Fabrication of a novel aluminum surface covered by numerous high-aspect-ratio anodic alumina nanofibers

Daiki Nakajima, Tatsuya Kikuchi, Shungo Natsui, Norihito Sakaguchi, Ryosuke O. Suzuki

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


The formation behavior of anodic alumina nanofibers via anodizing in a concentrated pyrophosphoric acid under various conditions was investigated using electrochemical measurements and SEM/TEM observations. Pyrophosphoric acid anodizing at 293 K resulted in the formation of numerous anodic alumina nanofibers on an aluminum substrate through a thin barrier oxide and honeycomb oxide with narrow walls. However, long-term anodizing led to the chemical dissolution of the alumina nanofibers. The density of the anodic alumina nanofibers decreased as the applied voltage increased in the 10-75 V range. However, active electrochemical dissolution of the aluminum substrate occurred at a higher voltage of 90 V. Low temperature anodizing at 273 K resulted in the formation of long alumina nanofibers measuring several micrometers in length, even though a long processing time was required due to the low current density during the low temperature anodizing. In contrast, high temperature anodizing easily resulted in the formation and chemical dissolution of alumina nanofibers. The structural nanofeatures of the anodic alumina nanofibers were controlled by choosing of the appropriate electrochemical conditions, and numerous high-aspect-ratio alumina nanofibers (>100) can be successfully fabricated. The anodic alumina nanofibers consisted of a pure amorphous aluminum oxide without anions from the employed electrolyte.

Original languageEnglish
Pages (from-to)54-62
Number of pages9
JournalApplied Surface Science
Publication statusPublished - 2015 Nov 30
Externally publishedYes


  • Aluminum
  • Anodic alumina nanofibers
  • Anodizing
  • Pyrophosphoric acid

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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