Effect of water and fluoride content on morphology and barrier layer properties of TiO<inf>2</inf>nanotubes grown in ethylene glycol-based electrolytes

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Abstract

This paper studies the effect of H2O and NH4F content on morphology and barrier layer properties of TiO2nanotubes grown by potentiostatic anodization in ethylene glycol-based electrolytes. The increase in these two variables leads to an increase in the chemical attack of the formed oxide. However, each of these variables plays a different role in the formation of TiO2nanotubes. On the one hand, a higher percentage of H2O in the electrolyte leads to a transition from a nanoporous to a nanotubular structure, as well as to a greater diameter of the tubes and a decrease in their length and barrier layer thickness. In contrast, a higher NH4F concentration decreases nanotube diameter and increases their length modifying barrier layer properties due to insertion of F-ions into the lattice. This diminishes the barrier layer resistance, but increases both the adsorption and the diffusion coefficient of F-ions. The different roles of H2O and NH4F in film formation are also associated with the presence of sub-oxides detected by XPS. © 2013 Springer-Verlag Berlin Heidelberg.
Original languageAmerican English
Pages (from-to)2939-2947
Number of pages2644
JournalJournal of Solid State Electrochemistry
DOIs
StatePublished - 1 Nov 2013

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Ethylene Glycol
barrier layers
Ethylene glycol
Fluorides
fluoride
electrolyte
Oxides
Electrolytes
ethylene
moisture content
fluorides
glycols
electrolytes
Ions
Chemical attack
Water
Nanotubes
X ray photoelectron spectroscopy
chemical attack
oxide

Cite this

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title = "Effect of water and fluoride content on morphology and barrier layer properties of TiO2nanotubes grown in ethylene glycol-based electrolytes",
abstract = "This paper studies the effect of H2O and NH4F content on morphology and barrier layer properties of TiO2nanotubes grown by potentiostatic anodization in ethylene glycol-based electrolytes. The increase in these two variables leads to an increase in the chemical attack of the formed oxide. However, each of these variables plays a different role in the formation of TiO2nanotubes. On the one hand, a higher percentage of H2O in the electrolyte leads to a transition from a nanoporous to a nanotubular structure, as well as to a greater diameter of the tubes and a decrease in their length and barrier layer thickness. In contrast, a higher NH4F concentration decreases nanotube diameter and increases their length modifying barrier layer properties due to insertion of F-ions into the lattice. This diminishes the barrier layer resistance, but increases both the adsorption and the diffusion coefficient of F-ions. The different roles of H2O and NH4F in film formation are also associated with the presence of sub-oxides detected by XPS. {\circledC} 2013 Springer-Verlag Berlin Heidelberg.",
author = "Pr{\'o}spero Acevedo-Pe{\~n}a and Luis Lartundo-Rojas and Ignacio Gonz{\'a}lez",
year = "2013",
month = "11",
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journal = "Journal of Solid State Electrochemistry",
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TY - JOUR

T1 - Effect of water and fluoride content on morphology and barrier layer properties of TiO2nanotubes grown in ethylene glycol-based electrolytes

AU - Acevedo-Peña, Próspero

AU - Lartundo-Rojas, Luis

AU - González, Ignacio

PY - 2013/11/1

Y1 - 2013/11/1

N2 - This paper studies the effect of H2O and NH4F content on morphology and barrier layer properties of TiO2nanotubes grown by potentiostatic anodization in ethylene glycol-based electrolytes. The increase in these two variables leads to an increase in the chemical attack of the formed oxide. However, each of these variables plays a different role in the formation of TiO2nanotubes. On the one hand, a higher percentage of H2O in the electrolyte leads to a transition from a nanoporous to a nanotubular structure, as well as to a greater diameter of the tubes and a decrease in their length and barrier layer thickness. In contrast, a higher NH4F concentration decreases nanotube diameter and increases their length modifying barrier layer properties due to insertion of F-ions into the lattice. This diminishes the barrier layer resistance, but increases both the adsorption and the diffusion coefficient of F-ions. The different roles of H2O and NH4F in film formation are also associated with the presence of sub-oxides detected by XPS. © 2013 Springer-Verlag Berlin Heidelberg.

AB - This paper studies the effect of H2O and NH4F content on morphology and barrier layer properties of TiO2nanotubes grown by potentiostatic anodization in ethylene glycol-based electrolytes. The increase in these two variables leads to an increase in the chemical attack of the formed oxide. However, each of these variables plays a different role in the formation of TiO2nanotubes. On the one hand, a higher percentage of H2O in the electrolyte leads to a transition from a nanoporous to a nanotubular structure, as well as to a greater diameter of the tubes and a decrease in their length and barrier layer thickness. In contrast, a higher NH4F concentration decreases nanotube diameter and increases their length modifying barrier layer properties due to insertion of F-ions into the lattice. This diminishes the barrier layer resistance, but increases both the adsorption and the diffusion coefficient of F-ions. The different roles of H2O and NH4F in film formation are also associated with the presence of sub-oxides detected by XPS. © 2013 Springer-Verlag Berlin Heidelberg.

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