Chang Mi Se, Kwon Suk Jin, Jeong Jae Won, Ryu Seung Han, Jeong Seung Jae, Lee Kyunbae, Kim Taehoon, Yang Sangsun, Park Chong Rae, Park Byeongjin, Kwon Young-Tae
Metal Powder Department, Korea Institute of Materials Science (KIMS), Changwon 51508, South Korea.
Carbon Nanomaterials Design Laboratory, Global Research Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul 08826, South Korea.
ACS Appl Mater Interfaces. 2022 Aug 31;14(34):39255-39264. doi: 10.1021/acsami.2c11094. Epub 2022 Aug 17.
Electromagnetic wave (EMW)-absorbing materials, manufactured with composites of magnetic particles, are essential for maintaining a high complex permeability and modulated permittivity for impedance matching. However, commonly available EMW-absorbing materials are unsatisfactory owing to their low complex permeability in the high-frequency band. Herein, we report a thin, flexible EMW-absorbing membrane comprising shape-modulated FeCo nanobelts/boron nitride nanoparticles, which enables enhanced complex permeability in the S, C, and X bands (2-12 GHz). The boron nitride nanoparticles that are introduced to the FeCo nanobelts demonstrate control of the complex permittivity, leading to an effective impedance matching close to 1, consequently resulting in a high reflection loss value of -42.2 dB at 12.0 GHz with only 1.6 mm thickness. In addition, the incorporation of boron nitride nanoparticles improves the thermal conductivity for the heat dissipation of the absorbed electromagnetic wave energy. Overall, the comprehensive study of nanomaterial preparation and shape modulation technologies can lead to the fabrication of an excellent EMW-absorbing flexible composite membrane.
由磁性颗粒复合材料制成的电磁波吸收材料对于维持高复磁导率和调制介电常数以实现阻抗匹配至关重要。然而，常见的电磁波吸收材料由于其在高频波段的低复磁导率而不尽人意。在此，我们报道了一种由形状调制的FeCo纳米带/氮化硼纳米颗粒组成的薄型柔性电磁波吸收膜，它能够在S、C和X波段（2-12GHz）提高复磁导率。引入到FeCo纳米带中的氮化硼纳米颗粒表现出对复介电常数的控制，从而实现接近1的有效阻抗匹配，结果在仅1.6mm厚度时，在12.0GHz处产生-42.2dB的高反射损耗值。此外，氮化硼纳米颗粒的加入提高了热导率，有利于吸收的电磁波能量的散热。总体而言，对纳米材料制备和形状调制技术的综合研究能够促成优异的电磁波吸收柔性复合膜的制造。
