Electromagnetic interference shielding properties of PMMA modified-Co0.5Zn0.5Fe2O4 − polyaniline composites

Functional Composite Materials Pub Date : 2024-09-09 DOI:10.1186/s42252-024-00059-1

Parthasarathi Bera, R. V. Lakshmi, R. P. S. Chakradhar, Suryasarathi Bose, Harish C. Barshilia

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Abstract

Present work reports solution combustion synthesis (SCS) of Co_0.5Zn_0.5Fe₂O₄ spinel ferrite, its chemical modification with polymethylmethacrylate (PMMA), synthesis of polyaniline (PANI), and electromagnetic interference (EMI) shielding properties of their composites. Both as-prepared and PMMA-modified Co_0.5Zn_0.5Fe₂O₄ adopt cubic spinel structure as shown by X-ray diffraction studies. Field emission scanning electron microscopy images show the agglomerated and microporous nature of the ferrites. High resolution transmission electron microscopy image of as-prepared Co_0.5Zn_0.5Fe₂O₄ shows lattice fringes related to (311) plane of the spinel structure. X-ray photoelectron spectroscopy studies reveal the presence of Co²⁺, Zn²⁺, and Fe³⁺ in tetrahedral and octahedral coordinations in the ferrite. EMI shielding properties are evaluated for PMMA-modified Co_0.5Zn_0.5Fe₂O₄ and PANI composites in different weight ratios. Composites containing PMMA-modified ferrite and PANI with 50:50 and 10:90 weight ratios show the best performance among all the composites in 2−20 GHz frequency range. Optimized PMMA-modified Co_0.5Zn_0.5Fe₂O₄ and PANI composite with the ratio of 10:90 shows shielding effectiveness (SE) values of −16.6 to −24.2 dB in 2−20 GHz frequency region.

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PMMA 改性-Co0.5Zn0.5Fe2O4-聚苯胺复合材料的电磁干扰屏蔽性能

本研究报告介绍了溶液燃烧合成（SCS）Co0.5Zn0.5Fe2O4 尖晶石铁氧体、用聚甲基丙烯酸甲酯（PMMA）对其进行化学改性、合成聚苯胺（PANI）及其复合材料的电磁干扰（EMI）屏蔽性能。X 射线衍射研究表明，原制备的和经 PMMA 改性的 Co0.5Zn0.5Fe2O4 都具有立方尖晶石结构。场发射扫描电子显微镜图像显示了铁氧体的团聚和微孔性质。制备的 Co0.5Zn0.5Fe2O4 的高分辨率透射电子显微镜图像显示了与尖晶石结构的（311）面有关的晶格条纹。X 射线光电子能谱研究显示，铁氧体中存在四面体和八面体配位的 Co2+、Zn2+ 和 Fe3+。对不同重量比的 PMMA 改性 Co0.5Zn0.5Fe2O4 和 PANI 复合材料的 EMI 屏蔽性能进行了评估。在 2-20 GHz 频率范围内，含有 PMMA 改性铁氧体和 PANI（重量比分别为 50:50 和 10:90）的复合材料在所有复合材料中表现出最佳性能。优化的 PMMA 改性 Co0.5Zn0.5Fe2O4 和 PANI 复合材料的重量比为 10:90，在 2-20 GHz 频率范围内显示出 -16.6 至 -24.2 dB 的屏蔽效能（SE）值。

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Functional Composite Materials

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