Synthesis, characterization and microwave dielectric properties of flower - like Co(OH)2/C nanocomposites

AUTOR(ES)

Feng, Chao, Bi, Nannan, Liu, Xianguo, Jin, Chuangui, Huang, Kai, Xiao, Feng, Sun, Yuping, Or, Siu Wing

FONTE

Mat. Res.

DATA DE PUBLICAÇÃO

22/07/2014

RESUMO

Flower - like Co(OH)2/C nanocomposites have been synthesized by a facile hydrothermal method. Flower - like Co(OH)2/C nanocomposites were self - assembled by the nanosheets with the thickness distribution of 50 - 80 nm and abundant flocculent carbon structures. With the help of transmission electron microscopy and energy dispersive spectrometer, nanosheets were observed to have core/shell structure, in which Co(OH)2 worked as cores and amorphous C as shells. When the as - prepared products were heated for 6 h at 180 ºC, the Co(OH)2 cores were amorphous. The heating time increased to 10 h, the Co(OH)2 cores became crystalline. The formation mechanism and the self - assembly evolution process were proposed. The microwave dielectric properties of Co(OH)2/C nanocomposites were investigated in the frequency range of 0.03 - 18 GHz. Compared with the amorphous Co(OH)2/C nanocomposites, crystalline nanocomposites had the better conductivity.

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