Effect of hydrogen on formation of nanoporous TiO2 by anodization with hydrogen-fluoride pretreatment

Hsin Chung Cheng, Sheng Yang Lee, Chih Mong Tsai, Chang Chih Chen, Keng Liang Ou

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

This study explores the effects of nano-(γ-TiH and δ-TiH 0.71) phases on the formation of nanoporous titanium oxide by anodization with HF pretreatment. The film characteristics were investigated by X-ray photoemission spectra, thin-film X-ray diffraction, transmission and electron scanning microscopy. Titanium hydride was a sacrificial barrier on titanium following HF pretreatment. The sacrificial barrier has nano-(γ-TiH and δ-TiH0.71) phases. The titanium hydrides, γ-TiH and δ-TiH0.71 with a tetragonal and an orthorhombic structure, respectively, were formed within titanium matrices during cathodization. The nanophases are directly dissolved after anodization. Nanoporosity and oxidation followed from phase transformations and dissolution reactions of the nanophases. The nano-(γy-TiH and δ-TiH 0.71) phases have important roles in forming nanoporous TiO 2. Anodization with HF pretreatment not only induces a titanium hydride layer, but also forms nanostructural titanium oxide. Particle-like γ-hydride and granular δ-hydride were observed on the Ti matrix and grain boundaries. The γ-hydride has a tetragonal structure with lattice constant a = 0.421 nm, and the δ-hydride has an orthorhombic structure with lattice constant a = 0.434 nm. The (γ + δ-hydride) microstructure was present on titanium grain boundaries. In the (α + γ) matrix, an α → γ → δ transition occurred during cathodization. This result has never been previously reported. The surface that contains nanophases (γ + δ-hydride) is readily dissolved in alkaline solution, so anodization for a short time at room temperature yields nanoporous TiO2. This fact is exploited to avoid having to prepare porous TiO2 by immersing Ti in an alkaline solution for a long time. As mentioned above, bioactive titanium with oxidation and nanostructures is believed to be capable of being prepared by anodization with HF pretreatment for a short time.

Original languageEnglish
JournalElectrochemical and Solid-State Letters
Volume9
Issue number11
DOIs
Publication statusPublished - 2006

Fingerprint

Hydrofluoric Acid
hydrofluoric acid
Hydrides
pretreatment
hydrides
Hydrogen
Titanium
titanium
hydrogen
Titanium oxides
titanium oxides
Lattice constants
Grain boundaries
matrices
grain boundaries
Oxidation
oxidation
Photoemission
activity (biology)
phase transformations

ASJC Scopus subject areas

  • Electrochemistry
  • Materials Science(all)

Cite this

Effect of hydrogen on formation of nanoporous TiO2 by anodization with hydrogen-fluoride pretreatment. / Cheng, Hsin Chung; Lee, Sheng Yang; Tsai, Chih Mong; Chen, Chang Chih; Ou, Keng Liang.

In: Electrochemical and Solid-State Letters, Vol. 9, No. 11, 2006.

Research output: Contribution to journalArticle

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