Formation of self-organized titania nano-tubes by dealloying and anodic oxidation

Fathy M. Bayoumi; Badr G. Ateya

doi:10.1016/j.elecom.2005.10.014

Formation of self-organized titania nano-tubes by dealloying and anodic oxidation

Fathy M. Bayoumi, Badr G. Ateya

Research output: Contribution to journal › Article › peer-review

58 Citations (Scopus)

Abstract

The dealloying of a titanium aluminum alloy (Ti-8 at. % Al) in 1 M NaOH at a critical potential (E_c) generates an ordered nanoporous structure. The diameter of the pores ranges from 30 to 100 nm with highest population of 60 nm. This is attributed to selective dissolution of Al from the alloy while Ti remains passive. Much less developed nanopores were imaged on alloy surfaces at a potential that is 400 mV less noble than E_c. Subsequent anodization of the nanoporous dealloyed surface in 1 M H₃PO₄ + 1.0 - 1.5% HF yielded self-organized titania nanotubes of diameters ranging from 40 to 140 nm with highest population of 80 nm. An increase in the potential and time of anodization results in more developed nanotubes. The increase in the diameter scale of the nanostructure upon anodizing is attributed to the effect of fluoride ions and high potential on TiO₂. X-ray diffraction and thermogravimetric analyses revealed that the tubes are made of anatase (TiO ₂).

Original language	English
Pages (from-to)	38-44
Number of pages	7
Journal	Electrochemistry Communications
Volume	8
Issue number	1
DOIs	https://doi.org/10.1016/j.elecom.2005.10.014
Publication status	Published - Jan 2006
Externally published	Yes

Keywords

Anatase
Anodic oxidation
Dealloying
Nanoporous
Nanotubes

ASJC Scopus subject areas

Electrochemistry

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10.1016/j.elecom.2005.10.014

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title = "Formation of self-organized titania nano-tubes by dealloying and anodic oxidation",

abstract = "The dealloying of a titanium aluminum alloy (Ti-8 at. % Al) in 1 M NaOH at a critical potential (Ec) generates an ordered nanoporous structure. The diameter of the pores ranges from 30 to 100 nm with highest population of 60 nm. This is attributed to selective dissolution of Al from the alloy while Ti remains passive. Much less developed nanopores were imaged on alloy surfaces at a potential that is 400 mV less noble than Ec. Subsequent anodization of the nanoporous dealloyed surface in 1 M H3PO4 + 1.0 - 1.5% HF yielded self-organized titania nanotubes of diameters ranging from 40 to 140 nm with highest population of 80 nm. An increase in the potential and time of anodization results in more developed nanotubes. The increase in the diameter scale of the nanostructure upon anodizing is attributed to the effect of fluoride ions and high potential on TiO2. X-ray diffraction and thermogravimetric analyses revealed that the tubes are made of anatase (TiO 2).",

keywords = "Anatase, Anodic oxidation, Dealloying, Nanoporous, Nanotubes",

author = "Bayoumi, {Fathy M.} and Ateya, {Badr G.}",

note = "Funding Information: The authors would like to acknowledge the ?laser and additive manufacturing unit and Advanced Melting Unit? at Central Metallurgical Research and Development Institute, for supporting this work. They also would like to thank Prof. Khalid Abdelhany for his valuable assistance in this work. Funding Information: The authors would like to acknowledge the {"}laser and additive manufacturing unit and Advanced Melting Unit{"} at Central Metallurgical Research and Development Institute, for supporting this work. They also would like to thank Prof. Khalid Abdelhany for his valuable assistance in this work.",

year = "2006",

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doi = "10.1016/j.elecom.2005.10.014",

language = "English",

volume = "8",

pages = "38--44",

journal = "Electrochemistry Communications",

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AU - Bayoumi, Fathy M.

AU - Ateya, Badr G.

N1 - Funding Information: The authors would like to acknowledge the ?laser and additive manufacturing unit and Advanced Melting Unit? at Central Metallurgical Research and Development Institute, for supporting this work. They also would like to thank Prof. Khalid Abdelhany for his valuable assistance in this work. Funding Information: The authors would like to acknowledge the "laser and additive manufacturing unit and Advanced Melting Unit" at Central Metallurgical Research and Development Institute, for supporting this work. They also would like to thank Prof. Khalid Abdelhany for his valuable assistance in this work.

PY - 2006/1

Y1 - 2006/1

N2 - The dealloying of a titanium aluminum alloy (Ti-8 at. % Al) in 1 M NaOH at a critical potential (Ec) generates an ordered nanoporous structure. The diameter of the pores ranges from 30 to 100 nm with highest population of 60 nm. This is attributed to selective dissolution of Al from the alloy while Ti remains passive. Much less developed nanopores were imaged on alloy surfaces at a potential that is 400 mV less noble than Ec. Subsequent anodization of the nanoporous dealloyed surface in 1 M H3PO4 + 1.0 - 1.5% HF yielded self-organized titania nanotubes of diameters ranging from 40 to 140 nm with highest population of 80 nm. An increase in the potential and time of anodization results in more developed nanotubes. The increase in the diameter scale of the nanostructure upon anodizing is attributed to the effect of fluoride ions and high potential on TiO2. X-ray diffraction and thermogravimetric analyses revealed that the tubes are made of anatase (TiO 2).

AB - The dealloying of a titanium aluminum alloy (Ti-8 at. % Al) in 1 M NaOH at a critical potential (Ec) generates an ordered nanoporous structure. The diameter of the pores ranges from 30 to 100 nm with highest population of 60 nm. This is attributed to selective dissolution of Al from the alloy while Ti remains passive. Much less developed nanopores were imaged on alloy surfaces at a potential that is 400 mV less noble than Ec. Subsequent anodization of the nanoporous dealloyed surface in 1 M H3PO4 + 1.0 - 1.5% HF yielded self-organized titania nanotubes of diameters ranging from 40 to 140 nm with highest population of 80 nm. An increase in the potential and time of anodization results in more developed nanotubes. The increase in the diameter scale of the nanostructure upon anodizing is attributed to the effect of fluoride ions and high potential on TiO2. X-ray diffraction and thermogravimetric analyses revealed that the tubes are made of anatase (TiO 2).

KW - Anatase

KW - Anodic oxidation

KW - Dealloying

KW - Nanoporous

KW - Nanotubes

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Formation of self-organized titania nano-tubes by dealloying and anodic oxidation

Abstract

Keywords

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