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

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

doi:10.1590/1516-1439.251813

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

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

Research output: Journal article publication › Journal article › Academic research › peer-review

2 Citations (Scopus)

Abstract

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)2worked as cores and amorphous C as shells. When the as-prepared products were heated for 6 h at 180 °C, the Co(OH)2cores 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.

Original language	English
Pages (from-to)	920-925
Number of pages	6
Journal	Materials Research
Volume	17
Issue number	4
DOIs	https://doi.org/10.1590/1516-1439.251813
Publication status	Published - 1 Jan 2014

Keywords

Carbon
Core/shell structure
Nanocomposites
Nanosheets

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

More information

10.1590/1516-1439.251813

Cite this

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

abstract = "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)2worked as cores and amorphous C as shells. When the as-prepared products were heated for 6 h at 180 °C, the Co(OH)2cores 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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author = "Chao Feng and Nannan Bi and Xianguo Liu and Chuangui Jin and Kai Huang and Feng Xiao and Yuping Sun and Or, {Siu Wing}",

year = "2014",

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doi = "10.1590/1516-1439.251813",

language = "English",

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AU - Feng, Chao

AU - Bi, Nannan

AU - Liu, Xianguo

AU - Jin, Chuangui

AU - Huang, Kai

AU - Xiao, Feng

AU - Sun, Yuping

AU - Or, Siu Wing

PY - 2014/1/1

Y1 - 2014/1/1

N2 - 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)2worked as cores and amorphous C as shells. When the as-prepared products were heated for 6 h at 180 °C, the Co(OH)2cores 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.

AB - 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)2worked as cores and amorphous C as shells. When the as-prepared products were heated for 6 h at 180 °C, the Co(OH)2cores 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.

KW - Carbon

KW - Core/shell structure

KW - Nanocomposites

KW - Nanosheets

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