A novel method for synthesis of titania nanotube powders using rapid breakdown anodization

F. Fahim Narges, Tohru Sekino

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

The present paper describes a new method utilizing rapid anodization to quickly synthesize highquality, high aspect ratio, robust titanium dioxide nanotube powders. TiO2 nanotube powders, with a typical nanotube outer diameter of approximately 40 nm, wall thickness of approximately 8-15 nm, and length of about 10-35 μm, were synthesized by potentiostatic rapid breakdown anodization of titanium foils in aqueous electrolytes of 0.3 M NaCl or 0.1 M HClO4 under an applied potential of 20 V. High reactivity and ultrahigh reaction rate are cornerstones responsible for periodic release of TiO2 nanotubes into solution and formation of a white precipitate of TiO2 nanotubes. The reaction yield is approximately 4-6 g in less than 3 h, and the approximate cost of the material is $3.50/g, based on the laboratory-scale production. Various characterization techniques, including FESEM, HRTEM, EDX, XRD, XPS, FT-IR, UV-visible diffuse-reflectance, and N2 adsorption, have been used to probe morphology, microstructure, cry allographic, composition, bond configuration, optical properties, and surface area of the nanotubes. XPS and EDX investigations show that nanotubes formed in NaCl/phosphate electrolyte solutions contain a significant amount of phosphorus species, which strongly affects crystallization and phase transformation of TiO2. Namely, phosphate-incorporating nanotubes stabilized the anatase phase, and initiation of the rutile phase was observed at annealing temperatures ≥700 °C. The resulting nanotube powders have a significant level of OH groups with a band gap ranging from 3.04 to 3.23 eV. Our results indicate that rapid breakdown anodization is highly efficient in the production of good-quality TiO2 nanotube powders, which makes it an alternative to well-documented conventional methods.

Original languageEnglish
Pages (from-to)1967-1979
Number of pages13
JournalChemistry of Materials
Volume21
Issue number9
DOIs
Publication statusPublished - 2009 May 12

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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