Controlled Positioning of Carbon Nanotubes by Dielectrophoresis: Insights into the Solvent and Substrate Role
Controlled Positioning of Carbon Nanotubes by Dielectrophoresis: Insights into the Solvent and Substrate Role
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DOI：
10.1021/nn901559q
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发表时间：
2010-01-01
期刊：
影响因子：
17.1
通讯作者：
Magrez, Arnaud
中科院分区：
文献类型：
--
作者：
Duchamp, Martial;Lee, Kyumin;Magrez, Arnaud
我们证明了精确控制沉积的能力，从溶液中的一个定义的数量的碳纳米管（CNT）到微加工电极使用介电泳。溶剂化架周围的碳纳米管，表现出高的介电常数，这可能是大于本征介电常数的碳纳米管，被发现在电泳过程中发挥了至关重要的作用。衬底电阻率也是。非常重要：在基板和微电极之间的电场的空间重新分配导致偏离CNT的精确位置。给出了碳纳米管介电电泳的一种方法，该方法可以推广到其他纳米线或纳米管。
We demonstrate the ability to precisely control the deposition of a defined number of carbon nanotubes (CNTs) from solution onto microfabricated electrodes using dielectrophoresis. The solvation shelf around the CNTs, exhibiting a high dielectric constant which is possibly larger than the intrinsic dielectric constant of CNTs, is found to play a crucial role in electrophoretic processes. Substrate resistivity is also. very important: The spatial repartition of the electric field between the substrate and the microelectrodes leads to deviations from the precise location of the CNTs. A recipe is given for the dielectrophoresis of CNTs which can be extended to other nanowires or nanotubes.