Complex permittivity and electromagnetic interference shielding properties of Ti 3 SiC 2 /polyaniline composites

Ti 3 SiC 2 /insulating polyaniline (Ti 3 SiC 2 /PANI) composites were prepared by solution blending and subsequently by hot-pressing process. The dielectric permittivity and electromagnetic interference (EMI) shielding effectiveness (SE) of the composites were determined in the frequency range of 8.2–12.4 GHz (X-band). Both real and imaginary permittivities increase with the increasing Ti 3 SiC 2 content, and which are attributed to the enhanced displacement current and conduction current. The EMI SE of the composites can be greatly improved by addition of Ti 3 SiC 2 filler, which may be ascribed to the increase of electrical conductivity of the composites. It is also found that the reflection of electromagnetic radiation is a dominant mechanism for EMI shielding of the composite. An average EMI SE of 23 dB can be achieved in the X-band range for the composite with 25 wt% Ti 3 SiC 2 content, which shows the potential of the Ti 3 SiC 2 /PANI composites as EMI shielding materials for commercial applications.