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Jinzhang Gao, Yanchun Zhao, Wu Yang, Jianniao Tian, Fei Guan., and Yongjun Ma, Sol-gel preparation and characterization of Co3O4 nanocrystals, J. Univ. Sci. Technol. Beijing , 10(2003), No. 1, pp.54-57.
Jinzhang Gao, Yanchun Zhao, Wu Yang, Jianniao Tian, Fei Guan., and Yongjun Ma, Sol-gel preparation and characterization of Co3O4 nanocrystals, J. Univ. Sci. Technol. Beijing , 10(2003), No. 1, pp.54-57.
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Sol-gel preparation and characterization of Co3O4 nanocrystals

摘要: A new citrate acid-hydrazine sol-gel route for preparation of Co3O4 nanoparticles has been developed. Co3O4 nanoparticles with different particle-sizes and morphology were prepared at different heat-treatment temperatures and the pure cubic nanocrystals of Co3O4 were obtained at 600℃. The synthesis process was monitored by infrared spectroscopy (IR), thermal gravimetric and differential thermal analysis (TG-DTA). The structure and morphology of Co3O4 nanocrystals were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and X-ray-photoelectron spectroscopy (XPS). The infrared absorption bands blue-shifted with particle size decreasing, which could be attributed to increasing surface effect. XPS results showed that predominant species at surface layers of Co3O4 nanocrystals are octahedral Co (Ⅲ).

 

Sol-gel preparation and characterization of Co3O4 nanocrystals

Abstract: A new citrate acid-hydrazine sol-gel route for preparation of Co3O4 nanoparticles has been developed. Co3O4 nanoparticles with different particle-sizes and morphology were prepared at different heat-treatment temperatures and the pure cubic nanocrystals of Co3O4 were obtained at 600℃. The synthesis process was monitored by infrared spectroscopy (IR), thermal gravimetric and differential thermal analysis (TG-DTA). The structure and morphology of Co3O4 nanocrystals were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and X-ray-photoelectron spectroscopy (XPS). The infrared absorption bands blue-shifted with particle size decreasing, which could be attributed to increasing surface effect. XPS results showed that predominant species at surface layers of Co3O4 nanocrystals are octahedral Co (Ⅲ).

 

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