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The dielectrophoretic attachment of nanotube fibres on tungsten needles

机译：纳米碳纤维在钨针上的介电泳附着

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摘要

The dielectrophoretic attachment of multi-wall carbon nanotubes ( MWNTs) on the apex of tungsten needles immersed in a suspension was investigated. Growth of branched nanotube fibrils out of the needle surface was observed when an ac bias with a frequency of 1 MHz was applied. The fibrils finally coagulate to a single nanotube fibre anchored at the tip's apex during a retraction of the tip from the suspension. Because of the very high dielectric constant of MWNTs, a moderate electric field intensity is sufficient for attaching nanotubes on the tip. The former was approximately two orders of magnitude lower than that reported in previous experiments. The diameter of the nanotube fibres can be controlled by the applied voltage.
机译：研究了多壁碳纳米管（MWNT）在浸入悬浮液中的钨针顶点上的介电泳附着。当施加频率为1 MHz的交流偏压时，观察到分支纳米管原纤维从针头表面生长出来。在将尖端从悬浮液中撤回期间，原纤维最终凝结成锚定在尖端顶点的单根纳米管纤维。由于MWNT的介电常数非常高，适度的电场强度足以将纳米管附着在尖端上。前者比以前的实验报道的要低大约两个数量级。纳米管纤维的直径可以通过施加的电压来控制。

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