Reduced Graphene Oxide/Barium Ferrite Ceramic Nanocomposite Synergism for High EMI Wave Absorption,ACS Omega

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Reduced Graphene Oxide/Barium Ferrite Ceramic Nanocomposite Synergism for High EMI Wave Absorption
ACS Omega ( IF 3.7 ) Pub Date : 2023-04-20 , DOI: 10.1021/acsomega.2c08168
Ramy Sadek ₁ , Mohammad S Sharawi ₂ , Charles Dubois ₁ , Hesham Tantawy ₃ , Jamal Chaouki ₁

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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.

中文翻译：

用于高 EMI 波吸收的还原氧化石墨烯/铁氧体陶瓷纳米复合材料协同作用

由于高介电和磁损耗材料的协同作用，开发的纳米复合材料显示出显着增强的屏蔽性能，这改变了材料的阻抗并提高了其吸收能力。将不同重量百分比（0、1、5、10、15、20 和 25 wt%）的经过热处理的化学还原氧化石墨烯 (TCRGO) 与两种类型的磁体结合，六铁酸钡 (BF) 和磁铁矿 (MAG)，使用干粉压实技术生产二元陶瓷纳米复合板。使用矢量网络分析仪评估了 1 毫米厚的压缩纳米陶瓷片在 X 波段的屏蔽性能。25% TCRGO 对 BF 和 MAG 均显示出高屏蔽性能，而 BF 的总屏蔽效率 (SET) 超过 MAG 130%。25 wt% TCRGO/BF 的 SET 为 52 dB，吸收屏蔽效率 (SEA) 为 41 dB。此外，还探讨了不同厚度（1、2 和 5 毫米）下不同水平的入射电磁波功率 (0.001–1000 mW) 的影响。在 1000 mW 时，5 mm TCRGO/BF 的 SET 为 99 dB，SEA 为 91 dB，反射屏蔽效率 (SER) 为 8 dB。使用 BF 作为硬磁体与 TCRGO 配对，表现出优异且稳定的电磁屏蔽性能。

更新日期：2023-04-20

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