Synthesis and microwave absorption studies on 2D graphitic carbon nitride loaded polyaniline/polyvinyl alcohol nanocomposites

Abstract

A light weight electromagnetic interference (EMI) shielding and microwave absorbing composite films has been developed by loading varying weight content of graphitic carbon nitride (g-C3N4) nanosheets and polyaniline (PANI) into polyvinyl alcohol (PVA) matrix. The prepared PVA/PANI/g-C3N4 (1%, 3%, 5%) composites has been subjected to FTIR, X-Ray powder diffraction, SEM, Thermal studies, Dielectric studies and electromagnetic shielding effectiveness (EMI SE) analysis. The PVA/PANI/g-C3N4 (1%, 3%, 5%) composites was discovered to have improved electrical conductivity, dielectric loss, and dielectric constant. It is observed from the SEM images that the sheet layers of g-C3N4 are wrapped by the polymer matrix and the morphology to PVA/PANI composite in the g-C3N4 indicates homogeneous blending of PVA/PANI without any phase separation and has porous in it. The PANI/g-C3N4 fractured surfaces present are smooth but irregular in appearance indicating good compatibility between the PVA and PANI matrices. The dielectric properties was found to increase on increasing the concentration of the g-C3N4 nanofiller and reached a maximum of 9.8 × 106 at 1 MHz for 3% g-C3N4 in PVA/PANI. The incorporation of g-C3N4 into PVA/PANI enhanced the conductivity and the 5% g-C3N4 loaded composite film exhibited a conductivity value of 0.043 S/cm at 1 MHz. The PVA/PANI/g-C3N4 (1%, 3%, 5%) composites exhibited potential EMI SE values ranging from 24 to 35 dB at 8.6 GHz and from 42 to 63 dB at 12.4 GHz, for instance the PVA/PANI/g-C3N4 5% composite showed highest value of 63 dB at 12.4 GHz. The PVA/PANI/g-C3N4 5% exhibits the maximum highest reflection loss 8 GHz–12 GHz in which the higher absorption of −36 dB is observed at 10.3 GHz of the X-band region.

Flexural property characterization and structure analysis of graphene‐reinforced polyphenylene sulfide prepared via low‐cost pellet‐based material extrusion additive manufacturing

“…Studies have shown that the incorporation of particle, fiber, or nanomaterial reinforcements into polymers can create polymer matrix composites with high performance and/or excellent functionals 23–25 . GNP is also a preferable conductive medium with superior thermal stability 26–28 . Similarly, related studies have shown that GNP has a direct effect on electromagnetic radiation shielding, 29,30 which suggests that GNP has promising applications in composite modification.…”

“…[23][24][25] GNP is also a preferable conductive medium with superior thermal stability. [26][27][28] Similarly, related studies have shown that GNP has a direct effect on electromagnetic radiation shielding, 29,30 which suggests that GNP has promising applications in composite modification. The addition of graphene oxide (GO) is increasingly applied in polymer nanocomposites to tailor their properties further.…”

Enhanced microwave absorption properties of magnetite nanoparticles decorated multi walled carbon nanotubes loaded polyaniline/polyvinyl alcohol nanocomposites

“…In addition, high-frequency electromagnetic waves (EM waves) like microwave and radio frequency influence are individual transmitted all around us as an outcome of the quick growth and meteoric increase in the electronic gadgets and their uses. [2][3][4][5][6] The primary goal of research on radar stealth materials is to enhance the absorption capabilities for EMWs in the X-band frequency range. 7 Due to the exponential expansion of smaller and more useful electronic devices, recent advancements in telephony and electronics have significantly worsened the electromagnetic interference (EMI) problem.…”

“…Humans benefit greatly from the use of electromagnetic waves (EMWs), which dominate wireless communication and detecting technology, and the threat from electromagnetic attack to defense is also very real. In addition, high‐frequency electromagnetic waves (EM waves) like microwave and radio frequency influence are individual transmitted all around us as an outcome of the quick growth and meteoric increase in the electronic gadgets and their uses 2–6 …”

Flexible Multilayered Poly(vinylidene fluoride)/Graphene-Poly(vinylidene fluoride) Films for Efficient Electromagnetic Shielding

“…Filling the conductive material into a flexible matrix is deemed to be a way to earn flexible EMI SE composites . In such a case, polystyrene, poly­(methyl methacrylate), poly­(vinyl alcohol), polyimide, polyurethane, polypropylene, epoxy resin, and poly­(vinylidene fluoride) (PVDF) are often used as the flexible matrixes, , and among them, PVDF is recommended due to its excellent flexibility, lightweight, processability, and dielectric properties . Therefore, many flexible EMI SE composites based on PVDF have been developed for potential practical applications. − It is reported that the EMI SE performance of Ag/graphite/PVDF flexible composite films prepared by Kumaran et al via embedding Ag nanoparticles into graphite was measured to be 29.1 dB at 12.4 GHz .…”