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Conductive Nano-brush Synthesized by Physical Grafting of Conducting Polymers on Carbon Nanotube

  • Kaushalkumar Purohit (a1), Maureen Mirville (a1), Sze C. Yang (a1), Arun Shukla (a2) and Vijaya B. Chalivendra (a3)...

Abstract

We report a novel method for synthesizing electrically conductive nano-brush (CNB) by physical grafting of organic conducting polymers on carbon nano tubes (CNT). The objective for this synthesis is to produce nano tubes having a CNT stem coated with flexible electronic conducting polymers. The nano-brush is to be blended into common polymers (e.g. epoxy, polyurethane, and poly(vinyl alcohol)) to form electrically conductive composite material. The flexible organic conducting polymer in CNB is a potentially sensitive electronic probe for mechanically induced nano-deformation of the composite because it is molecularly entangled with the host polymers. The electrical networks of CNB embedded in polymeric composites are potentially useful as in situ sensors for monitoring material deformation with an unprecedented level of sensitivity. The composite material is “smart” in the sense that it self-reports the structural “health” before load induced material failure.

Our method for grafting conducting polymer does not require chemical reactions with the surface atoms of the carbon nano tube. We used physical adsorption to graft electronic conducting polymer to CNT. We first synthesized a water-soluble electronic conducting polymer which is a molecular complex between poly(acrylic acid) and polyaniline. The CNT solid were dispersed and un-bundled by sonnication in the conducting polymer solution. Due to the high affinity between CNT and the conducting polymer, the surface of CNT can be fully covered with the conducting polymer. The experimental data is consistent with a structure of nano brush with high density of conducting polymers grafted on the CNT surface.

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[2]Li, W., McCarthy, P. A., Liu, D., Huang, J., Yang, S., Wang, H.-L., “Toward understanding and optimizing the template-guided synthesis of chiral polyaniline nanocomposites,” Macromolecules, 35, 99759982 (2002).
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4.Karpovich, D.S., Blanchard, G. J., “Direct Measurement of the Adsorption Kinetics …Langmuir, 1994, 10, 33153322.
5.Assume that the carbon-carbon bond length of 1.45 angstrom, and the multi-wall CNT is composed of an average of 10 layers of concentric cylinders.
6.Random coil root mean square end-to-end distance for a polymer with 6250 monomer units with persistence length of 2.5 angstrom per monomer.

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