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Effect of electrolyte age and potential changes on the morphology of TiO2 nanotubes
Authors: Sopha Hanna Ingrid | Hromádko Luděk | Nechvílová Kateřina | Macák Jan
Year: 2015
Type of publication: článek v odborném periodiku
Name of source: Journal of Electroanalytical Chemistry
Publisher name: Elsevier Science SA
Place: Lausanne
Page from-to: 122-128
Titles:
Language Name Abstract Keywords
cze Vliv stáří elektrolytů a případných změn na morfologii TiO2 nanotrubek Tato práce se zabývá vlivem stáří elektrolytu na bázi ethylen glykou na syntézu vrstev TiO2 nanotrubic. elektrolyt;anodizace;adheze; TiO2; nanotrubky
eng Effect of electrolyte age and potential changes on the morphology of TiO2 nanotubes In the present work we report on the influence of the age of ethylene glycol-based electrolytes on the synthesis of self-organized TiO2 nanotube layers. Electrolytes of different ages, defined by the total duration for anodization, were explored in order to get an insight into how the tube structure changes with the electrolyte age. The results show a strong dependence of the electrolyte age upon the nanotube length and diameter - a phenomenon surprisingly not discussed in existing literature. When fresh electrolytes are employed, nanotube arrays with a high aspect ratio are received, while in older electrolytes (i.e. already used for anodization) the nanotube arrays exhibit low aspect ratios. This is a very important aspect for the reproducible synthesis of the nanotube layers. Moreover, the effect of the potential on the nanotube dimensions was investigated. Linear dependence of the diameter upon the potential was observed. Last, but not least, the influence of a potential change towards the end of the anodization time was studied. By sweeping the potential to 100 V, or to 5 V and keeping this for 1 h after applying a constant potential of 60 V for 4 h, nanotubes underwent interesting morphological changes. In particular, when slow sweeping from 60 V to 5 V was carried out, small nanotubes grew in the gaps between the initial nanotubes. Interestingly, these nanotube layers showed lower adhesion to the underlying substrates. Titanium dioxide;Nanotubes;Anodization;Electrolyte age;Adhesion

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