Characterization of Single- and Multi-walled Carbon Nanotubes at Microwave Frequencies

The present paper reports the first step towards detecting and characterizing both the single-and multi walled carbon nanotubes using microwave frequencies. The dielectric properties for these nanostructured carbon materials are measured using the rectangular waveguide technique and are determined in the frequency regime ranging 8-40 GHz. The data is represented in terms of dielectric constants and both real and imaginary parts of permittivity and permeability. These results represents a milestone in such measurements for carbon nanotube structures serving as a model such that it covers a wide frequency range using an efficient, non-invasive and highly accurate technique that is ideal for high frequency characterization for a variety of nanoscale materials.