Preparation, morphology, and microstructure of diameter-controllable vapor-grown carbon nanofibers
Preparation, morphology, and microstructure of diameter-controllable vapor-grown carbon nanofibers
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DOI：
10.1557/jmr.1998.0327
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发表时间：
1998-08
影响因子：
2.7
通讯作者：
Yue Fan;Feng Li;Hui‐Ming Cheng;G. Su;Yingfeng Yu;Zu-Hong Shen
中科院分区：
文献类型：
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作者：
Yue Fan;Feng Li;Hui‐Ming Cheng;G. Su;Yingfeng Yu;Zu-Hong Shen
采用改进的浮动催化法制备了直径在10-200 nm范围内可控的纯气相生长纳米碳纤维。通过透射电子显微镜（TEM）观察发现，VGCNF具有双重结构，即中空的高结晶度石墨丝（称为初级碳纤维）被低结晶度石墨热解碳层包围。使用高分辨率TEM观察到，VGCNF具有优异的石墨结晶度，石墨层整齐地平行于纤维轴堆叠。X射线衍射结果表明，随着碳纤维直径的减小，碳纤维的石墨化结晶度逐渐增大。
Pure vapor-grown carbon nanofibers (VGCNF’s) with controllable diameters of 10–200 nm were prepared by an improved floating catalyst method. Through transmission electron microscopy (TEM) observation, it was found that VGCNF’s have a duplex structure, a hollow and high-crystallinity graphite filament called primary carbon fiber surrounded by a pyrocarbon layer with low graphite crystallinity. It was observed using high-resolution TEM that VGCNF’s have excellent graphitic crystallinity with graphite layers stacked neatly parallel to fiber axis. Moreover, x-ray diffraction results showed that the graphitic crystallinity of carbon fibers became higher with decreasing diameter of carbon fibers.