Control of morphology and nucleation density of iron oxide nanostructures by electric conditions on iron surfaces exposed to reactive oxygen plasmas

Cvelbar, U., Ostrikov, K., Levchenko, I., Mozetic, M., & Sunkara, M. K. (2009) Control of morphology and nucleation density of iron oxide nanostructures by electric conditions on iron surfaces exposed to reactive oxygen plasmas. Applied Physics Letters, 94(21), pp. 211502-1.

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Abstract

The possibility to control the morphology and nucleation density of quasi-one-dimensional, single-crystalline α -Fe2 O3 nanostructures by varying the electric potential of iron surfaces exposed to reactive oxygen plasmas is demonstrated experimentally. A systematic increase in the oxygen ion flux through rf biasing of otherwise floating substrates and then an additional increase of the ion/neutral density resulted in remarkable structural transformations of straight nanoneedles into nanowires with controlled tapering/aspect ratio and also in larger nucleation densities. Multiscale numerical simulations relate the microscopic ion flux topographies to the nanostructure nucleation and morphological evolution. This approach is applicable to other metal-oxide nanostructures.

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ID Code: 73758
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: Nucleation, Plasma temperature, Nanowires, Surface morphology, Surface phase transitions
DOI: 10.1063/1.3147193
ISSN: 1077-3118
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2009 American Institute of Physics (AIP)
Deposited On: 11 Jul 2014 00:18
Last Modified: 14 Jul 2014 03:25

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