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Growth of spatially ordered ZnO nanowire arrays for field emission applications

Garry, Seamus (2013) Growth of spatially ordered ZnO nanowire arrays for field emission applications. PhD thesis, Dublin City University.

In this work the growth of spatially ordered and vertically aligned ZnO nanowires is examined. Nanowire arrays are grown using chemical bath deposition (CBD) and carbothermal reduction vapour phase transport (CTR-VPT) techniques. Nanosphere lithography (NSL) was used to achieve spatial ordering of these arrays; arrays with inter-wire distances of 500 nm, 1.0 μm, and 1.5 μm were grown using both CBD and CTR-VPT techniques. Two distinct implementations of the NSL technique are investigated, one which relied on the deposition of a catalyst material and one which involved the deposition of a secondary mask which prevents ZnO deposition from occurring in undesired areas. The field emission (FE) characteristics of these arrays were examined, revealing a significant dependence of the FE properties on both nanowire morphology and array density. A geometric factor is calculated which is dependent on both nanowire aspect ratio and the density of nanowires in an array and this factor has been found to correlate with other indicators of FE properties. The results presented in this work may be useful in informing the design of ZnO nanowire arrays in order to maximise their FE efficiency and uniformity.
Item Type:Thesis (PhD)
Date of Award:November 2013
Supervisor(s):McGlynn, Enda
Uncontrolled Keywords:ZnO; Nanostructures; Field emission; Growth; Characterisation
Subjects:Physical Sciences > Physics
Physical Sciences > Nanotechnology
Physical Sciences > Semiconductors
DCU Faculties and Centres:Research Institutes and Centres > National Centre for Plasma Science and Technology (NCPST)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 License. View License
Funders:Science Foundation Ireland
ID Code:17857
Deposited On:05 Dec 2013 11:24 by Enda Mcglynn . Last Modified 19 Jul 2018 14:58

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