Flexible and Thermostable Graphene/SiC Nanowire Foam Composites with Tunable Electromagnetic Wave Absorption Properties
Flexible and Thermostable Graphene/SiC Nanowire Foam Composites with Tunable Electromagnetic Wave Absorption Properties
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DOI：
10.1021/acsami.7b00951
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发表时间：
2017-04-05
影响因子：
9.5
通讯作者：
Cheng, Laifei
中科院分区：
文献类型：
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作者：
Han, Meikang;Yin, Xiaowei;Cheng, Laifei
采用冷冻干燥和碳热还原工艺制备了由还原氧化石墨烯（rGO）和原位生长SiC纳米线（NW）组成的三维（3D）柔性泡沫。通过将SiC纳米线引入到rGO泡沫中，复合材料的热稳定性和电磁吸收性都得到了改善。结果表明，rGO/SiCNW泡沫材料具有热稳定性。超过630 ℃时稳定（在空气中保持90%重量）。正如预期的那样，在聚（二甲基硅氧烷）基质中的rGO/SiC NW泡沫实现了在整个X波段（8.2-12.4 GHz）的有效吸收，与纯rGO泡沫相比，具有更薄的厚度（3 mm）。结果表明，除了互连的石墨烯网络的贡献外，具有丰富堆垛层错、孪晶界面和桥接结的SiC纳米线在增强电磁吸收性能方面也起着重要作用。分级结构的rGO/SiC NW泡沫材料不仅在临界环境下具有良好的吸收性能，而且在光催化和热管理领域也有着广泛的应用前景。
Three-dimensional (3D) flexible foams consisting of reduced graphene oxides (rGO) and in situ grown SiC nanowires (NWs) were prepared using freeze-drying and carbothernial reduction processes. By means of incorporating SiC nanowires into rGO foams, both the thermostability and electromagnetic absorption of the composites were improved. it was demonstrated that rGO/SiC NW foams were thermoz. stable beyond similar to 630 degrees C (90% weight retention in air attnosphere). As expected, rGO/SiC NW foams in the poly(dimethylsiloxane) matrix achieved' effective absorption in the entire X-band (8.2-12.4 GHz) with a thinner thickness (3 mm) in comparison with those of the pure rGO foams. It is revealed that SiC nanowires with abundant stacking faults, twinning interfaces, arid bridged junctions play an important role in the enhanced electromagnetic absorption performance) in addition to the,contribution of interconnected graphene networks. Hierarchical rGO/SiC NW foams not only are efficient absorbers in the critical environments but also can be applied in photocatalytic and thermal -management fields.