Multilayer polymeric nanocomposites for electromagnetic interference shielding: fabrication, mechanisms, and prospects

Abstract

Fabrication of multilayer EMI shield opens a creative avenue for designing and constructing flexible nanocomposite films simultaneously featuring excellent EMI shielding performance, fascinating heat removal ability, and robust mechanical properties.

Multilayer Structures of a Zn0.5Ni0.5Fe2O4-Reduced Graphene Oxide/PVDF Nanocomposite for Tunable and Highly Efficient Microwave Absorbers

“…According to the literature, − the absorption mechanism is thought to be mainly governed by two phenomena: (1) dipole polarization and (2) interfacial polarization between the metal–organic complexes and the matrix. However, the literature has shown that interfacial polarization relaxes significantly over the X-band frequency range; as such, ,, we believe that the contribution of the interfacial and dipole polarization mechanisms is negligible. Therefore, it can be said that, in the first layer of our multilayer samples, the PVDF/ZnNiFe layer attenuates and absorbs the electromagnetic energy due to hysteresis loss and magnetic domain resonance.…”

“…Multilayer strategy and the abovementioned mechanisms have been proposed in many recent studies. 55 However, the A coe of our proposed nanocomposites supras all the existing works in the literature. We believe that the outstanding absorption performance of shield is a direct result of the excellent insulating and supermagnetic properties of ZnNiFe nanoparticles.…”

“…However, determining the dominant shielding mechanism based on these parameters is not the correct approach as SE R and SE A are the ratios of the input or output powers (relative quantities). As such, A and R should be compared to investigate the shielding mechanisms. , …”

“…As such, A and R should be compared to investigate the shielding mechanisms. 54,55 Figure 5 compares the total EMI SE of the hybrid PVDF/ rGO−ZnNiFe (Figure 5a−d) and two-layer PVDF/rGO− ZnNiFe nanocomposites (Figure 5e−h). The dielectric loss and magnetic loss occur due to rGO nanosheets and ZnNiFe nanoparticles, respectively.…”

A Simple Approach to Control the Physical and Chemical Features of Custom-Synthesized N-Doped Carbon Nanotubes and the Extent of Their Network Formation in Polymers: The Importance of Catalyst to Substrate Ratio

“…In line with the demand for miniaturization [ 12 , 13 ] and optimization in the electronics industry, instead of conventional strategies, such as coating and surface modification of CNTs [ 14 , 15 ] or the use of hybrid additives [ 16 , 17 ], tuning specific intrinsic properties of CNTs in synthesis procedure seems to be a more effective and viable method to achieve the desired properties, meeting the requirements of advanced electrical applications. By altering synthesis parameters, such as temperature [ 18 ] to CNT substrates [ 19 ], and also by doping with different heteroatoms (nitrogen, boron, phosphorus, so forth), CNTs with different properties can be acquired.…”