Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University , Xi'an 710072, China.
ACS Appl Mater Interfaces. 2017 Apr 5;9(13):11803-11810. doi: 10.1021/acsami.7b00951. Epub 2017 Mar 27.
Three-dimensional (3D) flexible foams consisting of reduced graphene oxides (rGO) and in situ grown SiC nanowires (NWs) were prepared using freeze-drying and carbothermal 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 thermostable beyond ∼630 °C (90% weight retention in air atmosphere). 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, and 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.
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）和原位生长的碳化硅纳米线（NWs）组成的三维（3D）柔性泡沫。通过将碳化硅纳米线掺入 rGO 泡沫中，复合材料的热稳定性和电磁吸收性能都得到了提高。结果表明，rGO/SiC NW 泡沫在空气气氛中超过约 630°C 时仍具有热稳定性（保留 90%的重量）。正如预期的那样，与纯 rGO 泡沫相比，聚二甲基硅氧烷（PDMS）基质中的 rGO/SiC NW 泡沫在整个 X 波段（8.2-12.4GHz）实现了有效的吸收，其厚度更薄（3mm）。研究表明，具有丰富堆垛层错、孪晶界面和桥接结的碳化硅纳米线除了对互连石墨烯网络的贡献外，还在增强电磁吸收性能方面发挥了重要作用。分层 rGO/SiC NW 泡沫不仅在关键环境中是高效的吸收剂，而且还可以应用于光催化和热管理领域。
