High-Aspect-Ratio Titanium Oxide Nanotubes Anodized in KH2PO4/NH4F/Citric Acid Electrolytes

Kim, Jong Oh; Yang, Dae Jin; Choi, Won Youl; Cho, Seong Je

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Emergence Change of Carbon Dioxide from Artificial Skin by Titania Photocatalyst, p.55
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Growth and Microstructure of Gallium Phosphide Nanowires Synthesized by the CVD Method Using Copper Oxide as a Catalyst, p.63
High-Aspect-Ratio Titanium Oxide Nanotubes Anodized in KH₂PO₄/NH₄F/Citric Acid Electrolytes, p.67
Hydrothermal Synthesis of Nanosized TiO₂ Using Basic Peptizing Agents and their Photocatalytic Activity on the Decomposition of Orange II, p.71
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Home > Materials Science Forum > Eco-Materials Processing and Design VIII > High-Aspect-Ratio Titanium Oxide Nanotubes...

Paper Title:

High-Aspect-Ratio Titanium Oxide Nanotubes Anodized in KH₂PO₄/NH₄F/Citric Acid Electrolytes

Periodical	Materials Science Forum (Volumes 544 - 545)
Main Theme	Eco-Materials Processing and Design VIII
Edited by	Hyungsun Kim, Junichi Hojo and Soo Wohn Lee
Pages	67-70
DOI	10.4028/www.scientific.net/MSF.544-545.67
Citation	Seong Je Cho et al., 2007, Materials Science Forum, 544-545, 67
Online since	May, 2007
Authors	Seong Je Cho, Jong Oh Kim, Dae Jin Yang, Won Youl Choi
Keywords	Anodization, Multi Step Voltage, Titanium Oxide Nanotubes
Price	US$ 28,-

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Abstract

Titanium of 99.7% purity was anodized in 1M potassium phosphate monobasic (KH2PO4) water solution with 0.15M NH4F. Titanium oxide nanotubes were fabricated at anodization potential of 20 V and 4.64 pH. To control the pH of the solution, we have added weak acid such as citric acid because it has three dissociation constants (pKa) of 3.09, 4.75, and 5.41. Citric acid was very useful to control the pH of the 1M KH2PO4 water electrolyte solution within 3 to 5. The diameter and length of the titanium oxide nanotubes were independent on anodization time. The diameter of 120 nm and length of 2.8 μm at anodization time of 5 hrs were observed by field emission scanning electron microscope (FESEM). Undesired thin oxide layer blocking the top of titanium oxide nanotubes was wiped out by increasing the anodization potential with the multi step voltage by 1 V reached to 25 V. The titanium oxide nanotubes having a very large surface area are very attractive for the battery, gas sensor, photocatalytic application, and biomaterials.