Effect of Coral‐Shaped Yttrium Iron Garnet Particles on the EMI Shielding Behaviour of Yttrium Iron Garnet‐Polyaniline‐Wax Composites

Abstract

We report the physicochemical insight into the role of coralshaped yttrium-iron-garnet (YIG) particles for high electromagnetic interference (EMI) shielding behaviour of YIG-polyaniline (PANI)-Wax composites. We studied the total shielding effectiveness (SE T ) of various compositions of the composites in X and K u -band frequencies (8-18 GHz) and came upon with a critical concentration (20 wt% of YIG) for which SE T is maximum (-44.8 dB). At this critical concentration, the coral shape of YIG helps in effectively increasing the YIG-PANI interfaces necessary for the multiple scattering of electromagnetic (EM) waves. The scattered microwave is then trapped within the dense coralnetwork of YIG until they are absorbed therein by PANI via conduction loss; thereby, dramatically enhancing the microwave attenuation. The detailed EMI shielding mechanism is explained based on electrical and magnetic properties of the composites. Our result demonstrates the importance of morphology of the dielectric/magnetic particles and their concentration in the composites for designing an efficient EMI shield.

Conducting Polymeric Composites Based on Intrinsically Conducting Polymers as Electromagnetic Interference Shielding/Microwave Absorbing Materials—A Review

“…Choudhary et al also investigated the effect of coral-shaped yttrium iron garnet (a soft ferrimagnetic material) on the EMI SE of the corresponding PAni-based hybrids [94]. Also in this system, the best amount of the magnetic YIG corresponded to 20%.…”

Room-temperature production of silver-nanofiber film for large-area, transparent and flexible surface electromagnetic interference shielding

“…4a, a comparison was made between AgNF with a density of 0.2 g cm −3 and other EMI shielding materials, including CNT, 19,52,53 rGO, 20,54 graphene, 21,[55][56][57][58] stainless steel fiber, 7 silver NW, 16 copper NW, 17 nickel hybrid fiber, 7,59 carbon fiber, 7 and some ceramic materials. [59][60][61] Moreover, the specific EMI SE of AgNF is orders of magnitude higher than that of graphene, 22,62 copper, 63 stainless steel, 63 nickel fiber, 63 carbon fiber, 63 and CNT. 20 Owing to the low density of fiber structure, 37 ultralight AgNF film the specific EMI SE of AgNF reach~5000 dB cm 3 g −1 , which is higher than most EMI shielding material have been used (Fig.…”

Solid and macroporous Fe3C/N-C nanofibers with enhanced electromagnetic wave absorbability

“…Apparently, the solid Fe 3 C/N-doped carbon nanocomposites present the optimal reflection loss value. Perhaps it is because the solid Fe 3 C/N-doped carbon nanofibers have the larger coercivity force and higher iron content 54 , 55 . Moreover, the proper impedance matching also plays a major role in its superior EM wave absorbing properties.…”