导电岛微电极系统中纳米线介电组装行为研究

Study on the Dielectric Assembly Behaviors of Nanowires in the Conductive Island Microelectrode System

摘要:

为了获得导电岛微电极系统中纳米线的介电组装特性,基于平面微电极对和导电岛微电极系统,进行了两种系统中纳米线操控的对比实验。分别建立了平面微电极对和导电岛微电极系统的纳米线介电组装模型,探究了两种模型下的纳米线从初始位置到最终桥接上微间隙过程中的运动轨迹；分析了导电岛微电极系统中纳米线所受的介电泳力、交流电热流以及两者合作用的电动力学行为。导电岛微电极系统对纳米线有着较强的介电俘获作用,导电岛的加入能够让纳米线更好地俘获到微间隙；同时纳米线的介电组装会受到频率的影响,当频率达到翻转频率,在微间隙上方产生的微流体漩涡能够把远场区域纳米线输送到组装区,使得纳米线受到正介电泳力的作用而被组装至微间隙。

Abstract:

In order to obtain the dielectric assembly characteristics of nanowires in the conductive island microelectrode system, a comparative experiments of nanowire manipulation in both systems were conducted based on the planar microelectrode pairs and the conductive island microelectrode systems. The nanowire dielectric assembly models of the planar microelectrode pairs and the conductive island microelectrode systems were established respectively:The motion trajectory of the nanowires from the initial position to the final bridging onto the microgap under the two models was explored. And the nanowires subjected to dielectrophoretic forces, alternating current heat flow, and the electrokinetic behavior of cooperation between the two in a conductive island microelectrode system were analyzed. The conductive island microelectrode system has a strong dielectric capture effect on nanowires, and the addition of conductive islands can make better capture of nanowires to the microgap. Meanwhile, the dielectric assembly of nanowires is affected by frequency. When the frequency reaches the flip frequency, the microfluidic vortex generated above the microgap can transport nanowires in the far-field region to the assembly area, which makes the nanowires to be assembled to the microgap by the positive dielectrophoretic force.