Chelation-mediated aqueous synthesis of metal oxyhydroxide and oxide nanostructures: Combination of ligand-controlled oxidation and LigandCooperative morphogenesis

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Abstract

We have synthesized nanostructures of iron and cobalt oxyhydroxides and manganese oxides in aqueous solution containing a chelating agent. Nanosheets of FeOOH and NaxMnO2 and nanoflakes of CoOOH were generated from the corresponding divalent metal salts and ethylenediam-inetetraacetate (EDTA) by one-pot synthesis under ambient conditions. The chelating agent fulfilled multiple roles in the reaction process and morphogenesis leading to two-dimensional nanostructures. Coordination to the divalent metal ions inhibited rapid precipitation of metal hydroxides and mediated oxidation to tri- and tetravalent species by dissolved oxygen. Along with the deposition, the two-dimensional and single-crystal nanostructures were also associated with interactions of the chelating agent. Therefore, this approach can be regarded as a combination of ligand-controlled oxidation and ligand-cooperative morphogenesis. Parallel control of the reaction and the morphology was achieved by a simple approach. The model cases suggest that tailoring chelation can facilitate the design of other metal oxide nanomaterials.

Original languageEnglish
Pages (from-to)8564-8571
Number of pages8
JournalChemistry - A European Journal
Volume13
Issue number30
DOIs
Publication statusPublished - 2007 Oct 26

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Keywords

  • Aqueous synthesis
  • Biomimetic synthesis
  • Chelates
  • Crystal growth
  • Nanostructures

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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