PS/PANI/MoS2 Hybrid Polymer Composites with High Dielectric Behavior and Electrical Conductivity for EMI Shielding Effectiveness

Abstract

Liquid exfoliated molybdenum disulfide (MoS2) nanosheets and polyaniline (PANI) nanoparticles are dispersed in polystyrene (PS) matrix to fabricate hybrid polymer composites with high dielectric and electromagnetic interference (EMI) shielding behavior. A phase-separated morphology is formed when PANI and MoS2 are incorporated into polystyrene (PS) matrix. An increasing concentration of MoS2 nanoparticles inside PS/PANI (5 wt %) polymer blend forms an interconnected network, resulting in high electrical conductivity and dielectric behavior, making them a suitable candidate for EMI shielding application. An increment in dielectric constant and loss, up to four and five orders of magnitude, respectively, is recorded at a maximum concentration of 1 wt % of MoS2 in PS/PANI-5 polymer blend at 100 Hz. The enhanced dielectric characteristics for PS/PANI/MoS2 composites are then theoretically evaluated for the estimation of EMI shielding effectiveness in the frequency range of 100 Hz to 5 MHz. The maximum dielectric constant and loss achieved for PS/PANI-5 wt %/MoS2-1 wt % are responsible for estimated shielding effectiveness of around 92 dB at 100 Hz. The increase in dielectric behavior and shielding effectiveness is probably due to the increased number of charged dipoles accumulated at the insulator–conductor interface.

The tunable electric and magnetic properties of 2D MXenes and their potential applications

“…The MoS 2 material is semiconductors (bandgap of ∼1.2 eV) with parabolic energy dispersion relation. The bandgap can be tuned by quantum confinement effect lead by different surface morphology; hence MoS 2 shows the candidacy for EMI shielding application 55,56 . As compared to 2D graphene, pure MoS 2 has lower electron conductivity and lower permittivity due to poor charge transfer.…”

Recent Advancement in Rational Design Modulation of MXene: A Voyage from Environmental Remediation to Energy Conversion and Storage

“…Because the quantum restraint impact caused by distinct interfacial morphological features could optimize the band structure, therefore MoS 2 is an applicant for EMI sheltering functionalities. [388,389] Pure MoS 2 has reduced charge carrier permeability and transmittance than 2D graphene due to poor charge transport. Another issue with TMDs is that feeble van der Waals dynamics induce compaction of specific lateral strands of MoS 2 , that can result in impedance unmatching among the EM waves and the scattering content.…”

“…The MoS 2 sample is a nanomaterial with a hyperbolic fuel dissipation connection (band structure of 1.2 eV). Because the quantum restraint impact caused by distinct interfacial morphological features could optimize the band structure, therefore MoS 2 is an applicant for EMI sheltering functionalities [388,389] . Pure MoS 2 has reduced charge carrier permeability and transmittance than 2D graphene due to poor charge transport.…”

Graphene-ferrites interaction for enhanced EMI shielding effectiveness of hybrid polymer composites

“…Hybrid polymer composites are used in various areas of applications due to their ease of processing, noncorrosiveness, light weight and flexibility. One such utilization is to employ them for the growing concern of EMI pollution especially in digital electronics & communication field [1][2][3][4][5][6][7][8][9]. The choice of both matrix and fillers may be tailored according to their content and related interaction.…”