Abstract
Abstract : During the period from 12/1/2011 to 11/30/2012, this research project mainly focused on the following three major tasks. These include (1) establishing a broadband electromagnetic (EM) wave absorption properties measurement system for a frequency region from 100 MHz to 20 GHz; (2) fabrications of multiwalled carbon nanotubes (MWCNTs)-epoxy composites samples for EM wave properties measurements; and (3) studies of broadband EM wave absorption properties of the CNT-polymer composite samples, by utilizing the newly established measurement system. We fabricated multi-walled carbon nanotubes (MWCNTs)-epoxy composite samples, using MWCNTs with an average outer diameter (OD) less than 8 nm. The weight fraction of MWCNTs in the CNT-epoxy composite samples was controlled as 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10wt %. We utilized an Agilent Vector Network Analyzer N5230C, coaxial transmission method, and Agilent 85071 material measurement software to study the EM wave absorption properties of the CNT-epoxy composite samples for a frequency range from 2 to 20 GHz. We successfully measured the complex permittivity and permeability , which are the fundamental physical quantities. We have also developed a new method to calculate the absorption ratio of the MWCNTs-epoxy composite samples in the first time in the research. We further analyzed the absorption properties of MWCNTs-epoxy composite samples.
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