2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Three-dimensional Carbon Nanotube Hybrid Neural Interface for Efficient Charge Transport

T. Kmecko, M. Honnatti and G. Hughes
Zyvex Labs, LLC, US

carbon nanotube, neural interface, electrode, conductive polymer, PEDOT, polypyrrole

We report the method and results of carbon nanotube and conductive polymer hybrid interface for neural electrode surface modification to reduce electrode impedance through providing a mesoporous structure for efficient charge transport. Specifically, we have investigated the coupling of carbon nanotubes (CNTs) with polypyrrole (PPy) and poly(3,4-ethylendioxythiophene) (PEDOT). CNTs dispersed within a polymer matrix act as both electrical dopants to improve electrical properties and mechanical fillers to enhance mechanical stability. Scanning electron microscopy (SEM), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) were used to study the surface morphology, electrochemical properties and stability of electrodeposited polymers. We have been able to tune the impedance of coated gold electrodes to range between 0.1 megaOhms down to 100 Ohms measured at a frequency of 1 kHz. In comparison to pristine polymer, greater charge transfer capability has also been observed with the addition of carbon nanotubes to both PPy and PEDOT. Our results demonstrate that we can control the morphology and electrochemical properties of polypyrrole and poly(3,4-ethylendioxythiophene) containing carbon nanotubes.

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Nanotech 2007 Conference Program Abstract


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