicon substrates via a combination of a carbothermal reduction method and textured ZnO seeding layers that were precoated on silicon substrates by thermally decomposing zinc acetate, and studied their optical properties using cathodoluminescence (CL) and photoluminescence techniques. The ZnO nanonails show a sharp band-gap edge UV emission and a defect-related broad green emission. Monochromatic CL images of an individual ZnO nanonail show variations in spatial distributions of respective CL bands that had different origins. We attribute the spatial variation of CL images to an uneven distribution of luminescent defects and/or a structure-related light out-coupling from hexagonal ZnO nanostructures. The most distinct CL feature from the hexagonal head of an individual ZnO nanonail was the occurrence of a series of distinct resonant peaks within the visible wavelength range. It appeared that the head of a nanonail played the role of a hexagonal cavity so that polarizationdependent whispering gallery modes were stimulated by electron beam excitation.

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ID Code: 46051
Item Type: Journal Article
Keywords: ZnO, Nanonails, Wispering Gallery Mode Resonances, Cathodoluminescence, Vapor-phase growth
DOI: 10.1166/jnn.2010.2569
ISSN: 1533-4880
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > CONDENSED MATTER PHYSICS (020400) > Condensed Matter Imaging (020402)
Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OPTICAL PHYSICS (020500) > Lasers and Quantum Electronics (020502)
Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OPTICAL PHYSICS (020500) > Photonics Optoelectronics and Optical Communications (020504)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Functional Materials (091205)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Engineering Systems
Copyright Owner: Copyright 2010 American Scientific Publishers
Deposited On: 19 Sep 2011 22:37
Last Modified: 21 Sep 2011 14:47

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