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Open AccessArticle

Manipulation and Investigation of Uniformly-Spaced Nanowire Array on a Substrate via Dielectrophoresis and Electrostatic Interaction

1
Department of Polymer Engineering, Pukyong National University, Busan 48547, Korea
2
Display Group, R&D Center, IM Co., Ltd., Hwaseong, Gyunggi-Do 18449, Korea
3
Department of Photonics and Nanoelectronics, Hanyang University, Ansan, Gyunggi-Do 15588, Korea
*
Author to whom correspondence should be addressed.
Nanomaterials 2018, 8(7), 456; https://doi.org/10.3390/nano8070456
Received: 29 May 2018 / Revised: 16 June 2018 / Accepted: 18 June 2018 / Published: 21 June 2018
Directed-assembly of nanowires on the dielectrics-covered parallel electrode structure is capable of producing uniformly-spaced nanowire array at the electrode gap due to dielectrophoretic nanowire attraction and electrostatic nanowire repulsion. Beyond uniformly-spaced nanowire array formation, the control of spacing in the array is beneficial in that it should be the experimental basis of the precise positioning of functional nanowires on a circuit. Here, we investigate the material parameters and bias conditions to modulate the nanowire spacing in the ordered array, where the nanowire array formation is readily attained due to the electrostatic nanowire interaction. A theoretical model for the force calculation and the simulation of the induced charge in the assembled nanowire verifies that the longer nanowires on thicker dielectric layer tend to be assembled with a larger pitch due to the stronger nanowire-nanowire electrostatic repulsion, which is consistent with the experimental results. It was claimed that the stronger dielectrophoretic force is likely to attract more nanowires that are suspended in solution at the electrode gap, causing them to be less-spaced. Thus, we propose a generic mechanism, competition of dielectrophoretic and electrostatic force, to determine the nanowire pitch in an ordered array. Furthermore, this spacing-controlled nanowire array offers a way to fabricate the high-density nanodevice array without nanowire registration. View Full-Text
Keywords: nanowire spacing; dielectrophoretic force; nanowire-nanowire electrostatic interaction nanowire spacing; dielectrophoretic force; nanowire-nanowire electrostatic interaction
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Choi, U.H.; Park, J.H.; Kim, J. Manipulation and Investigation of Uniformly-Spaced Nanowire Array on a Substrate via Dielectrophoresis and Electrostatic Interaction. Nanomaterials 2018, 8, 456.

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