期刊
NEW CARBON MATERIALS
卷 25, 期 6, 页码 431-437出版社
ELSEVIER
DOI: 10.1016/S1872-5805(09)60043-3
关键词
Carbon microspheres; Oxidation; Hollow carbon microspheres; Formation mechanism
资金
- Changjiang Scholar and Innovative Research Team in University [IRT0972]
- National Natural Science Foundation of China [201971094]
- International S & T Co-operation Program [2007DFA50940]
- Natural Science Foundation of Shanxi Province [2009011012-4]
- International S & T Co-operation Program of Shanxi Province [2009081018, 2010081017]
- Shanxi Research Fund for Returned Scholars [2008-31]
Hollow carbon microspheres, several micrometers in diameter, were prepared from solid carbon microspheres by a simple oxidation-in-air process. The morphology and structure of these products were characterized by field-emission scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, Raman spectroscopy, and thermogravimetry. Results indicate that heat treatment temperature in air plays a key role in the evolution of the cavity size and wall thickness of the hollow carbon microspheres with poor graphitization, and high heating temperature leads to a thin wall thickness and large inner diameter. A proposed formation mechanism reveals that the hollow carbon microspheres are formed as a result of the effect of curvature and crystallinity, i. c. the inner part of solid carbon microspheres has a large curvature and a low crystallinity, which is much more easily oxidized to form hollow carbon microspheres when subjected to air oxidation.
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