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A study of the growth process of Co 3 O 4 microcrystals synthesized via a hydrothermal method
Author(s) -
Hongyan Xu,
Jiangtao Diwu,
Zhenyin Hai,
Libo Gao,
Qiang Zhang,
Jun Tang,
Binzhen Zhang,
Chenyang Xue
Publication year - 2016
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201500198
Subject(s) - hydrothermal circulation , scanning electron microscope , lamella (surface anatomy) , raman spectroscopy , thermal treatment , materials science , hydrothermal synthesis , crystallography , diffraction , chemical engineering , powder diffraction , urea , analytical chemistry (journal) , chemistry , optics , organic chemistry , physics , engineering , composite material
Pure Co 3 O 4 microcrystals were prepared by a hydrothermal method from Co(NO 3 ) 2 ·6H 2 O and urea solution, and the effect of thermal treatment time on the growth of Co 3 O 4 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 Co 3 O 4 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 Co 3 O 4 microcrystals of uniform size (∼6 μm) are synthesized via a 12‐h thermal treatment. Moreover, the synthesis mechanism has been studied.