Controlling heterogenite particle morphology and microstructure by varying synthetic conditions

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13 Scopus citations

Abstract

This work presents results demonstrating control over heterogenite (β-CoOOH) nanoparticle properties through modifications to the synthetic preparation method. The particles are prepared by first precipitating cobalt (II) hydroxide, followed by oxidation to form heterogenite. The temperature during the synthesis yields control over the size and phase of the precursor cobalt (II) hydroxide particles generated, and the choice of oxidizing agent (H2O2 or NaOCl) yields the greatest degree of control over the transformation from precursor to product. Oxidization by H 2O2 results in heterogenite crystallites that are substantially smaller than the precursor Co(OH)2 particles, preserving very little of the Co(OH)2 morphology and structure. Oxidization by NaOCl, in contrast, leaves intact features such as the shape and size of the Co(OH)2 particles as well as preserves the intercalation of anions such as chloride.

Original languageEnglish (US)
Pages (from-to)649-657
Number of pages9
JournalMaterials Research Bulletin
Volume46
Issue number5
DOIs
StatePublished - May 2011

Bibliographical note

Funding Information:
Role of the funding source: Funding for this work was provided by the University of Minnesota and the National Science Foundation. These sources had no involvement in the study design, decision to publish, or the collection, analysis, and interpretation of the data.

Funding Information:
We thank the University of Minnesota and the National Science Foundation ( Career-036385 and MRI EAR-0320641 ) for funding to support this work. Portions of this work were conducted at the Characterization Facility, University of Minnesota, which receives support from the NSF through the National Nanotechnology Infrastructure Network.

Keywords

  • A. Oxides
  • B. Chemical synthesis
  • B. Crystal growth
  • C. Electron microscopy
  • D. Microstructure

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