YANG Yong-zhen, LIU Xu-guang, LUO Qiu-ping, JIN Lin, XU Bing-she. Structure evolution of carbon microspheres from solid to hollow. New Carbon Mater., 2010, 25(06): 431-437.
Citation:
YANG Yong-zhen, LIU Xu-guang, LUO Qiu-ping, JIN Lin, XU Bing-she. Structure evolution of carbon microspheres from solid to hollow. New Carbon Mater., 2010, 25(06): 431-437.
YANG Yong-zhen, LIU Xu-guang, LUO Qiu-ping, JIN Lin, XU Bing-she. Structure evolution of carbon microspheres from solid to hollow. New Carbon Mater., 2010, 25(06): 431-437.
Citation:
YANG Yong-zhen, LIU Xu-guang, LUO Qiu-ping, JIN Lin, XU Bing-she. Structure evolution of carbon microspheres from solid to hollow. New Carbon Mater., 2010, 25(06): 431-437.
1. Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology),
2.
Ministry of Education, Taiyuan 030024, China|
Funds:
Changjiang Scholar and Innovative Research Team in University (IRT0972), National Natural Science Foundation of China (20971094), 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), and 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.e. 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.