Nano Archive

Template-Free Synthesis of Self-Assembled Co3O4 Micro/Nanocrystals

Amutha, Ramakrishnan and Akilandeswari, S. and Muruganandham, Manickavachagam and Sillanpää, Mika and Ahmmad, Bashir and Ohkubo, Takahiro (2010) Template-Free Synthesis of Self-Assembled Co3O4 Micro/Nanocrystals. Journal of Nanoscience and Nanotechnology, 11 . pp. 3171-3179.

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In this article, we have reported the fabrication of various morphological porous Co3O4 by thermal decomposition of cobalt oxalate at open atmospheric conditions. Uniform cobalt oxalate microrods and microneedles were synthesized without using any surfactants or templates in large scale. The cobalt oxalate preparation method was played a crucial role on the crystal structure and its morphology. The as prepared cobalt oxalates and its corresponding cobalt oxides were characterized by using the thermogravimetric analysis, X-ray diffraction (XRD), field-emission scanning electron microscope (FE-SEM), transmission electron microscopy (TEM) and nitrogen adsorption analysis. The XRD results indicated that the orthorhombic and monoclinic cobalt oxalates were formed in different experimental conditions. The influence of preparation method of cobalt oxalates and cobalt precursors on the final morphology has been investigated. The M–H loop of the Co3O4 porous microrods and microneedles showed the presence of paramagnetic properties at room temperatures. A plausible mechanism of both cobalt oxalates and Co3O4 formation was proposed based on the experimental results.

Item Type:Article
Subjects:Material Science > Nanochemistry
Material Science > Nanostructured materials
ID Code:11725
Deposited By:Prof. Mika Sillanpää
Deposited On:13 Jan 2012 13:23
Last Modified:13 Jan 2012 13:23

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