Electrical Transport Behavior in Phenolic Resin-based Composites Doped with Multi-walled Carbon Nanotubes
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1006-R07-10
Electrical Transport Behavior in Phenolic Resin-Based Composites Doped with Multi-Walled Carbon Nanotubes Renato Amaral Minamisawa, Bopha Chhay, and Daryush ILA Physics, Center for Irradiation of Materials, Alabama A&M University, PO box 1447, Normal, AL, 35762
ABSTRACT The reported electromagnetic properties of carbon nanotubes (CNT) make them a promising material for nanoelectronic applications [1,2]. Addition of CNT has recently been shown to enhance mechanical properties of phenolic-resin polymers [3]. We are attempting to control the electrical transport behavior of phenolic-based polymers doped with CNT as a function of the different nanopowder concentration added to the polymer. In that regard, we developed a technique to obtain a material with homogenous dispersion of nanopowders, an important factor that influences the transport behavior. The chemical structure characterization was also evaluated using optical techniques. INTRODUCTION Polymeric materials containing only σ-bonds between carbons atoms in the sp3 state are generally insulators with conductivities less than 10-15 Ω-1cm-1. When π-bonds associated with groups of carbon atoms in the sp2 state are present, electrons are delocalized and are available as charge carriers. Polymeric carbon, produced from heattreated phenolic resin, is one example of these materials. Heat treated phenolic resin is characterized by an enormous drop in resistivity when heat treated above 400 oC [4]. Phenolic resin has been widely used in the electronics industry for fabrication of resistors, transformers and several other components. Recently, another promissory materials exploited in the electronic industry are those that contain carbon nanotubes (CNT). CNT were produced first in 1991 by an arc-discharge method [5]. Many evaluations of the mechanical, chemical resistance, electrical and electromagnetic properties have been reported [6,7]. CNT have many applications, such as nanoelectronics, field emission display, hydrogen storage, nanodevices, etc. [1,2]. Because of the symmetry and unique electronic sp2 structure of graphene, the structure of a nanotube strongly affects its electrical properties. In theory, metallic nanotubes can have an electrical current density more than 1000 times greater than metals such as silver and copper [8]. The singular characteristics of each material suggest that studies of phenolic-based composites doped with CNT promise a wide range of applications in electronics. Excellent enhancement of the mechanical properties of these composites for low (200 oC) and high (1000 oC) heat treatment temperatures of the thermosetting resol-type phenolic resin have been reported [3, 9].
The aim of this work is to evaluate the electrical transport behavior in the phenolic resin nanocomposites doped with carbon nanotubes, and to study the chemical changes induced in the process. Also, the fabrication process to obtain well dispersed, void free composites is described. EXPERIMENTAL We chose multi-walled carbon nanotubes (CNTs) with 30 nm diam
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