Directional pyrolytic growth of microscale carbon fibers on electrochemically pretreated polyacrylonitrile-based carbon microfibers

被引:2
|
作者
Chen, Xingxing [1 ]
Li, Nan [1 ]
Xia, Wei [1 ]
Muhler, Martin [1 ]
Schuhmann, Wolfgang [1 ]
Bron, Michael [1 ]
机构
[1] Ruhr Univ Bochum, D-44780 Bochum, Germany
关键词
carbon microfibers (CMFs); polyacrylonitrile-based carbon fibers (PAN-CFs); electropretreatment; vapor-grown carbon fibers (VGCF);
D O I
10.1007/s00604-007-0933-6
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Vapor-grown carbon microfibers were synthesized pyrolytically on electrochemically pretreated polyacrylonitrile-based carbon microfibers (PAN-CFs) without introducing any catalyst. Cyclohexane was used as the carbon source for the growth of fibers in a thermal chemical vapor deposition process (CVD). Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) were used for the characterization of the fibers. Microscale carbon fibers with about 1 to 2 mu m in diameter were formed at 1123 K, while carbon microfibers of about 0.3 mu m in diameter were synthesized at 1048 K. A pretreatment at negative potential or sequentially at both positive and negative potentials was found to be a prerequisite for the growth of carbon microfibers in the CVD process. Without electrochemical pretreatment or when only a positive potential was applied, the growth of microscale carbon fibers did not occur.
引用
收藏
页码:95 / 100
页数:6
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