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Chemical composition and structural changes of porous templates obtained by anodising aluminium in phosphoric acid electrolyte

Le Coz, François and Arurault, Laurent and Fontorbes, Sandra and Vilar, Virginie and Datas, Lucien and Winterton, Peter James Chemical composition and structural changes of porous templates obtained by anodising aluminium in phosphoric acid electrolyte. (2010) Surface and Interface Analysis, 42 (4). 227-233. ISSN 0142-2421

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Official URL: http://dx.doi.org/10.1002/sia.3199


Ordered anodic aluminium oxide (AAO) filmswere first prepared by anodising in a phosphoric acid electrolyte and then studied extensively and characterised by field emission gun-scanning electron microscopy (FEG-SEM), X-ray diffraction, Raman and infrared spectroscopy at a macroscopic scale. These analyses showed that the as-prepared AAO film is in fact amorphous, partially hydrated and that its initial global chemical composition can be described, in agreement with previous works, as: Al2O3, 0.186AlPO4 · 0.005H2O. Additional analyses (thermogravimetric analysis, differential thermal analysis and FEG-SEM) showed geometrical changes of the film structure at different scales, explained by various steps of dehydration and allotropic transformations of the resulting crystallised alumina. However, because their structure remains unchanged up to 900 ◦C, the phosphoric templates appear to be particularly suitable for applications or processes atmedium or high temperatures, such as the preparation of carbon nanotubes or oxide rods.

Item Type:Article
Additional Information:Thanks to John Wiley & Sons editor. The definitive version is available at http://eu.wiley.com/ The original PDF of the article can be found at Surface and Interface Analysis website : http://www3.interscience.wiley.com/journal/123286932/abstract?CRETRY=1&SRETRY=0
HAL Id:hal-03557562
Audience (journal):International peer-reviewed journal
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Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
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Deposited On:26 Jan 2011 11:52

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