Preparation and Characteristics of Carbon Nanotubes Filled with Cobalt

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• 作者：Suwen Liu ; Junjie Zhu ; Yizhak Mastai ; Israel Felner ; and Aharon Gedanken
• 刊名：Chemistry of Materials
• 出版年：2000
• 出版时间：August 2000
• 年：2000
• 卷：12
• 期：8
• 页码：2205 - 2211
• 全文大小：396K
• 年卷期：v.12,no.8(August 2000)
• ISSN：1520-5002

文摘

Carbon nonotubes filled with long continuous cobalt nanorods or nanoparticles weresynthesized by a simple catalytic process. Co(CO)₃NO was used as the precursor and servedas both the source for the carbon nanotubes and for the cobalt, the catalyst. Some nanotubesfilled with nanorods have big heads. The Co-filled nanotubes can be separated easily fromthe products by using a permanent magnet. The average diameter of the multiwallednanotubes is about 40 nm. The cobalt nanorods are a few micrometers long with a diameterof 20 nm. In addition, some long, ribbonlike structures of flattened nanotubes were alsoobserved in the product mixture. After sonication of the product mixture, a small number ofnanotube rings with cobalt nanoparticles were found. X-ray diffraction analysis shows thecobalt nanorods encapsulated in the carbon nanotubes as having an fcc and not the stablehexagonal structure. A growth mechanism for these filled nanotubes is proposed. XPS andRaman spectrum were also employed to analyze the products. The dc magnetic measurementswere conducted to test for its magnetic properties.