氟对电弧制备碳纳米管结构和电输运的影响

Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials Pub Date : 2002-10-02 DOI:10.1063/1.1514119

A. V. Okotrub, A. Romanenko, N. F. Yudanov, L. G. Bulusheva, I. Asanov, O. Anikeeva, A. Chuvilin, A. Boronin, J. Bonard

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引用次数: 3

摘要

用Br2和BrF3的混合物在室温下对电弧中产生的多壁碳纳米管(MWNTs)和单壁碳纳米管(SWNTs)样品进行氟化处理。透射电镜显示，MWNTs只有几个外壳被氟化，而内壳保持完整。发现氟化导致SWNT绳断裂。X射线光电子和红外光谱表明，所制备的材料具有相似的C-F键特征。MWNT和SWNT样品的电导率随氟化分别降低了4个和3个数量级，但前者样品的电导率保持了温度依赖性。氟化SWNT中的电输运是具有局部无序的窄间隙半导体或半金属的特征。

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Fluorine Effect on the Structure and Electrical Transport of Arc‐Produced Carbon Nanotubes

The samples of multiwall carbon nanotubes (MWNTs) and single‐wall carbon nanotubes (SWNTs) produced in an electric arc were fluorinated using a mixture of Br2 and BrF3 at room temperature. Transmission electron microscopy showed that only several outer shells of MWNTs were fluorinated whereas the inner shells remained intact. The fluorination was found to cause the splitting of a SWNT rope. X‐ray photoelectron and infrared spectra indicated a similar character of C–F bonding in the materials produced. The electrical conductivity of the MWNT and SWNT samples is decreased with fluorination by four and three orders of magnitude respectively but retains the temperature dependence in the case of the former sample. The electrical transport in the fluorinated SWNT is characteristic of narrow‐gap semiconductors or semimetals with local disorder.

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Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials

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