Tailorable microwave absorption properties of RGO/SiC/CNT nanocomposites with 3D hierarchical structure
Tailorable microwave absorption properties of RGO/SiC/CNT nanocomposites with 3D hierarchical structure
复制标题
具有3D分级结构的RGO/SiC/CNT纳米复合材料的可定制微波吸收性能
DOI：
10.1016/j.ceramint.2020.04.137
复制
发表时间：
2020-08-01
影响因子：
5.2
通讯作者：
Zhang, Litong
中科院分区：
文献类型：
--
作者：
Hou, Zexin;Xue, Jimei;Zhang, Litong
在本研究中，制备了一种由化学气相渗透（CVI）碳化硅（SiC）和催化剂辅助化学气相沉积（CACVD）碳纳米管（CNTs）组成的新型复合陶瓷，该复合陶瓷由三维（3D）层状结构的还原氧化石墨烯（RGO）泡沫（RGO/SiC/CNT）组成，具有厚度小、重量轻、宽带吸收性能强的特点。氧化石墨烯层与碳化硅纳米颗粒、碳化硅和碳纳米管网络之间的双重非均相纳米界面导致偶极子和界面极化显著增加。碳纳米管含量为1.27 wt%的复合陶瓷具有覆盖整个x波段（8.2-12.4 GHz）的有效吸收带宽（EAB），并且在厚度为2.9 mm的9.8 GHz处反射损耗最小为- 20 dB。由于独特的三维多尺度分层多孔结构，该材料具有非常低的密度（约0.7 g cm(-3)）。本研究结果为制备轻质、高性能的陶瓷基电磁波吸收材料提供了一种有前途和可设计的方法。
In this study, a new composite ceramic consisting of chemical vapor infiltrated (CVI) silicon carbide (SiC) and catalyst-assisted chemical vapor deposited (CACVD) carbon nanotubes (CNTs) on three-dimensional(3D) laminated-structure of reduced graphene oxide (RGO) foam (RGO/SiC/CNT) with a small thickness, lightweight, and robust broadband absorption properties was produced. The dual heterogeneous nanointerfaces between the RGO layers and SiC nanograins, SiC, and CNT network, resulted in a significant increase in the dipole and interfacial polarisation. The composite ceramics with a CNT content of 1.27 wt% exhibit an effective absorption bandwidth (EAB) that covers the entire X-band (8.2-12.4 GHz) and a minimal reflection loss of - 20 dB at 9.8 GHz for a thickness of 2.9 mm. Owing to the unique 3D multi-scale hierarchical porous structure, the material has a very low density (approximately 0.7 g cm(-3)). The results of this study present a promising and designable approach for the preparation of lightweight and high-performance ceramic-based electromagnetic wave (EMW) absorption materials.