TiO2–Nb2O5 Nanotubes with Electrochemically Tunable Morphologies

Ghicov, Andrei; Aldabergenova, S.B.; Tsuchyia, Hiroaki; Schmuki, Patrik

doi:10.1002/anie.200601957

Cited by 181 publications

(127 citation statements)

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“…Similar amorphous structure was recently observed after anodization of Ti6Al7Nb alloy [26]. However, in case of the alloy, Ghicov et al [31] demonstrated that the presence of another oxide in the oxide matrix enhances the stability of the crystallite phase. In our case, X-ray patterns obtained for as-anodized samples revealed also an amorphous oxide, which transformed into anatase at about 450°C.…”

Section: Polarization Measurementssupporting

confidence: 76%

Electrochemical synthesis of oxide nanotubes on Ti6Al7Nb alloy and their interaction with the simulated body fluid

Stępień

Handzlik

Fitzner

2016

J Solid State Electrochem

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The aim of the present work was to investigate electrochemical behavior of the Ti6Al7Nb alloy in the simulated body fluid (SBF) containing Ca 2+ , HCO 3 − , and HPO 4 2 − ions. At first, optimal conditions necessary for oxide nanotube formation were determined. The experiments were conducted in the 1 M (NH 4 ) 2 SO 4 with 0.5 wt% NH 4 F electrolyte at room temperature. Anodization of the alloy samples was carried out under variable external voltage U in the range from 10 to 40 V at room temperature. Obtained surface morphology was examined by SEM and X-ray techniques. Nanotube diameter was calculated and correlated with the imposed voltage. Having control over the size of nanotubes, samples with the obtained nanostructures of a chosen diameter were immersed into SBF solution with pH = 7.4 for a fixed period of time. Then, they were removed from the fluid and subjected to the electrochemical investigation. Corrosion current and corrosion potential were determined, and it was found that the best anticorrosion properties were obtained for heat-treated nanotube layer: i corr = 39 nA/cm 2 and E corr = −0.236 V vs Ag/AgCl. Finally, the interaction between the oxide surface and the solution was studied using polarization and electrochemical impedance spectroscopy (EIS) techniques.

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Section: Polarization Measurementssupporting

confidence: 76%

Electrochemical synthesis of oxide nanotubes on Ti6Al7Nb alloy and their interaction with the simulated body fluid

Stępień

Handzlik

Fitzner

2016

J Solid State Electrochem

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“…In this case, under some anodization conditions, tubes of two distinct different diameters were formed highly ordered and arranged. This effect was later also reported for a range of more simple binary [252][253][254][255] and ternary 256,257 alloys. The origin of this highly unusual effect is still not entirely clear.…”

Section: Bamboo Branched Stacks Multilayerssupporting

confidence: 66%

One-Dimensional Titanium Dioxide Nanomaterials: Nanotubes

2014

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“…1 More recently, by anodization of titanium in fluoride-containing electrolytes, it is possible to form a similar morphology, that is, self-aligned nanotube arrays. [4][5][6][7] Apart from Al and Ti, self-organized growth of nanoporous or nanotubular oxide structures have also been reported for other valve metals, such as Nb, 8,9 Zr, [10][11][12] Ta, [13][14][15] and W, 16 and alloys, such as TiAl, 17 TiNb, 18 TiZr, 19 TiW, 20 TiMo, 21 and TiTa. 22 Some elements, upon anodization in aqueous fluoride electrolyte, tend to form nanotubular structures such as Ti, Zr, and Hf, whereas others, e.g., Ta, Nb, and W, tend to form nanoporous structures.…”

mentioning

confidence: 92%

Ideal Hexagonal Order: Formation of Self-Organized Anodic Oxide Nanotubes and Nanopores on a Ti–35Ta Alloy

Wei

Berger

Shrestha

et al. 2010

J. Electrochem. Soc.

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In this work, we report on the formation of highly aligned nanoporous or nanotubular oxide structures by anodization of Ti-Ta alloys in NH 4 F containing ethylene glycol electrolytes. We show that depending on the anodization conditions, either a hexagonally self-organized nanoporous layer or a nanotube array can be formed. Critical factors that decide on tube or pore formation are the water content of the electrolyte and the applied voltage. The present approach provides hexagonally packed oxide structures with an order comparable to that of the gold standard, anodized alumina. Layers of thicknesses Ͼ10 m and individual pore diameter in the range of 27-50 nm can easily be produced. © 2010 The Electrochemical Society. ͓DOI: 10.1149/1.3490424͔ All rights reserved.Manuscript submitted August 13, 2010; revised manuscript received August 25, 2010. Published September 30, 2010 In the past few years, the electrochemical formation of selforganized nanoporous or nanotubular structures has attracted considerable attention from both the scientific and the technological community. Honeycomb-packed anodic Al 2 O 3 nanoporous films [1][2][3] represent one of the earliest and best-known examples for an almost ideal self-organizing electrochemical process. 1 More recently, by anodization of titanium in fluoride-containing electrolytes, it is possible to form a similar morphology, that is, self-aligned nanotube arrays. Some elements, upon anodization in aqueous fluoride electrolyte, tend to form nanotubular structures such as Ti, Zr, and Hf, whereas others, e.g., Ta, Nb, and W, tend to form nanoporous structures. Only very recently, first investigations were reported on the transition of the morphology from self-organized nanopore to nanotube structures depending on the specific anodization conditions. 12,17,23 In the present work, we investigate self-organizing anodization with an alloy that contains a typical tube formation element Ti and a typical pore formation element Ta. While in aqueous electrolytes, such an alloy forms only tubular structures, 22 we demonstrate in the present work that an organic electrolyte can induce transition to a porous structure with a virtually unprecedented degree of short-and longrange orders.Except for scientific interest in the feasibility of ordered oxide formation on these materials, Ti-Ta oxides are also of high technological significance. The oxide layers provide a very high corrosion resistance to surfaces, as Ta 2 O 5 is significantly more resistant than TiO 2 in almost any environment but particularly under cathodic reductive conditions. 24,25 Moreover, the alloy provides excellent biocompatibility but with a considerably lower average weight than pure Ta. Therefore, various Ti-Ta alloys are explored as candidates for biomedical implant materials. 26,27 In this context, the decoration of Ti implants with TiO 2 nanotubes has already shown a beneficial nature in view of cell response, 28,29 hydroxyapatite formation, 30 and for applications in drug delivery systems. 31,32 It is hence expe...

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TiO₂–Nb₂O₅ Nanotubes with Electrochemically Tunable Morphologies

Cited by 181 publications

References 36 publications

Electrochemical synthesis of oxide nanotubes on Ti6Al7Nb alloy and their interaction with the simulated body fluid

Electrochemical synthesis of oxide nanotubes on Ti6Al7Nb alloy and their interaction with the simulated body fluid

One-Dimensional Titanium Dioxide Nanomaterials: Nanotubes

Ideal Hexagonal Order: Formation of Self-Organized Anodic Oxide Nanotubes and Nanopores on a Ti–35Ta Alloy

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