1. A study of the growth process of Co3O4microcrystals synthesized via a hydrothermal method
- Author
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Diwu Jiangtao, Xu Hongyan, Zhang Binzhen, Tang Jun, Xue Chenyang, Hai Zhenyin, Zhang Qiang, and Gao Libo
- Subjects
Diffraction ,Materials science ,Absorption spectroscopy ,Scanning electron microscope ,02 engineering and technology ,General Chemistry ,Thermal treatment ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Hydrothermal circulation ,0104 chemical sciences ,chemistry.chemical_compound ,Crystallography ,symbols.namesake ,Lamella (surface anatomy) ,chemistry ,Chemical engineering ,Urea ,symbols ,General Materials Science ,0210 nano-technology ,Raman spectroscopy - Abstract
Pure Co3O4 microcrystals were prepared by a hydrothermal method from Co(NO3)2·6H2O and urea solution, and the effect of thermal treatment time on the growth of Co3O4 microcrystals was studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman and UV-Vis absorption spectra. The results show that with the thermal treatment time increases from 2 h to 12 h, the shape of as-prepared Co3O4 microcrystals changes from the hedgehog sphere-like to the as-cubic one that were stacked by lots of lamella, and finally cubes, and then longer time treatment will only lead to the size growth and agglomeration of particles. In conclusion, the cubic Co3O4 microcrystals of uniform size (∼6 μm) are synthesized via a 12-h thermal treatment. Moreover, the synthesis mechanism has been studied.
- Published
- 2016