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Influence of ZnO nanowire array morphology on field emission characteristics

Garry, Seamus, McCarthy, Éanna, Mosnier, Jean-Paul orcid logoORCID: 0000-0002-9312-1754 and McGlynn, Enda orcid logoORCID: 0000-0002-3412-9035 (2014) Influence of ZnO nanowire array morphology on field emission characteristics. Nanotechnology, 25 (13). p. 135604. ISSN 0957-4484

Abstract
In this work the growth and field emission properties of vertically aligned and spatially ordered and unordered ZnO nanowires are studied. Spatially ordered nanowire arrays of controlled array density are synthesised by both chemical bath deposition and vapour phase transport using an inverse nanosphere lithography technique, while spatially unordered arrays are synthesised by vapour phase transport without lithography. The field emission characteristics of arrays with 0.5 µm, 1.0 µm, and 1.5 µm inter-wire distances, as well as unordered arrays, are examined, revealing that with the range of values examined field emission properties are mainly determined by variations in nanowire height, and show no correlation with nanowire array density. Related to this, we find that a significant variation in nanowire height in an array also leads to a reduction in catastrophic damage observed on samples during field emission because arrays with highly uniform heights are found to suffer significant arcing damage. We discuss these results in light of recent computational studies of comparable nanostructure arrays and find strong qualitative agreement between our results and the computational predictions. Hence the results presented in this work should be useful in informing the design of ZnO nanowire arrays in order to optimise their field emission characteristics generally.
Metadata
Item Type:Article (Published)
Refereed:Yes
Subjects:Engineering > Materials
Engineering > Electronics
Physical Sciences > Nanotechnology
Physical Sciences > Semiconductors
DCU Faculties and Centres:Research Initiatives and Centres > National Centre for Plasma Science and Technology (NCPST)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Publisher:Institute of Physics
Official URL:http://dx.doi.org/10.1088/0957-4484/25/13/135604
Copyright Information:© 2014 IOP
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:19878
Deposited On:07 Mar 2014 09:49 by Enda Mcglynn . Last Modified 07 Oct 2021 12:17
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