Carbon spheres prepared via solvent-thermal reaction method and their microstructures after high temperature treatment |
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Authors: | Cai-liu Yin Guo-fu Wen Qi-zhong Huang Xiu-fei Wang Liang-ming He and Bao-rong Liu |
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Affiliation: | (1) Department of Chemistry, Tongji University, 1239 Siping Road, 200092 Shanghai, People’s Republic of China;(2) Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, 200433 Shanghai, People’s Republic of China;(3) Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, 200050 Shanghai, People’s Republic of China; |
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Abstract: | Carbon spheres with size of 50–300 nm were synthesized via a solvent-thermal reaction with calcium carbide and chloroform
as reactants in a sealed autoclave. The morphologies and microstructures of carbon spheres before and after high temperature
treatment (HTT) were characterized by X-ray diffractometry (XRD), scanning electronic microscopy (SEM), energy diffraction
spectroscopy (EDS), and transmission electron microscopy (TEM). The formation mechanism of carbon spheres was discussed. The
results indicate that the carbon spheres convert to hollow polyhedron through HTT. Carbon spheres are composed of entangled
and curve graphitic layers with short range order similar to cotton structure, and carbon polyhedron with dimension of 50–250
nm and shell thickness of 15–30 nm. The change of solid spheres to hollow polyhedron with branches gives a new evidence for
formation mechanism of hollow carbon spheres. |
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Keywords: | carbon spheres solvent-thermal method microstructure high temperature treatment |
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