RGO/ANFs复合气凝胶的制备及电磁屏蔽性能

本研究通过化学水热还原法制备RGO，并将其引入到化学劈裂法制备的ANF基体中，进而采用冷冻干燥法制备了可压缩回弹、高效电磁屏蔽性能的RGO/ANFs复合气凝胶，系统研究了不同RGO添加量对RGO/ANFs复合气凝胶的微观形貌、导电性能、力学性能和电磁屏蔽性能的影响。研究表明：当RGO添加量为20 wt.%时，复合气凝胶电导率达到15.84 S/cm，电磁屏蔽效能高达22 dB， 30%压缩应变时，压缩应力可达21 kPa。气凝胶自身的多孔结构与RGO良好的导电性能共同赋予了复合气凝胶优异的电磁屏蔽性能，这种兼具电磁屏蔽性能与力学性能的复合气凝胶有望应用于通信、微电子和航空航天等领域。

Preparation of RGO/ANFs composite aerogels and their electromagnetic shielding properties

In this study, RGO was obtained by chemical hydrothermal reduction method, and ANF was prepared by chemical splitting method. With ANF with high mechanical properties as matrix, RGO with strong electrical properties was introduced, and RGO/ANFs composite aerogel with compressible spring back and high electromagnetic shielding efficiency was prepared by freeze-drying method. The effects of different amounts of RGO on the microstructure, electrical conductivity, mechanical properties and electromagnetic shielding properties of RGO/ANFs aerogels were systematically studied. The results showed that when the mass fraction was 20 wt.%, the electrical conductivity of the system was as high as 15.84 S/cm, and the electromagnetic shielding efficiency could reach 22 dB. When the 30% compression strain, the compressive stress could reach 21 kPa. The spongy porous structure increased the multiple reflection of the incident electromagnetic wave and improved the electromagnetic shielding performance, making the three-dimensional RGO/ANFs composite aerogel an ideal and efficient electromagnetic shielding material with both mechanical properties and electromagnetic shielding performance. The composite aerogel with both electromagnetic shielding and mechanical properties is expected to be used in communication, microelectronics, aerospace and other fields.