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Fractal Dimensions of Niobium Oxide Films Probed by Protons and Lithium Ions
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.ORCID iD: 0000-0002-8279-5163
2006 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 100, no 5, p. 053506-Article in journal (Refereed) Published
Abstract [en]

Cyclic voltammetry (CV) and atomic force microscopy (AFM) were used to determine fractal surface dimensions of sputter deposited niobium pentoxide films. Peak currents were determined by CV measurements. Power spectral densities obtained from AFM measurements of the films were used for calculating length scale dependent root mean square roughness. In order to compare the effect of Li and H ion intercalation at the fractal surfaces, LiClO4 based as well as propionic acid electrolytes were used. The CV measurements gave a fractal dimension of 2.36 when the films were intercalated by Li ions and 1.70 when the films were intercalated by protons. AFM measurements showed that the former value corresponds to the fractal surface roughness of the films, while the latter value is close to the dimensionality of the distribution of hillocks on the surface. We conclude that the protons are preferentially intercalated at such sites.

Place, publisher, year, edition, pages
2006. Vol. 100, no 5, p. 053506-
National Category
Condensed Matter Physics Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-26091DOI: 10.1063/1.2337164ISI: 000240602500038OAI: oai:DiVA.org:uu-26091DiVA, id: diva2:53865
Available from: 2011-09-29 Created: 2007-02-14 Last updated: 2017-12-07Bibliographically approved

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Pehlivan, EsatNiklasson, Gunnar A.
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