Untitled

Kamkin, A. N.; Fishgoit, L. A.; Давыдов, А. Д.

doi:10.1023/a:1024113613516

Cited by 8 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…19 By averaging the V * values for different wavelengths, a V FB Х −0.55 ± 0.05 V͑SCE͒ has been assumed for the anodic oxide on the Al-53 atom % Ti alloys. V FB estimated for the anodic film on Al-53 atom % Ti alloy is more cathodic than that reported for thin anodic films on a Al-50 atom % Ti alloy, 32 obtained by fitting the photocharacteristics in a rather limited region of electrode potentials with n = 2. Such a value of n, usually predicted for crystalline semiconductors, occurs with amorphous semiconductors with appropriate distributions of states within the gap and collection lengths.…”

Section: B520mentioning

confidence: 92%

Effect of Composition on the Photoelectrochemical Behavior of Anodic Oxides on Binary Aluminum Alloys

Santamaria

Quarto

Skeldon

et al. 2006

J. Electrochem. Soc.

View full text Add to dashboard Cite

The photoelectrochemical behavior of anodic films on Al alloys, containing titanium, tantalum, and tungsten ͑valve metals͒, has been studied as a function of alloy composition and anodizing conditions. Photocurrent spectroscopy has been used to get information on bandgap and the flatband potential values of different mixed oxides. Both insulator-like and semiconducting behavior has been observed for anodic oxides grown on Al-W and Al-Ti alloys dependent on alloy initial composition. Anodic films on valve metals alloys are of interest for investigating mechanisms of oxide growth; different works 1-6 have mainly focused their attention toward their morphology, structure, and composition to get insights on mechanism of anodic oxidation and ionic transport in "mixed oxides." Because these films are also of interest for possible application in electronics, for instance in metal-oxide semiconductor junctions [7][8][9][10][11][12] or in dye-sensitized photoelectrochemical and solid-state solar cells, 13,14 the possibility of controlled modification of the solid-state properties, such as bandgap, flatband potential, and dielectric constant, by use of "mixed oxides," is appealing from practical and theoretical viewpoints. This aspect becomes more important if we consider the prominent role of the solid-state properties of passive layers in controlling also the pitting behavior of metals and alloys. [15][16][17] Notably, it has been proposed that the bandgaps of crystalline binary oxides correlate with the electronegativities of their constituents, thus suggesting the possibility to predict the bandgaps of ternary oxides, 18-20 using an average electronegativity parameter for the cationic group and hence, tailoring of oxide properties. The correlation can apply also to amorphous oxides if account is taken of the influence of disorder on the optical bandgap value. 20,21 In the present work, a study of the solid-state properties of anodic films on several Al alloys was carried out by using photocurrent spectroscopy ͑PCS͒ to measure their bandgap and flatband potential. The validity of the above mentioned correlation was tested to get information about its applicability and limits. ExperimentalAl-23 atom % Ti, Al-53 atom % Ti, and Al-34 atom % Ta alloys, prepared by physical vapor deposition, and Al-W alloys, containing 15, 23, and 77 atom % W, prepared by dc magnetron sputtering, were anodized either potentiodynamically, at 100 mV s −1 , or galvanostatically, at 5 mA cm −2 in either 0.1/0.01 M ammonium pentaborate electrolyte ͑ABE͒, of pH 8.5, or 0.01 N H 2 SO 4 solution at room temperature. A three-electrode cell, with a saturated calomel electrode ͑SCE͒, and a two-electrode cell with a platinum cathode, were used in potentiodynamic and galvanostatic experiments, respectively.The composition of Al-W alloys and anodic oxides grown on them were analyzed by Rutherford backscattering spectroscopy ͑RBS͒, using 1.83 MeV He + ions supplied by the Van de Graaff accelerator of the University of Paris. The scattered ions were detect...

show abstract

Section: B520mentioning

confidence: 92%

Effect of Composition on the Photoelectrochemical Behavior of Anodic Oxides on Binary Aluminum Alloys

