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Layer-by-Layer Assembly of Nanotube-Polymer Thin Films with High Electrical Conductivity and Transparency

Published online by Cambridge University Press:  31 January 2011

Yong Tae Park
Affiliation:
ppaong@tamu.edu, Texas A&M University, Mechanical Engineering, College Station, Texas, United States
Aaron Y. Ham
Affiliation:
agentham_1@yahoo.com, Texas A&M University, Mechanical Engineering, College Station, Texas, United States
Jaime C. Grunlan
Affiliation:
jgrunlan@tamu.edu
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Abstract

Layer-by-layer (LbL) assembly was used to deposit transparent, highly conductive thin films using aqueous solutions of nanotubes stabilized by deoxycholate (DOC) and poly(diallyl-dimethylammonium chloride) (PDDA). Three different types of carbon nanotubes (CNTs) were used: (1) multi-walled carbon nanotubes (MWNTs), (2) a mixture of single, di- and tri-walled nanotubes (XM grade) and (3) purified HiPCO single-walled carbon nanotubes (SWNTs). SWNTs produced the most transparent (> 85 %T across visible spectrum) and electrically conductive (˜ 150 S/cm) 20-bilayer films with 42 nm thickness. Moreover, optoelectronic performance of SWNT-based thin films was improved with heat treatment due to the removal of PDDA. A 20-bilayer SWNT LbL film achieved a conductivity of 369 S/cm with a 5 min exposure to 400 °C. This study demonstrates the ability of the LbL technique to produce highly transparent and conductive nanotube-based thin films, which may be useful for a variety of large area electronics applications.

Type
Research Article
Copyright
Copyright © Materials Research Society 2010

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