Self-ordered Porous Alumina Fabricated via Phosphonic Acid Anodizing

Shunta Akiya, Tatsuya Kikuchi, Shungo Natsui, Norihito Sakaguchi, Ryosuke O. Suzuki

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


Self-ordered periodic porous alumina with an undiscovered cell diameter was fabricated via electrochemical anodizing in a new electrolyte, phosphonic acid (H3PO3). High-purity aluminum plates were anodized in phosphonic acid solution under various operating conditions of voltage, temperature, concentration, and anodizing time. Phosphonic acid anodizing at 150-180 V caused the self-ordering behavior of porous alumina, and an ideal honeycomb nanostructure measuring 370-440 nm in cell diameter was successfully fabricated on the aluminum substrate. Conversely, disordered porous alumina grew at below 140 V, and anodizing at above 190 V caused local thickening due to oxide burning. Two-step phosphonic acid anodizing allows the fabrication of high aspect ratio ordered porous alumina. HPO32- anions originated from the electrolyte were incorporated into the porous oxide during anodizing. Consequently, a double-layered porous alumina consisting of a thick outer layer containing incorporated HPO32- anions, and a thin inner layer without anions was constructed via phosphonic acid anodizing.

Original languageEnglish
Pages (from-to)471-479
Number of pages9
JournalElectrochimica Acta
Publication statusPublished - 2016 Feb 1
Externally publishedYes


  • Anodizing
  • Nanostructure
  • Phosphonic Acid
  • Porous Alumina
  • Self-ordering

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry


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