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Article

Step-Wise Deposition Process for Dielectrophoretic Formation of Conductive 50-Micron-Long Carbon Nanotube Bridges

1
Department of Mechanical and Aerospace Engineering, University of California, Irvine, 5200 Engineering Hall, Irvine, CA 92627-2700, USA
2
Department of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, HIT Campus G908, Shenzhen, Guangdong 518055, China
*
Author to whom correspondence should be addressed.
Micromachines 2020, 11(4), 371; https://doi.org/10.3390/mi11040371
Received: 1 March 2020 / Revised: 26 March 2020 / Accepted: 27 March 2020 / Published: 1 April 2020
(This article belongs to the Special Issue 10th Anniversary of Micromachines)
Carbon Nanotube (CNT) agglomerates can be aligned along field lines between adjacent electrodes to form conductive bridges. This study discusses the step-wise process of dielectrophoretic deposition of CNTs to form conducting bridges between adjacent electrodes. For the first time, the creation of conductive CNT bridges spanning lengths over 50 microns is demonstrated. The CNT bridges are permanently secured using electrodeposition of the conducting polymer polypyrrole. Morphologies of the CNT bridges formed within a frequency range of 1 kHz and 10 MHz are explored and explained as a consequence of interplay between dielectrophoretic and electroosmotic forces. Postdeposition heat treatment increases the conductivity of CNT bridges, likely due to solvent evaporation and resulting surface tension inducing better contact between CNTs. View Full-Text
Keywords: carbon nanotube (CNT); dielectrophoresis; electroosmosis; micromanufacturing carbon nanotube (CNT); dielectrophoresis; electroosmosis; micromanufacturing
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MDPI and ACS Style

Zhou, T.; Kropp, E.; Chen, J.; Kulinsky, L. Step-Wise Deposition Process for Dielectrophoretic Formation of Conductive 50-Micron-Long Carbon Nanotube Bridges. Micromachines 2020, 11, 371. https://doi.org/10.3390/mi11040371

AMA Style

Zhou T, Kropp E, Chen J, Kulinsky L. Step-Wise Deposition Process for Dielectrophoretic Formation of Conductive 50-Micron-Long Carbon Nanotube Bridges. Micromachines. 2020; 11(4):371. https://doi.org/10.3390/mi11040371

Chicago/Turabian Style

Zhou, Tuo, Ethan Kropp, Jingyuan Chen, and Lawrence Kulinsky. 2020. "Step-Wise Deposition Process for Dielectrophoretic Formation of Conductive 50-Micron-Long Carbon Nanotube Bridges" Micromachines 11, no. 4: 371. https://doi.org/10.3390/mi11040371

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