High-yield preparation of uniform cobalt hydroxide and oxide nanoplatelets and their characterization

Yanglong Hou, Hiroshi Kondoh, Masatsugu Shimojo, Toshihiro Kogure, Toshiaki Ohta

Research output: Contribution to journalArticlepeer-review

205 Citations (Scopus)


Cobalt hydroxide nanoplatelets with a uniform hexagonal shape were prepared in high yield (∼95%) by a facile hydrothermal route in the presence of poly(vinylpyrrolidone). This method provides a simple, low-cost, and large-scale route to produce β-cobalt hydroxide nanoplatelets with an average diameter of 280 nm and a thickness of ca. 26 nm which show a predominant well-crystalline hexagonal brucite-like phase. Their thermal decomposition produced anisotropic nanoplatelets of cobalt oxides (CoO and Co 3O4) under designed temperatures. The products were characterized by transmission electronic microscopy, selected-area electron diffraction, Fourier transform infrared spectroscopy, differential scanning calorimetric, and thermogravimetric analysis. The magnetic properties of the products were investigated by a superconducting quantum interference device magnetometer. Co3O4 nanoplatelets exhibit a superparamagnetic behavior, and they might be a promising material to study the magnetic tunneling effect as anisotropic nanostructures.

Original languageEnglish
Pages (from-to)19094-19098
Number of pages5
JournalJournal of Physical Chemistry B
Issue number41
Publication statusPublished - 2005 Oct 20
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


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