Large-scale synthesis and characterization of helically coiled carbon nanotubes by use of Fe(CO)5 as floating catalyst precursor
Large-scale synthesis and characterization of helically coiled carbon nanotubes by use of Fe(CO)5 as floating catalyst precursor
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DOI：
10.1021/cm021290g
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发表时间：
2003-07
影响因子：
8.6
通讯作者：
Haoqing Hou;Z. Jun;A. Weller;A. Greiner
中科院分区：
文献类型：
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作者：
Haoqing Hou;Z. Jun;A. Weller;A. Greiner
以Fe(CO)5为悬浮催化剂前驱体，吡啶或甲苯为碳源，在1000℃以上的温度下，在氢气流下共热解，得到了螺旋形多壁碳纳米管（HCNTs），其主要产物为直径30 ~ 80 nm。相比之下，在700 - 800°C下热解只得到碳包覆的铁纳米颗粒。通过电子显微镜、拉曼光谱和广角x射线衍射对HCNTs进行了表征。在先前报道的模型的基础上讨论了HCNTs的生长机制。
Helically shaped multiwalled carbon nanotubes (HCNTs) (diameter 30−80 nm) were obtained as main products in large quantities by co-pyrolysis of Fe(CO)5 as floating catalyst precursor and pyridine or toluene as carbon source at temperatures above 1000 °C under flow of hydrogen. In contrast, pyrolysis at 700−800 °C yielded only carbon-coated Fe nanoparticles. The HCNTs were characterized by electron microscopy, Raman spectroscopy, and wide-angle X-ray diffraction. The growth mechanism of the HCNTs was discussed on the basis of previously reported models.