Bacteria-mediated synthesis of free-standing cobalt oxide rods

Hyun Woo Shim, Chang Soo Lee, Dong Wan Kim

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


We demonstrate the simple room-temperature preparation of rod-type, oxide nanostructures derived from the Bacillus subtilis templates. Specifically, free-standing, cobalt oxide rods were produced via the following systematic processes: incubation of the bacteria templates in aqueous cobalt chloride solution, reduction with sodium borohydride (NaBH 4), and subsequent oxidation in water at room temperature. We observed that single nanocrystals or small clusters approximately 3 to 5 nm in diameter were uniformly distributed on the as-prepared individual rods. Additionally, thermogravimet-ric (TG) analysis and field emission electron scanning microscopy (FESEM) observation revealed the important role played by the concentration of the reductant, NaBH 4, in anchoring the cobalt oxide nanocrystals on the bacterial cell surface. Our proposed strategy facilitates the economic and easy construction of other oxide nanostructures and assemblies for applications in nanoelectronics, photonics, sensing, catalysis, and energy storages.

Original languageEnglish
Pages (from-to)1129-1134
Number of pages6
JournalJournal of Nanoscience and Nanotechnology
Issue number2
Publication statusPublished - 2010 Feb
Externally publishedYes


  • Bacteria
  • Cobalt oxide rods
  • Electrostatic interaction
  • Nanostructures

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • Biomedical Engineering
  • General Materials Science
  • Condensed Matter Physics


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