Greener synthesis of lightweight, self‐standing <scp>PMMA</scp>/<scp>CoFe₂O₄</scp> polymeric film for magnetic, electronic, and terahertz shielding applications

Abstract

Abstract This work aims to develop a multifunctional PMMA/CoFe 2 O 4 polymeric film of low loss dielectric constant, high magnetic properties, and perceptible terahertz shielding effectiveness. Pure cobalt ferrite magnetic nanoparticles (CoFe 2 O 4 MNPs) were prepared by a facile‐modified solution deposition method. Then, the nanoparticles were loaded to poly (methyl methacrylate) of different ratios ( x = 0, 5, 10, 15, and 20 wt%) to synthesize films by evaporative casting technique. X‐ray diffraction (XRD) evidenced the formation of CoFe 2 O 4 MNPs in the cubic spinal structure. The FTIR confirmed the interaction of CoFe 2 O 4 MNPs with PMMA chains. Compared to the pure PMMA, the PMMA/CoFe 2 O 4 nanocomposites were more thermally stable, as evidenced by thermogravimetric analysis, (TGA) and differential scanning calorimetry (DSC). The micrograph images by FESEM unraveled that CoFe 2 O 4 MNPs have formed in different geometrical shapes (nanocubes, nanotubes, and nano oval). The values of the band gap energy were computed by the absorption spectra fitting (ASF) method. It varied from 4.94 to 4.68 eV, as the CoFe 2 O 4 MNPs contents were changed from 0 to 20 wt%. Compared to host PMMA, the dielectric permittivity was enhanced, while the dielectric loss was slightly decreased. Therefore, the prepared film can be employed as a passive component in electronic circuits, namely capacitors and supercapacitors. The shielding effectiveness (SE) was found to be improved with frequency and CoFe 2 O 4 content, reflecting the applicability of PMMA/CoFe 2 O 4 MNPs films in terahertz shielding. The magnetic parameters were investigated by a vibrating sample magnetometer (VSM) and were found to increase with CoFe 2 O 4 content, which could be used as a flexible film in magnetic applications.

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