Department of Physics, National University of Singapore, 117542 Singapore.
ACS Nano. 2010 Feb 23;4(2):1067-75. doi: 10.1021/nn9012109.
In this work, detailed studies of three different capillary-assisted techniques for the formations of large-scale multiwalled carbon-nanotube (MWNT)-based microstructures were presented. Using laser induced artificial vacancies, new insights into the effect of laser power, densities of MWNTs, and oxidation process dependencies for the creations of MWNT polygons were presented. With organized initiations, MWNT pillars were crafted out of MWNT arrays and 0.21 pL of water was found to produce sufficient force to bring about 14.7 mum deflections of a 9.19 x 9.19 x 24.1 mum(3) pillar, thereby allowing well-controlled formations of three-dimensional top-gathering MWNTs. Lastly, by twisting densified MWNT microbelts, 14 times improvements in resistivity as compared to undensified MWNT microwalls were achieved. Through prepatterning, the amount of twisting effect could be controlled, and this in turn allowed control of the resistance of the densified MWNT microwalls. These new insights and techniques presented could further encourage the use of self-organized MWNT structures with initiation as a flexible and viable route for the implementations of carbon-nanotube-based electronic devices.
在这项工作中，详细研究了三种不同的毛细管辅助技术，用于形成大规模的多壁碳纳米管（MWNT）基微结构。利用激光诱导的人工空位，深入了解了激光功率、MWNTs 密度和氧化过程依赖性对 MWNT 多边形形成的影响。通过有组织的引发，MWNT 柱从 MWNT 阵列中制作出来，发现 0.21pL 的水足以产生足够的力，使 9.19x9.19x24.1µm³（3）的柱子产生 14.7µm 的挠度，从而可以很好地控制三维聚集 MWNT 的形成。最后，通过对致密化的 MWNT 微带进行扭转，与未致密化的 MWNT 微壁相比，电阻率提高了 14 倍。通过预图案化，可以控制扭转效果的程度，从而可以控制致密化的 MWNT 微壁的电阻。这些新的见解和技术可以进一步鼓励使用自组织的 MWNT 结构和引发作为实现基于碳纳米管的电子器件的灵活可行的途径。
