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

Aligned Multi-walled Carbon Nanotubes_Epoxy Nanomposites with Enhanced Electrochemical Performance

Y.S. Chen, J.H. Huang and C.C. Chuang
National Tsing Hua University, TW

Keywords:
MWCNTs, epoxy, nanocomposite

Abstract:
We report a simple approach to enhance the electrochemical and mechanical properties of multi-walled carbon nanotubes (MWCNTs) electrodes. First, well-aligned MWCNTs were directly grown on the SiO2/Si substrate by microwave-heating chemical vapor deposition. Then, an epoxy-based polymer with a DDM curing agent was spin-coated onto the substrate to cover the side walls of MWCNTs. The amount of MWCNTs tips protruding from the epoxy resin matrix was controlled by the spinning speed. Cyclic voltammetry (CV) was used to characterize the electrochemical properties of MWCNTs electrodes in 0.5M KNO3 containing 5.0 mM ferricyanide, to obtain information on the capacitive background and electron transfer rate from the reaction redox species. It was found that the MWCNTs-epoxy nanocomposite electrode prepared by spin-coating epoxy at 7000 rev/min exhibited the smallest peak separation (< 93 mV) of redox species and lowest background current over a wide range of scan rates (20-500 mV/s). The excellent electroanalytic activities can be ascribed to the unique edge planes from the protruding parts of MWCNTs tips. Based on the CV results, the MWCNTs-epoxy nanocomposite electrode is a promising candidate for future highly sensitive biosensor applications.

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