Liu Mingkai, Du Yifeng, Miao Yue-E, Ding Qianwei, He Sixin, Tjiu Weng Weei, Pan Jisheng, Liu Tianxi
State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, P. R. China.
Nanoscale. 2015 Jan 21;7(3):1037-46. doi: 10.1039/c4nr06117a.
Anisotropic electrically conductive films (PI-GNR/CNT) consisting of highly aligned polyimide (PI) composite fibers with graphene nanoribbon (GNR) and carbon nanotube (CNT) (GNR/CNT) hybrids as nanofillers have been prepared by electrospinning. The GNR/CNT hybrids used here were prepared by one-step partial unzipping of multi-walled CNTs, in which, with the residual CNTs bonded on the randomly arranged GNR sheets, not only the aggregation of GNR sheets was greatly prevented but also an electrically conductive pathway with good conductivity was effectively formed with the CNTs acting as linking bridges between different GNRs. Due to the three-dimensional (3D) conductive network structure of the GNR/CNT hybrid and fine dispersion and alignment inside the PI fibers, as well as the good interfacial interaction between the GNR/CNT hybrid and the PI matrix, PI-GNR/CNT composite films exhibit a unique property of anisotropic electrical conductivity of 8.3 × 10(-2) S cm(-1) in the parallel direction along the fibers and 7.2 × 10(-8) S cm(-1) in the perpendicular direction, which may open the way for wide potential applications of anisotropic conductive nanomaterials in practical production and scientific research fields.
通过静电纺丝制备了由高度取向的聚酰亚胺（PI）复合纤维与作为纳米填料的石墨烯纳米带（GNR）和碳纳米管（CNT）（GNR/CNT）杂化物组成的各向异性导电薄膜（PI-GNR/CNT）。这里使用的GNR/CNT杂化物是通过多壁碳纳米管的一步部分解链制备的，其中，由于残余的碳纳米管粘结在随机排列的GNR片上，不仅极大地防止了GNR片的聚集，而且碳纳米管作为不同GNR之间的连接桥有效地形成了具有良好导电性的导电路径。由于GNR/CNT杂化物的三维（3D）导电网络结构以及在PI纤维内部的良好分散和取向，以及GNR/CNT杂化物与PI基体之间良好的界面相互作用，PI-GNR/CNT复合薄膜表现出独特的各向异性导电性能，沿纤维平行方向的电导率为8.3×10（-2）S cm（-1），垂直方向为7.2×10（-8）S cm（-1），这可能为各向异性导电纳米材料在实际生产和科研领域的广泛潜在应用开辟道路。
