Multidirectional Hierarchical Nanocomposites Made by Carbon Nanotube Growth within Layer-by-Layer-Assembled Films
Multidirectional Hierarchical Nanocomposites Made by Carbon Nanotube Growth within Layer-by-Layer-Assembled Films
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DOI：
10.1021/cm1030443
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发表时间：
2011-02-22
影响因子：
8.6
通讯作者：
Hart, A. John
中科院分区：
文献类型：
--
作者：
Li, Jinjing;Srivastava, Sudhanshu;Hart, A. John
我们展示了制造的多向和分层的碳纳米管（CNT）薄膜在不同的基板上，使用纳米复合催化剂薄膜制备的逐层（LBL）组件。CNT密度和产率由蒙脱石粘土/聚（二烯丙基二甲基氯化铵（MTM/PDDA））支撑膜的厚度控制。使用相同的方法，少壁碳纳米管生长在平面硅基板，碳纤维，钛丝网。在平坦的基底上，独特的双层CNT森林，让人联想到微型“手风琴”，由于Fe催化剂通过载体的扩散而形成，然后由于生长的CNT施加的机械力而分裂。碳纳米管涂层的钛丝的电化学测量表明，比电容的85倍的增强，和7.1 F/g的碳纳米管单独。这种用于CNT生长的衬底工程的新方法可以通过在多个长度尺度上对CNT进行分级排序来创建具有独特和非线性特性的材料，并且可以扩展到大面积箔和织物。
We demonstrate fabrication of multidirectional and hierarchical carbon nanotube (CNT) films on diverse substrates, using nanocomposite catalyst films prepared by layer-by-layer (LBL) assembly. CNT density and yield are controlled by the thickness of a montmorillonite clay/poly(dyallyldimethyl ammonium chloride (MTM/PDDA) support film. Using identical methods, few-walled CNTs are grown on flat silicon substrates, carbon fibers, and titanium wire mesh. On flat substrates, unique bilayer CNT forests, reminiscent of microscale "accordions", form because of diffusion of the Fe catalyst through the support which is then split because of mechanical forces exerted by the growing CNTs. Electrochemical measurements of CNT-coated Ti wires demonstrate an 85-fold enhancement in specific capacitance, and 7.1 F/g for the CNTs alone. This novel approach to substrate engineering for CNT growth can create materials with unique and nonlinear properties by hierarchical ordering of CNTs at multiple length scales, and is scalable to large-area foils and fabrics.