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.
Highlights
Electromagnetic interference (EMI) has become a major problem with the exponential growth of more small and functional electronic devices
We study how MoS2 can alter the nature of a polymer composite by replacing carbon-based nanofillers for EMI shielding applications
Polystyrene (PS) commercial grade was purchased from ERKOL, Istanbul, Turkey, whereas aniline monomers were provided by Uni CHEM chemical reagents (Beograd, Serbia), which were purified through distillation
Summary
Electromagnetic interference (EMI) has become a major problem with the exponential growth of more small and functional electronic devices. Electronic components (such as high speed processors) produce unwanted electromagnetic energy, affecting the performance and lifetime of other such components by interference [1,2,3]. It may cause loss of stored data, and temporary as well as permanent disruption of important functions. In order to reduce this pollution, researchers are working extensively to produce materials having both conductive as well as magnetic behavior, which could shield EM waves [6,7,8,9,10]. Metals and magnets were used to reduce the EM pollution
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