Reflection and Absorption Contribution to the EMI Shielding Efficiency of SWCNT-Polymer Composites

Abstract

Materials that protect against electromagnetic interference (EMI) with high shielding effectiveness (SE) have gained great importance due to their applications in telecommunication sectors , electronic, aerospace, medical, and military devices. Metals perform well as EMI shields, but they are relatively heavy and inflexible, with greater sensitivity to oxidation. In contrast, the prototyping of polymer conductive composites suggests that they are more chemically stable, cost-effective, and easier to process as shielding materials than their metal counterparts. Metal polymer nano composites are advanced materials for high electrical conductivity, which are critical for the synthesis of conductive polymer nano composites using extremely low amounts of conductive filler. A nano tube SWCNT-polymer system which utilizes functional group interactions for achieving uniform dispersion with low electrical percolation concentrations and enhanced microwave shielding effectiveness and light weight than other shielding materials . Analysis of the total observed EMI shielding was used for investigating the mechanisms of absorption and reflection in the composite. The aim of this thesis is to using functionalized CNT-polymer composites together with our obtained results could be used as a basis for light-weight, high shielding efficiency materials for EMI applications. SWCNT composites with well-dispersed SWCNTs were prepared using a simple physical mixing method and increasing shielding efficiencies