Reduced Graphene Oxide/Barium Ferrite Ceramic Nanocomposite Synergism for High EMI Wave Absorption.

The developed nanocomposite exhibits significantly enhanced shielding performance due to the synergistic effect of high dielectric and magnetic loss materials, which modifies the material’s impedance and improves its absorption ability. Different weight percentages (0, 1, 5, 10, 15, 20, and 25 wt %) of thermally treated chemically reduced graphene oxide (TCRGO) were combined with two types of magnets, barium hexaferrite (BF) and magnetite (MAG), using a dry powder compaction technique to produce binary ceramic nanocomposite sheets. The shielding performance of a 1 mm thick compressed nanoceramic sheet over the X-band was evaluated using a vector network analyzer. The 25% TCRGO showed high shielding performance for both BF and MAG, while BF had a total shielding efficiency (SET) that exceeded MAG by 130%. The SET of 25 wt % TCRGO/BF was 52 dB, with a 41 dB absorption shielding efficiency (SEA). Additionally, the effect of different levels of incident electromagnetic wave power (0.001–1000 mW) at various thicknesses (1, 2, and 5 mm) was explored. At 1000 mW, the 5 mm TCRGO/BF had an SET of 99 dB, an SEA of 91 dB, and a reflection shielding efficiency (SER) of 8 dB. The use of BF as a hard magnet paired with TCRGO exhibited excellent and stable electromagnetic shielding performance.

由于高介电和磁损耗材料的协同效应，所开发的纳米复合材料表现出显著增强的屏蔽性能，这种协同效应改变了材料的阻抗并提高了其吸收能力。采用干粉压实技术，将不同重量百分比（0、1、5、10、15、20和25 wt%）的热处理化学还原氧化石墨烯（TCRGO）与两种磁体——钡铁氧体（BF）和磁铁矿（MAG）相结合，制备二元陶瓷纳米复合片材。使用矢量网络分析仪评估了1毫米厚的压缩纳米陶瓷片材在X波段的屏蔽性能。25%的TCRGO对BF和MAG都显示出高屏蔽性能，而BF的总屏蔽效能（SET）比MAG高130%。25 wt% TCRGO/BF的SET为52分贝，吸收屏蔽效能（SEA）为41分贝。此外，还探究了不同厚度（1、2和5毫米）下不同入射电磁波功率水平（0.001 - 1000毫瓦）的影响。在1000毫瓦时，5毫米的TCRGO/BF的SET为99分贝，SEA为91分贝，反射屏蔽效能（SER）为8分贝。将BF作为硬磁体与TCRGO搭配使用，表现出优异且稳定的电磁屏蔽性能。