Sheng Wang, L. Qian, H. Xu
May 12, 2009
Citations
2
Influential Citations
57
Citations
Journal
Journal of Alloys and Compounds
Abstract
Abstract Nanorods and nanosheets of new cobalt hydroxide carbonates have been fabricated through hydrothermal method using CoCl 2 ·6H 2 O and CO(NH 2 ) 2 in the presence of polyvinylpyrrolidone (PVP). The products were characterized using Fourier transform infrared spectroscopy, elemental analysis, thermogravimetric analysis, X-ray diffraction, scanning electron microscopy and transmission electron microscope/selected area electron diffraction. The nanorods and nanosheets crystallize in different crystal structures with the chemical formula of Co(OH) 0.44 (CO 3 ) 0.78 ·0.29H 2 O and Co 2 (OH) 2 CO 3 , respectively. For the hexagonal phase with the morphology of nanorods, its lattice parameters are: a = 10.335(5) A, c = 3.124(1) A, the possible space group is P 622(177), and the number of chemical formula per unit cell is Z = 3. For the monoclinic phase with the morphology of nanosheets, its lattice parameters are: a = 9.362(1) A, b = 12.175(5) A, c = 3.281(4) A, β = 91.879(2), the possible space group is P 21/ a (14), and the number of chemical formula per unit cell is Z = 4. Our results indicate that the morphology and crystal structure of cobalt hydroxide carbonates are controlled by the reaction temperature, reaction time and PVP.