Dielectric and electromagnetic shielding behavior of CaCu3Ti4O12/CoFe2O4/silicone rubber composites

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/s43578-024-01416-3

Neelam Kumari, Shivali Meena, Amena Salim, Rahul Singhal, Vishant Gahlaut, Jigar Limbachiya, Bhuwaneshwar Semwal, Ravi Hegde, Umesh Kumar Dwivedi

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Abstract

With mushrooming of wireless wearable devices, demand of efficient electromagnetic interference (EMI) shielding material gained much interest to obstruct the unwanted radiations. This paper reports the fabrication of CaCu₃Ti₄O₁₂(CCTO)/CoFe₂O₄(CFO)/silicone composites and investigation of their dielectric and EMI shielding characteristics. The EMI shielding effectiveness and dielectric properties of prepared composites are evaluated for different compositions of CaCu₃Ti₄O₁₂ (50, 35, 25, 15 wt%) and CoFe₂O₄ (0, 15, 25, 35 wt%) in silicone matrix. The dielectric constant found maximum (~ 50) for CCS-3 composite. The CaCu₃Ti₄O₁₂/CoFe₂O₄/silicone composites (0 and 35% CoFe₂O₄) exhibited total shielding effectiveness (SE_T ~ 6 dB) corresponds to 75% shielding efficiency in X-band. By introducing magnetic filler with CaCu₃Ti₄O₁₂ in silicone matrix, better EMI attenuation is remarkably achieved. The shielding mechanism displays synergistic contribution of magnetic particles, colossal dielectric particles, and insulating elastomeric matrix. This work provides an avenue for developing better electromagnetic radiation shielding material for wearable electronics, and dielectric resonators.

Graphical abstract

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CaCu3Ti4O12/CoFe2O4 硅橡胶复合材料的介电和电磁屏蔽行为

随着无线可穿戴设备如雨后春笋般涌现，人们对高效电磁干扰（EMI）屏蔽材料的需求越来越大，以阻挡不必要的辐射。本文报告了 CaCu3Ti4O12(CCTO)/CoFe2O4(CFO)/silicone 复合材料的制备及其介电和 EMI 屏蔽特性的研究。针对硅基体中 CaCu3Ti4O12（50、35、25、15 wt%）和 CoFe2O4（0、15、25、35 wt%）的不同成分，对所制备复合材料的 EMI 屏蔽效果和介电特性进行了评估。发现 CCS-3 复合材料的介电常数最大（~ 50）。CaCu3Ti4O12/CoFe2O4/硅树脂复合材料（0 和 35% CoFe2O4）的总屏蔽效果（SET ~ 6 dB）相当于 X 波段 75% 的屏蔽效率。通过在有机硅基体中引入含 CaCu3Ti4O12 的磁性填料，可显著提高 EMI 衰减效果。屏蔽机制显示了磁性颗粒、巨型介质颗粒和绝缘弹性基质的协同作用。这项研究为开发用于可穿戴电子设备和介质谐振器的更好的电磁辐射屏蔽材料提供了一种途径。

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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