Magnetite Nano Hollow Spheres: Efficient and Tunable Electro- Magnetic wave Absorber

2019 IEEE MTT-S International Microwave and RF Conference (IMARC) Pub Date : 2019-12-01 DOI:10.1109/IMaRC45935.2019.9118658

D. Mandal, K. Mandal

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引用次数: 1

Abstract

Design of a proper microwave absorbing material with light-weight, broad-band and higher stability for the fields of both electromagnetic interference (EMI) shielding and radar stealth has still remained a challenge. Herein, Magnetite nano hollow spheres (FO NHS) of diameter ~ 285 nm are prepared by template free facile solvothermal method and their magnetic, dielectric and microwave absorption properties are investigated. A minimum reflection loss (RL) ~ −35.8 dB is observed at ~ 11.7 GHz on composite filled with epoxy resin (20 wt% and thickness of 2 mm) with a broad band width of 9-12 GHz frequency region with RL ≤ −10 dB i.e. absorption > 90%. Also, in the studied X-Band (8-12 GHz) multiple peak regions with effective absorption are found. Hollow core of NHS suggests multiple internal reflections of incident wave with higher surface area and lower density. Throughout the frequency region, shielding efficiency (SE) maintains a value < −10 dB and a high value (~ 115) of attenuation constant (α) is observed. These properties of FO NHS make it a promising candidate for applications towards Communication devices, Information security and EMI shielding.

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磁铁矿纳米空心球:高效可调电磁波吸收剂

设计一种既适用于电磁干扰屏蔽又适用于雷达隐身的轻量化、宽频带和高稳定性的吸波材料仍然是一个挑战。本文采用无模板易溶溶剂热法制备了直径~ 285 nm的磁铁矿纳米空心球(FO NHS)，并对其磁性、介电和微波吸收性能进行了研究。在~ 11.7 GHz频段，环氧树脂填充(wt%，厚度为2mm)的复合材料的最小反射损耗(RL)为~ - 35.8 dB，且RL≤- 10 dB，即吸收> 90%。在研究的x波段(8-12 GHz)中发现了有效吸收的多峰区。NHS的空心核心意味着入射波的多次内反射，具有更高的表面积和更低的密度。在整个频率区域，屏蔽效率(SE)保持在<−10 dB，衰减常数(α)保持在~ 115。FO - NHS的这些特性使其成为通信设备、信息安全和EMI屏蔽应用的有希望的候选者。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2019 IEEE MTT-S International Microwave and RF Conference (IMARC)

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