Preparation and Microwave Absorbing Characteristics of Multi-Walled Carbon Nanotube/Chiral-Polyaniline Composites

Abstract

The multi-walled carbon nanotubes (MWCNTs)/chiral-polyaniline composite was synthesized by in-situ chemical polymerization. Morphology, structure as well as thermal stability of the hybrid composites were characterized by using various techniques. Moreover, the complex permeability, permittivity, and microwave absorbing characteristics of the MWCNTs/chiral-polyaniline composites have been studied. Compared with those of the polyaniline (PANI) and MWCNTs, the real part ( ) and imaginary part ( ) of the complex permittivity as well as dielectric dissipation factor of the MWCNTs/chiral-PANI composites were much greater, while the real part ( ) and imaginary part ( ) of the complex permeability and the magnetic dissipation factor were smaller. The results indicate that the microwave absorption of MWCNTs/chiral-PANI composites was mainly attributed to the dielectric loss rather than magnetic loss.