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Simulation study of dielectrophoretic assembly of nanowire between electrode pairs

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Abstract

Dielectrophoresis (DEP) of rod-shaped nanostructures is attractive because of its exceptional capability to fabricate nanowire-based electronic devices. This efficient manipulation method, however, has a common side effect of assembling a certain number of nanowires at undesired positions. It is therefore essential to understand the underlying physics of DEP of nanowires in order to better guide the assembly. In this work, we propose theoretical methods to characterize the dielectrophoretic force and torque as well as the hydrodynamic drag force and torque on the nanowire (typical length: 10 μm). The trajectory of the nanowire is then simulated based on rigid body dynamics. The nanowire is predicted to either bridge the electrodes or attach on the surface of one electrode. A neighborhood in which the nanowire is more likely to bridge electrodes is found, which is conducive to successful assembly. The simulation study in this work provides us not only a better understanding of the underlying physics but also practical guidance on nanowire assembly by DEP.

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Acknowledgments

This work was supported by the National Science Foundation under Grant CNS 1035563.

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Correspondence to Quan Tao or Guangyong Li.

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Tao, Q., Lan, F., Jiang, M. et al. Simulation study of dielectrophoretic assembly of nanowire between electrode pairs. J Nanopart Res 17, 306 (2015). https://doi.org/10.1007/s11051-015-3102-6

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  • DOI: https://doi.org/10.1007/s11051-015-3102-6

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