Metal-assisted organization of shortened carbon nanotubes in monolayer and multilayer forest assemblies
Metal-assisted organization of shortened carbon nanotubes in monolayer and multilayer forest assemblies
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DOI：
10.1021/ja0160243
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发表时间：
2001-09-26
影响因子：
15
通讯作者：
Papadimitrakopoulos, F
中科院分区：
文献类型：
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作者：
Chattopadhyay, D;Galeska, I;Papadimitrakopoulos, F
垂直于基底排列的单壁碳纳米管 (SWNT) 密集阵列预计可增强各种重要技术器件的性能，例如传感器、1 场发射器、2 和有机发光二极管。 3 碳氢化合物前体在金属功能化基底上的高温催化分解已经产生了这种几何形状，但迄今为止仅实现了多壁纳米管 (NT)。 4、2d 通过 0.2 μm 孔径的陶瓷过滤器绘制 NT 悬浮液，同时将另一端固定在聚四氟乙烯基板上，也产生了垂直排列的几何形状。 5 在氧化环境中缩短单壁碳纳米管，6 然后对羧基端基进行化学修饰，6a 提出了另一种将 NT 垂直于基材排列的方法。短和长（缩短的单壁碳纳米管 (s-SWNT) 为数十纳米，原始单壁碳纳米管为几微米，直径为 1.3-1.4 纳米）单壁碳纳米管对胺官能化基材表现出相当大的亲和力，尽管它们倾向于平行于基材。 6b、c s-SWNT 的硫醇官能化导致在金基底上更好的排列；然而，该系统受到表面覆盖率低和吸附时间长的困扰。 6a 在本通讯中，我们报告了使用非水介质的金属辅助自组装形成了密集的 s-SWNT 森林阵列。这种方法还允许以逐层 (LBL) 组装格式生长连续的 s-SWNT 堆叠，一个在另一个之上。
Dense arrays of single-wall carbon nanotubes (SWNTs) aligned normal to substrates has been envisioned to enhance performance of various technologically important devices such as sensors, 1 field emitters, 2 and organic light-emitting diodes. 3 High-temperature catalytic decomposition of hydrocarbon precursors on metalfunctionalized substrates have yielded such geometries, however, only multiwall nanotubes (NTs) have been realized thus far. 4, 2d Drawing NT suspensions through a 0.2-μm-pore ceramic filter, while immobilizing the other end on a Teflon substrate, also produced vertically aligned geometries. 5 Shortening SWNTs in an oxidizing environment, 6 followed by chemical modifications of the carboxyl end groups, 6a presents an alternative method to align the NTs perpendicular to the substrate. Short and long (tens of nm for the shortened SWNTs (s-SWNTs) to a few microns for pristine SWNTs and 1.3-1.4 nm in diameter) SWNTs have exhibited considerable affinity for amine-functionalized substrates, although they tend to orient parallel to the substrate. 6b, c Thiol functionalization of s-SWNTs resulted in better alignment on gold substrates; nonetheless, this system was plagued by low surface coverage and long adsorption times. 6a In the present communication we report the formation of dense arrays of s-SWNTs-forest using a metal-assisted self-assembly from nonaqueous media. This approach also permits growth of successive stacks of s-SWNTs, one on top of each other, in a layer-by-layer (LBL) assembly format.