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The present work investigates anodic oxide layers on Ti-Zr, Ti-Ta and Ti-Al alloys, focusing on how chemical compositions of the alloys and metallurgical textures can affect the resulting morphology of anodic oxide layers. The formation... more
The present work investigates anodic oxide layers on Ti-Zr, Ti-Ta and Ti-Al alloys, focusing on how chemical compositions of the alloys and metallurgical textures can affect the resulting morphology of anodic oxide layers. The formation of porous and tubular oxide layers is achieved on ...
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... Feature Article. Self-organized TiO 2 nanotubes: Factors affecting their morphology and properties. Steffen Berger,; Robert Hahn,; Poulomi Roy,; Patrik Schmuki. Article first published online: 7 SEP 2010. DOI: 10.1002/pssb.201046373.... more
... Feature Article. Self-organized TiO 2 nanotubes: Factors affecting their morphology and properties. Steffen Berger,; Robert Hahn,; Poulomi Roy,; Patrik Schmuki. Article first published online: 7 SEP 2010. DOI: 10.1002/pssb.201046373. ...
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ABSTRACT In the present work, we show that metallic Ti thin films on FTO glass can be completely anodized to a mesoporous oxide layer using a glycerol-K 2HPO 4 electrolyte at elevated temperatures (∼180 °C). This results in highly... more
ABSTRACT In the present work, we show that metallic Ti thin films on FTO glass can be completely anodized to a mesoporous oxide layer using a glycerol-K 2HPO 4 electrolyte at elevated temperatures (∼180 °C). This results in highly transparent mesoporous oxide coated electrodes that provide a significantly enhanced transparency compared with the classic nanoparticle layers or TiO 2 nanotube layers. We show that in electrochromic switching experiments these electrodes therefore exhibit a significantly higher contrast compared to other TiO 2 nanostructures. Moreover, this type of anodic titania layer is produced in a fluoride-free electrolyte and adheres very well to the FTO glass, both features that are highly beneficial in view of an application in electrochromic devices. © 2012 The Royal Society of Chemistry.
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The present study examines the influence of surface pretreatment on the evolution of nanotubular (T) and nanoporous (P) oxide film morphologies on titanium foil anodized potentiostatically, at , in fluoride-containing electrolyte. The... more
The present study examines the influence of surface pretreatment on the evolution of nanotubular (T) and nanoporous (P) oxide film morphologies on titanium foil anodized potentiostatically, at , in fluoride-containing electrolyte. The foil was used in the untreated, mechanically/ ...
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Self-organized nanostructured oxide materials that are grown by simple but optimized metal anodization have attracted remarkable interest in the past decades. Starting in 1995 with the anodic growth of nanoporous alumina, this type of... more
Self-organized nanostructured oxide materials that are grown by simple but optimized metal anodization have attracted remarkable interest in the past decades. Starting in 1995 with the anodic growth of nanoporous alumina, this type of oxide film can now be grown on ...
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This work reports on the optimized growth of self-ordered ZrO2 nanotubes in inorganic water-based and organic electrolyte systems containing small amounts of fluoride employing a two-step anodization process. We show how surface... more
This work reports on the optimized growth of self-ordered ZrO2 nanotubes in inorganic water-based and organic electrolyte systems containing small amounts of fluoride employing a two-step anodization process. We show how surface pretreatments of the metallic Zr substrate can drastically improve the growth and morphology of the resulting anodic ZrO2 nanotube arrays. Using two step anodization and employing organic electrolytes, highly regular and ordered nanotubular ZrO2 oxide layers can be grown to significantly increased tube lengths compared with aqueous electrolytes. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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The present work demonstrates that highly ordered porous anodic zirconia (PAZ) arrays with cell diameters ranging from 70 to 120 nm can be grown in fluoride containing glycerol electrolytes. We show that this morphology (in contrast to... more
The present work demonstrates that highly ordered porous anodic zirconia (PAZ) arrays with cell diameters ranging from 70 to 120 nm can be grown in fluoride containing glycerol electrolytes. We show that this morphology (in contrast to the typically observed ...
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Self-ordering effects in anodic oxides on refractory metals are observed in two distinct morphologies: (i) highly ordered parallely aligned porous oxide structures and (ii) ordered arrays of oxide nanotubes. The most prominent example... more
Self-ordering effects in anodic oxides on refractory metals are observed in two distinct morphologies: (i) highly ordered parallely aligned porous oxide structures and (ii) ordered arrays of oxide nanotubes. The most prominent example showing a self-ordered nanoporous ...
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Self-organized nanotubular layers of ZrO2 are electrochemically grown by tailored anodization in an (NH4)2SO4 electrolyte containing small amounts of fluoride ions. The structure and morphology of these nanotubular layers were... more
Self-organized nanotubular layers of ZrO2 are electrochemically grown by tailored anodization in an (NH4)2SO4 electrolyte containing small amounts of fluoride ions. The structure and morphology of these nanotubular layers were characterized by electron microscopy. XRD-measurements revealed anodic ZrO2 films to be crystalline. Luminescence properties were investigated by photoluminescence and cathodoluminescence measurements. In both methods a very bright white luminescence of as-grown ZrO2 nanotubes is observed. While the origin of this luminescence is not entirely clear, the findings may provide a path towards optoelectronic applications of ZrO2 nanotubes.
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In this paper we address several key aspects to the formation mechanism of self-organized oxide nanotube layers grown by anodization of valve metals and their alloys in fluoride ion containing electrolytes. We suggest that the... more
In this paper we address several key aspects to the formation mechanism of self-organized oxide nanotube layers grown by anodization of valve metals and their alloys in fluoride ion containing electrolytes. We suggest that the self-organized structure is produced as a result of an ...
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Within the last decade, the fabrication of self-organized anodic oxide nanostructures has stimulated a steadily increasing interest. This is due to the ease of their fabrication and the wide range of possible applications of various... more
Within the last decade, the fabrication of self-organized anodic oxide nanostructures has stimulated a steadily increasing interest. This is due to the ease of their fabrication and the wide range of possible applications of various nanostructure morphologies that can be produced. Up to ...