Lithium-substituted magnesium ferrite-polyaniline nanocomposites for X-band electromagnetic interference shielding

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Research Pub Date : 2024-08-16 DOI:10.1557/s43578-024-01415-4

Sumit Kumar, Neelam Singh, Suraj Kumar

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Abstract

The progress of the automated industry produces undesired electromagnetic interference (EMI) that distresses the end-users and functionality of electronic devices. This article develops new composite based on a polyaniline matrix and lithium-substituted magnesium ferrite (Mg0.8Li0.2Fe2O4) nanofiller. The composite was designed to contain both electric and magnetic sources by including polarizable groups in the PANI structure and by loading this matrix with magnetic nanoparticles, respectively. Magnetic analyses indicated a saturation magnetization and coercivity of 32.5 emu gm⁻¹ and 32 Oe, respectively, for the ferrite nanoparticles which reduces to magnetization of 13.5 emu gm⁻¹ with the composite formation. These novel composites are investigated from the point of view of their EMI shielding properties, showing the high shielding effectiveness of 73 dB in X-band frequency region. The composite’s remarkable shielding qualities make it a very promising material for a variety of applications, including radar absorption and stealth technology.

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用于 X 波段电磁干扰屏蔽的锂取代镁铁氧体-聚苯胺纳米复合材料

自动化工业的发展会产生不良的电磁干扰（EMI），对最终用户和电子设备的功能造成困扰。本文开发了基于聚苯胺基体和锂取代镁铁氧体（Mg0.8Li0.2Fe2O4）纳米填料的新型复合材料。通过在 PANI 结构中加入可极化基团以及在基体中加入磁性纳米颗粒，该复合材料被设计为同时包含电源和磁源。磁性分析表明，铁氧体纳米颗粒的饱和磁化率和矫顽力分别为 32.5 emu gm-1 和 32 Oe，在形成复合材料后，磁化率降低到 13.5 emu gm-1。从电磁干扰屏蔽特性的角度对这些新型复合材料进行了研究，结果表明其在 X 波段频率区域的屏蔽效能高达 73 dB。这种复合材料卓越的屏蔽性能使其成为一种非常有前途的材料，可用于雷达吸收和隐形技术等多种应用领域。

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来源期刊

Journal of Materials Research 工程技术-材料科学：综合

CiteScore

4.50

自引率

3.70%

发文量

362

审稿时长

2.8 months

期刊介绍： Journal of Materials Research (JMR) publishes the latest advances about the creation of new materials and materials with novel functionalities, fundamental understanding of processes that control the response of materials, and development of materials with significant performance improvements relative to state of the art materials. JMR welcomes papers that highlight novel processing techniques, the application and development of new analytical tools, and interpretation of fundamental materials science to achieve enhanced materials properties and uses. Materials research papers in the following topical areas are welcome. • Novel materials discovery • Electronic, photonic and magnetic materials • Energy Conversion and storage materials • New thermal and structural materials • Soft materials • Biomaterials and related topics • Nanoscale science and technology • Advances in materials characterization methods and techniques • Computational materials science, modeling and theory