Bacteria-Mediated Synthesis of Free-Standing Cobalt Oxide Rods
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 (NaBH4), 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, thermogravimetric (TG) analysis and field emission electron scanning microscopy (FESEM) observation revealed the important role played by the concentration of the reductant, NaBH4, 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.
Keywords: BACTERIA; COBALT OXIDE RODS; ELECTROSTATIC INTERACTION; NANOSTRUCTURES
Document Type: Research Article
Publication date: 01 February 2010
- Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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