Chemical vapor deposition based synthesis of carbon nanotubes and nanofibers using a template method
Chemical vapor deposition based synthesis of carbon nanotubes and nanofibers using a template method
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DOI：
10.1021/cm970412f
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发表时间：
1998-01-01
影响因子：
8.6
通讯作者：
Ruoff, RS
中科院分区：
文献类型：
--
作者：
Che, G;Lakshmi, BB;Ruoff, RS
我们开发了一种新的方法来制备石墨碳纳米纤维和纳米管系综。这种方法需要在有或没有镍催化剂的情况下，在氧化铝模板膜的孔内基于化学气相沉积(CVD)合成碳。在CVD过程中使用乙烯或芘，Ni催化的CVD的反应器温度为545℃，非催化的CVD过程的反应器温度为900℃。制得的碳纳米结构为端部开口的均匀中空管。随着沉积时间的增加，碳纳米管转化为碳纳米纤维。透射电子显微镜和电子衍射数据表明，镍催化剂沉积的石墨化碳纳米纤维的有序度不高。然而，将含碳薄膜在500摄氏度加热36小时，碳纳米纤维就会转化为高度有序的石墨。电子衍射数据显示了单晶石墨的斑点衍射图特征，其石墨化面平行于纳米纤维的长轴。
We have developed a new approach for preparing graphitic carbon nanofiber and nanotube ensembles. This approach entails chemical vapor deposition (CVD) based synthesis of carbon within the pores of an alumina template membrane with or without a Ni catalyst. Ethylene or pyrene was used in the CVD process with reactor temperatures of 545 degrees C for Ni-catalyzed CVD and 900 degrees C for the uncatalyzed process. The resultant carbon nanostructures were uniform hollow tubes with open ends. Increasing the deposition time converted the carbon nanotubes into carbon nanofibers. Transmission electron microscopy and electron diffraction data show the as deposited graphitic carbon nanofibers synthesized with the Ni catalyst were not highly ordered. Heating the carbon-containing membrane at 500 degrees C for 36 h, however, converts the carbon nanofibers into highly ordered graphite. The electron diffraction data show a spotted diffraction pattern characteristic of single-crystal graphite with the graphitic planes parallel to the long axis of the nanofibers.