Morphology and Melting Behavior of Ionic Liquids inside Single-Walled Carbon Nanotubes

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• 作者：Shimou Chen ; Keita Kobayashi ; Yasumitsu Miyata ; Naoki Imazu ; Takeshi Saito ; Ryo Kitaura ; Hisanori Shinohara
• 刊名：Journal of the American Chemical Society
• 出版年：2009
• 出版时间：October 21, 2009
• 年：2009
• 卷：131
• 期：41
• 页码：14850-14856
• 全文大小：340K
• 年卷期：v.131,no.41(October 21, 2009)
• ISSN：1520-5126

文摘

We report the synthesis and characterization of single-walled carbon nanotubes (SWNTs) filled with a zinc-containing quaternary ammonium based ionic liquid (ChZnCl₃) inside. The threshold SWNT diameter for efficient encapsulation was determined to be ca. 0.97 nm. Different morphologies of the encapsulated ChZnCl₃ such as single-chain, double-helix, zigzag tubes, and random tubes were observed. The melting of ChZnCl₃ ionic liquid into “nanofluid” inside SWNTs was investigated by in situ TEM electron beam irradiation and compared with a high-temperature heat treatment. The thermal-decomposition temperature of the ChZnCl₃ ionic liquid confined in the SWNTs was much higher than in the bulk system. Furthermore, the doping effect of the encapsulated ChZnCl₃ on the host SWNTs can be varied (from p-type to n-type) by gradually reducing the filling ratio. The versatility of ionic liquids and the unique phase transition observed inside the SWNTs provide a new opportunity for modulating the electronic properties of carbon nanotubes.