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arXiv 0704.0113cond-mat.mtrl-sci
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从块体材料中组装致密排列的单壁碳纳米管

Langmuir blodgett assembly of densely aligned single walled carbon nanotubes from bulk materials

Xiaolin Li, Li Zhang, Xinran Wang, Iwao Shimoyama, Xiaoming Sun, Won-Seok Seo, Hongjie Dai

摘要:

单壁碳纳米管具有先进的电学和表面特性,可用于高性能纳米电子学。对未来制造纳米管电路重要的是将SWNT大规模组装成对准形式。尽管在组装和定向合成方面取得了进展,但对齐和紧密堆积形式的原始SWNT仍然难以实现,并且需要通过并行SWNT的集体操作来实现高电流、速度和密度器件。在这里,我们开发了一种Langmuir Blodgett方法,实现单层排列的单壁碳纳米管与致密的包装,其核心是一个非共价聚合物功能化PmPV赋予高溶解度和稳定性的单壁碳纳米管在有机溶剂DCE。在LB膜压缩过程中的压力循环或退火降低了滞后,并促进了通过显微镜和偏振拉曼光谱表征的单壁碳纳米管的高度对准和包装。单层单壁碳纳米管很容易图案化的装置集成的微制造,使最高电流3mA通过的最窄的区域与对齐的单壁碳纳米管包装至今。

英文摘要:

Single walled carbon nanotubes exhibit advanced electrical and surface properties useful for high performance nanoelectronics. Important to future manufacturing of nanotube circuits is large scale assembly of SWNTs into aligned forms. Despite progress in assembly and oriented synthesis, pristine SWNTs in aligned and close-packed form remain elusive and needed for high current, speed and density devices through collective operations of parallel SWNTs. Here, we develop a Langmuir Blodgett method achieving monolayers of aligned SWNTs with dense packing, central to which is a non covalent polymer functionalization by PmPV imparting high solubility and stability of SWNTs in an organic solvent DCE. Pressure cycling or annealing during LB film compression reduces hysteresis and facilitates high degree alignment and packing of SWNTs characterized by microscopy and polarized Raman spectroscopy. The monolayer SWNTs are readily patterned for device integration by microfabrication, enabling the highest currents 3mA through the narrowest regions packed with aligned SWNTs thus far.

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