[期刊论文][RESEARCH ARTICLE]

出版年：2023

Abstract Electromagnetic radiation interference （EMI） or pollution is increased significantly in proportion to the expansion of electronic and communication industries, which lead to the disturbance of the functioning of electronic gadgets and medical equipments, in addition to the human health damage. The Microwave absorbing （MA） composite comprised of polyvinyl alcohol （PVA）, polyaniline （PANI）, carbon nanotube （MWCNT） and iron oxide （Fe₃O₄） has been developed with various proportions, denoted as PVA/PANI/MWCNT/Fe₃O₄ （1%, 3%, 5%）. Fe₃O₄ was prepared using a hydrothermal method, and PVA/PANI/MWCNT/Fe₃O₄ （1%, 3%, 5%） nanocomposites was made by solvent casting techniques. The PVA composite films were also subjected to a range of analyses including IR, TGA, DTA, DTG, SEM, TEM, dielectric measurements and EMI shielding effectiveness （EMI SE）, to describe their characteristics. The results of various studies indicate that the PVA/PANI/MWCNT/Fe₃O₄ （1%, 3%, 5%） composites possess enhanced thermal and dielectric characteristics, for instance the PVA/PANI/MWCNT/5% Fe₃O₄ blend nanocomposites possess 10% initial decomposition at 220°C and dielectric constant of 3.2 × 10⁷ at 1 MHz. The total EMI SE value for the synthetic PVA/PANI/MWCNT/Fe₃O₄ was found at 9.2 and 10 GHz is 48 and 54 dB, respectively, exhibiting synergistic properties of the composites toward EMI shielding. The microwave absorption spectra indicate two absorption peaks in the region around 8 to 12 GHz, with the absorption reflection loss （RL） value of ?20 dB at 10 GHz for the PVA/PANI/MWCNT/5% Fe₃O₄ nanocomposites.

dielectric studies;electromagnetic energy;electromagnetic radiation shielding materials;microwave absorption;polymer nanocomposites;reflection loss