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Nanomaterials 2013, 3(2), 272-288; doi:10.3390/nano3020272
Article

Electrophoretic Deposition of Carbon Nanotubes on 3-Amino-Propyl-Triethoxysilane (APTES) Surface Functionalized Silicon Substrates

 and *
Division of Electrical and Computer Engineering, School of Electrical Engineering and Computer Science, Louisiana State University, 3101 P. F. Taylor Hall, Baton Rouge, LA 70803, USA
* Author to whom correspondence should be addressed.
Received: 12 March 2013 / Revised: 2 May 2013 / Accepted: 5 May 2013 / Published: 13 May 2013
(This article belongs to the Special Issue CNT based Nanomaterials)
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Abstract

Fabrication of uniform thin coatings of multi-walled carbon nanotubes (MWCNTs) by electrophoretic deposition (EPD) on semiconductor (silicon) substrates with 3-aminopropyl-triethoxysilane (APTES) surface functionalization has been studied extensively in this report. The gradual deposition and eventual film formation of the carbon nanotubes (CNTs) is greatly assisted by the Coulombic force of attraction existing between the positively charged –NH2 surface groups of APTES and the acid treated, negatively charged nanotubes migrating towards the deposition surfaces. The remarkable deposition characteristics of the CNT coatings by EPD in comparison to the dip coating method and the influence of isopropyl (IPA)-based CNT suspension in the fabricated film quality has also been revealed in this study. The effect of varying APTES concentration (5%–100%) on the Raman spectroscopy and thickness of the deposited CNT film has been discussed in details, as well. The deposition approach has eliminated the need of metal deposition in the electrophoretic deposition approach and, therefore, establishes a cost-effective, fast and entirely room temperature-based fabrication strategy of CNT thin films for a wide range of next generation electronic applications.
Keywords: carbon nanotubes; electrophoretic deposition (EPD); APTES (3-aminopropyl-triethoxysilane); surface functionalization; acid reflux carbon nanotubes; electrophoretic deposition (EPD); APTES (3-aminopropyl-triethoxysilane); surface functionalization; acid reflux
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Sarkar, A.; Daniels-Race, T. Electrophoretic Deposition of Carbon Nanotubes on 3-Amino-Propyl-Triethoxysilane (APTES) Surface Functionalized Silicon Substrates. Nanomaterials 2013, 3, 272-288.

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