Development of a microemulsion-based process for synthesis of cobalt (Co) and cobalt oxide (Co3O4) nanoparticles from submicrometer rods of cobalt oxalate

Jahangeer Ahmed, Tokeer Ahmad, Kandalam V. Ramanujachary, Samuel E. Lofland, Ashok K. Ganguli

Research output: Contribution to journalArticlepeer-review

88 Scopus citations

Abstract

Rod-shaped nanostructures of cobalt oxalate dihydrate were synthesized at room temperature by the microemulsion (reverse micellar) route. These rods are highly uniform in length and can be modified with temperature (from ∼6.5 μm at 50 °C to ∼2.5 μm at 150 °C) while keeping the diameter nearly constant (200-250 nm). Thermal decomposition of these rods in a controlled atmosphere (air and H2) leads to nanoparticles of Co3O4 and Co, respectively, while in a helium atmosphere a mixture of Co and CoO nanoparticles is obtained. Co3O4 nanoparticles (∼35 nm) were slightly agglomerated, while Co nanoparticles were monodispersed and highly uniform (∼25 nm). The oxalate rods and Co3O4 nanoparticles show an antiferromagnetic ordering at 54 and 35 K, respectively.

Original languageEnglish (US)
Pages (from-to)434-441
Number of pages8
JournalJournal of Colloid And Interface Science
Volume321
Issue number2
DOIs
StatePublished - May 15 2008

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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