Nucleation and early growth of anodized TiO2 film

A Jaroenworaluck, Domenico Regonini, Christopher Bowen, R Stevens

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Anodized films of titanium were prepared under different controlled conditions in a water-based electrolyte containing fluorine ions, using either a constant potential or a potential gradually rising to 20 V. The films were then examined using transmission electron microscopy at different stages of growth, in particular, the very early stages of growth (30 s, 200 s, and 10 min) and when the ordered nano-tubular structure was finally established (2–4 h). The use of ramped voltage during the early stages of anodization allowed a well-interconnected porous network to develop and maintained active oxidation throughout anodization. The film, as formed, consisted mainly of amorphous oxide/hydroxides of titanium with small regions of nano-sized crystals. These were found more often in the denser regions of the amorphous network, particularly the arms of the coral-like structure that formed. As the anodized film grew in thickness, the pores tended to become aligned, leading to a surface layer of nanotubes on the electrode material. Electron optical characterization revealed that the nanotubes consist of a stack of rings where the passage of the current had been optimized.
Original languageEnglish
Pages (from-to)2116-2124
Number of pages9
JournalJournal of Materials Research
Volume23
Issue number8
DOIs
Publication statusPublished - Oct 2008

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nucleation
nanotubes
titanium
electrode materials
hydroxides
fluorine
surface layers
electrolytes
porosity
transmission electron microscopy
oxidation
oxides
rings
electric potential
water
crystals
ions
electrons

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Nucleation and early growth of anodized TiO2 film. / Jaroenworaluck, A; Regonini, Domenico; Bowen, Christopher; Stevens, R.

In: Journal of Materials Research, Vol. 23, No. 8, 10.2008, p. 2116-2124.

Research output: Contribution to journalArticle

Jaroenworaluck, A, Regonini, D, Bowen, C & Stevens, R 2008, 'Nucleation and early growth of anodized TiO2 film', Journal of Materials Research, vol. 23, no. 8, pp. 2116-2124. https://doi.org/10.1557/JMR.2008.0276
Jaroenworaluck, A ; Regonini, Domenico ; Bowen, Christopher ; Stevens, R. / Nucleation and early growth of anodized TiO2 film. In: Journal of Materials Research. 2008 ; Vol. 23, No. 8. pp. 2116-2124.
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