College of Textiles, Donghua University, Shanghai 201620, PR China.
College of Textiles, Donghua University, Shanghai 201620, PR China; Jihua Group Corporation Limited, Beijing 100020, PR China.
Carbohydr Polym. 2022 Jun 15;286:119306. doi: 10.1016/j.carbpol.2022.119306. Epub 2022 Mar 4.
The development of efficient electromagnetic interference (EMI) shielding materials with high electromagnetic waves (EMWs) absorption capacity is of great significance to alleviate secondary EMWs pollution. Herein, multilayered composites were prepared by stacking cellulose nanofibril (CNF)/reduced graphene oxide (rGO) aerogels and rGO film together. The porous aerogels and the dense film serve as the EMWs absorbing layer and reflecting layer, respectively. When the EMWs enter the multilayer composites, they go through the process of absorption-reflection-reabsorption, resulting in a high EMI shielding effectiveness (SE) of ~32 dB. Furthermore, both experimental and theoretical analyses were adopted to explore the effect of arrangement order of CNF/rGO aerogels on EMI shielding performance. The results indicate that composites with progressively higher graphene content exhibit a higher EMWs absorption capacity at the same total EMI SE. This work offers a feasible design for improving EMWs absorption without affecting the overall EMI shielding performance of the material.
开发具有高电磁波（EMWs）吸收能力的高效电磁干扰（EMI）屏蔽材料对于缓解二次 EMWs 污染具有重要意义。在此，通过将纤维素纳米纤维（CNF）/还原氧化石墨烯（rGO）气凝胶和 rGO 薄膜堆叠在一起制备了多层复合材料。多孔气凝胶和致密薄膜分别用作 EMWs 吸收层和反射层。当 EMWs 进入多层复合材料时，它们经历了吸收-反射-再吸收的过程，导致 EMI 屏蔽效能（SE）高达约 32 dB。此外，还采用实验和理论分析来研究 CNF/rGO 气凝胶的排列顺序对 EMI 屏蔽性能的影响。结果表明，在相同的总 EMI SE 下，具有逐渐增加的石墨烯含量的复合材料表现出更高的 EMWs 吸收能力。这项工作为在不影响材料整体 EMI 屏蔽性能的情况下提高 EMWs 吸收能力提供了一种可行的设计。