Santamaria

Quarto

Skeldon

et al. 2006

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…In the case of anodic oxide layers on TiAl alloys, the film is composed of (TiO 2 ) n and (Al 2 O 3 ) m , where m and n are the respective fractions of the base alloy Ti n Al m . [382] In some cases, minor amounts of mixed oxides may also be present in the anodic oxides. Full conversion to a mixed oxide was only reported for TiZr.…”

Section: Oxide Nanotube Layers On Other Transition Metals and Alloysmentioning

confidence: 99%

TiO₂ Nanotubes: Synthesis and Applications

2011

View full text Add to dashboard Cite

TiO(2) is one of the most studied compounds in materials science. Owing to some outstanding properties it is used for instance in photocatalysis, dye-sensitized solar cells, and biomedical devices. In 1999, first reports showed the feasibility to grow highly ordered arrays of TiO(2) nanotubes by a simple but optimized electrochemical anodization of a titanium metal sheet. This finding stimulated intense research activities that focused on growth, modification, properties, and applications of these one-dimensional nanostructures. This review attempts to cover all these aspects, including underlying principles and key functional features of TiO(2), in a comprehensive way and also indicates potential future directions of the field.

show abstract

“…Im Falle von anodischen Oxidschichten auf TiAl-Legierungen setzt sich der Film aus (TiO 2 ) n und (Al 2 O 3 ) m zusammen, wobei m und n jeweils für die entsprechenden Anteile der zugrundeliegenden Legierung Ti n Al m stehen. [382] In manchen Fällen können auch geringere Mengen an gemischten Oxiden in den anodischen Oxiden vorliegen. Eine vollständige Umwandlung in ein gemischtes Oxid wurde nur bei TiZr berichtet.…”

Section: Monolagenunclassified

TiO₂‐Nanoröhren: Synthese und Anwendungen

2011

View full text Add to dashboard Cite

TiO2 ist eine der am besten untersuchten Verbindungen in den Materialwissenschaften und weist einige herausragende Eigenschaften auf, die z. B. für die Photokatalyse, für farbstoffsensibilisierte Solarzellen oder für biomedizinische Funktionseinheiten genutzt werden. 1999 zeigten erste Berichte, dass es möglich ist, hoch geordnete Anordnungen von TiO2‐Nanoröhren durch eine einfache, aber optimierte elektrochemische Anodisierung einer Ti‐Metallfolie herzustellen. Dies löste intensive Forschungsaktivitäten aus, deren Schwerpunkt auf der Herstellung und der Modifizierung sowie auf den Eigenschaften und Anwendungen dieser eindimensionalen Nanostrukturen lagen. Dieser Aufsatz geht auf all diese Aspekte und die zugrundeliegenden Prinzipien und funktionellen Haupteigenschaften von TiO2 ein und will außerdem versuchen, Entwicklungsperspektiven für das Gebiet aufzuzeigen.

show abstract

Untitled

Cited by 8 publications

References 6 publications

Effect of Composition on the Photoelectrochemical Behavior of Anodic Oxides on Binary Aluminum Alloys

Effect of Composition on the Photoelectrochemical Behavior of Anodic Oxides on Binary Aluminum Alloys

TiO₂ Nanotubes: Synthesis and Applications

TiO₂‐Nanoröhren: Synthese und Anwendungen

Contact Info

Product

Resources

About

Untitled

Cited by 8 publications

References 6 publications

Effect of Composition on the Photoelectrochemical Behavior of Anodic Oxides on Binary Aluminum Alloys

Effect of Composition on the Photoelectrochemical Behavior of Anodic Oxides on Binary Aluminum Alloys

TiO2 Nanotubes: Synthesis and Applications

TiO2‐Nanoröhren: Synthese und Anwendungen

Contact Info

Product

Resources

About

TiO₂ Nanotubes: Synthesis and Applications

TiO₂‐Nanoröhren: Synthese und Anwendungen