Synthesis of Co3O4Nanopowder with Different Morphologies by Hydrothermal Treatment Followed by Decomposition

Abstract

Abstract: The powder of Co₃O₄with a cubic structure and well-developed hexagonal platelets were synthesized hydrothermally, followed by decomposition of the precursors in the Co(NO₃)₂-NH₃or KOH system. The results of XRD and TEM which were used to monitor the processes of hydrothermal treatment and calcination showed that NO₃^-played a key role in the formation of Co₃O₄with different morphologies. Co₃O₄with a cubic structure could be directly prepared hydrothermally from the system with NO₃^-. After the NO₃^-was rinsed from the system, a topotactic phenomena was observed. Well-developed hexagonal platelets of β-Co(OH)₂were obtained from the hydrothermal system, and then, being baked at 300 ℃ in air, β-Co(OH)₂was transformed into Co₃O₄with the same morphology as the precursor.

Key words: Hydrothermal synthesis, Cobalt oxide, Nano-powder

CLC Number:

O614

TrendMD:

ZHANG Wei-Min, SUN Si-Xiu, YU Hai-Yun, SONG Xin-Yu . Synthesis of Co₃O₄Nanopowder with Different Morphologies by Hydrothermal Treatment Followed by Decomposition[J]. Chem. J. Chinese Universities, 2003, 24(12): 2151.

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Synthesis of Co₃O₄Nanopowder with Different Morphologies by Hydrothermal Treatment Followed by Decomposition

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