Morphology and Melting Behavior of Ionic Liquids inside Single-Walled Carbon Nanotubes
Morphology and Melting Behavior of Ionic Liquids inside Single-Walled Carbon Nanotubes
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DOI：
10.1021/ja904283d
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发表时间：
2009-10-21
影响因子：
15
通讯作者：
Shinohara, Hisanori
中科院分区：
文献类型：
--
作者：
Chen, Shimou;Kobayashi, Keita;Shinohara, Hisanori
本文报道了一种填充含锌季铵盐离子液体（ChZnCl（3））的单壁碳纳米管的合成与表征。有效包封的阈值SWNT直径被确定为约100 μ m。0.97 nm.结果表明，ChZnCl（3）的包覆结构为单链、双螺旋、锯齿形管和无规管。利用TEM电子束原位辐照技术研究了ChZnCl（3）离子液体在单壁碳纳米管中熔融成“纳米流体”的过程，并与高温热处理进行了比较。通过逐渐降低填充率，可以改变包封的ChZnCl（3）对主体SWNT的掺杂效果（从p型到n型）。离子液体的多功能性和在单壁碳纳米管内部观察到的独特相变为调节碳纳米管的电子性质提供了新的机会。
We report the synthesis and characterization of single-walled carbon nanotubes (SWNTs) filled with a zinc-containing quaternary ammonium based ionic liquid (ChZnCl(3)) inside. The threshold SWNT diameter for efficient encapsulation was determined to be ca. 0.97 nm. Different morphologies of the encapsulated ChZnCl(3) such as single-chain, double-helix, zigzag tubes, and random tubes were observed. The melting of ChZnCl(3) 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 ChZnCl(3) ionic liquid confined in the SWNTs was much higher than in the bulk system Furthermore, the doping effect of the encapsulated ChZnCl(3) 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.