Abstract
The assembly of single-walled carbon nanotubes (SWCNTs) using the AC dielectrophoresis technique is studied theoretically. It is found that the comb electrode bears better position control of SWCNTs compared to the parallel electrode. In the assembly, when some SWCNTs bridge the electrode first, they can greatly alter the local electrical field so as to “screen off” later coming SWCNTs, which contributes to the formation of dispersed SWCNT array. The screening distance scales with the gap width of electrodes and the length of SWCNTs, which provides a way to estimate the assembled density of SWCNTs. The influence of thermal noise on SWCNTs alignment is also analyzed in the simulation. It is shown that the status of the array distribution for SWCNTs is decided by the competition between the thermal noise and the AC electric-field strength. This influence of the thermal noise can be suppressed by using higher AC voltage to assemble the SWCNTs.
Highlights
Since its discovery in 1991, carbon nanotubes (CNTs) have attracted great research interests due to its unique onedimensional structure and outstanding properties [1]
DEP has the potential of separating metallic-single-walled carbon nanotubes (SWCNTs) and semiconductingSWCNTs [16], aligning carbon nanotubes between microelectrodes [17], and realizing large-scale manipulation [18]
F consists of two components: one is the deterministic DEP force due to electrical field generated by the electrodes; while the other is the random force induced by thermal noise in the surrounding medium
Summary
Since its discovery in 1991, carbon nanotubes (CNTs) have attracted great research interests due to its unique onedimensional structure and outstanding properties [1]. F consists of two components: one is the deterministic DEP force due to electrical field generated by the electrodes; while the other is the random force induced by thermal noise in the surrounding medium. The latter leads to the well-known Brownian motion of microparticles. Change the DEP movement of latter bundles We numerically demonstrate this effect by solving the Poisson’s equation with one SWCNT-bundle bridge the electrode (Fig. 2c, d) and use this field solution to simulate the subsequent SWCNT-bundles’ DEP process
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