Cobalt oxide (Co3O4) nanorings prepared from hexagonal β-Co(OH)2 nanosheets

Qiang Dong, Nobuhiro Kumada, Yoshinori Yonesaki, Takahiro Takei, Nobukazu Kinomura

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


Hexagonal cobalt hydroxide (β-Co(OH)2) nanosheets over a size range from 100 nm to 1 μm were synthesized using a very simple hydrothermal route with cobalt naphthenate as the cobalt source. Additionally, hexagonal cobalt oxide (Co3O4) nanorings over a size range from 100 nm to 1 μm consisting of cubic nanocrystals were obtained via a hydrothermal method using as-prepared β-Co(OH)2 nanosheets as the precursors. A probable mechanism of formation of the hexagonal Co 3O4 nanorings is proposed on the basis of time-dependent experimental results.

Original languageEnglish
Pages (from-to)1156-1162
Number of pages7
JournalMaterials Research Bulletin
Issue number8
Publication statusPublished - 2011 Aug
Externally publishedYes


  • A. Nanostructures
  • A. Oxides
  • B. Chemical synthesis
  • B. Crystal growth
  • D. Electrochemical properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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