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. 2015 Aug 21;5(3):1397–1417. doi: 10.3390/nano5031397

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© 2015 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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Content of potassium in obtained nanostructured oxide films from X-ray fluorescence (XRF). The general trend for content of potassium in nanostructures is remarkably similar with Ti and TAV series. However, the overall tendency of the K content in the TN series is shifted toward higher KOH concentration regions. The value of 10 mol/L-KOH-treated TN was below the limit of the measurement and therefore not visible, and cannot be seen in the figure. The shortage of Ti content can be compensated for by using higher concentrations of KOH solution, which promotes nanowires formation.