Fukushima Takanori, Kosaka Atsuko, Yamamoto Yohei, Aimiya Takuji, Notazawa Shunsuke, Takigawa Toshikazu, Inabe Tamotsu, Aida Takuzo
Aida Nanospace Project, ERATO-SORST Japan Science and Technology Agency, National Museum of Emerging Science and Innovation, 2-41 Aomi, Koto-ku, Tokyo 135-0064, Japan.
Small. 2006 Apr;2(4):554-60. doi: 10.1002/smll.200500404.
Free-radical polymerization of an imidazolium ion-based ionic liquid bearing a methacrylate group, gelling with single-walled carbon nanotubes (SWNTs), allows fabrication of a mechanically reinforced, electroconductive soft material (bucky plastic). A film sample of this material displays an excellent conductivity of 1 S cm(-1) and a 120-fold enhancement of the Young's modulus at a 7 wt % content of SWNTs. The conductivity is temperature-dependent in the range 5-300 K, suggesting that the conductive process involves carrier hopping. Scanning electron and atomic force micrographs of a bucky plastic film display the presence of crosslinked networks consisting of finely dispersed SWNTs. Such nanotube networks, developed in the polymer matrix, likely suppress slipping of entrapped polymer molecules via a strong interfacial interaction and also facilitate intertubular carrier transport. Although a bucky plastic derived from a vinylimidazolium ion-based ionic liquid monomer shows a comparable conductivity to that of the methacrylate version, the film is brittle irrespective of the presence or absence of SWNTs.
带有甲基丙烯酸酯基团的咪唑鎓离子基离子液体的自由基聚合，与单壁碳纳米管（SWNTs）形成凝胶，可制备出机械增强的导电软材料（巴基塑料）。该材料的薄膜样品在SWNTs含量为7 wt%时显示出1 S cm⁻¹的优异电导率，杨氏模量提高了120倍。电导率在5 - 300 K范围内与温度有关，表明导电过程涉及载流子跳跃。巴基塑料薄膜的扫描电子显微镜和原子力显微镜图像显示存在由精细分散的SWNTs组成的交联网络。在聚合物基体中形成的这种纳米管网络，可能通过强界面相互作用抑制被困聚合物分子的滑动，并促进管间载流子传输。尽管由乙烯基咪唑鎓离子基离子液体单体制备的巴基塑料显示出与甲基丙烯酸酯版本相当的电导率，但无论是否存在SWNTs，该薄膜都是脆性的。
