石墨烯含量对熔融沉积成形复合试样吸波性能的影响 下载: 884次
利用熔融沉积成形技术快速制备了石墨烯/聚乳酸单组元复合试样和石墨烯/纳米Fe3O4/聚乳酸双组元复合试样,并研究了石墨烯含量对上述试样吸波性能的影响。结果表明:当石墨烯质量分数为8%时,单组元复合试样的吸波性能较佳;在双组元复合试样中,当纳米Fe3O4含量一定时,提高石墨烯含量能明显改善试样的吸波性能;双组元复合试样的吸波性能优于单组元复合试样;石墨烯包覆在基体表面形成的褶皱会增加电磁波多重反射的次数,但石墨烯含量过多时,石墨烯因团聚产生的电子散射会影响吸波效果;相比单组元复合试样,双组元复合试样在石墨烯及纳米Fe3O4的双重作用下形成的微观界面种类更多,使得电磁波的传播路径更为复杂,电磁波能量消耗得更多,因此将不同损耗类型的吸波剂进行复合可以有效提高材料的吸波性能。
Graphene/polylactic acid single-component composites and graphene/nano-Fe3O4/polylactic acid two-component composites were rapidly prepared using fused deposition molding technology, and the effect of graphene content on absorbing properties was examined. Single-component samples exhibit better wave absorption performance with an 8% mass fraction of graphene. In the two-component composite, with a constant nano-Fe3O4 mass fraction, increasing graphene content obviously improves the wave absorption performance of the sample. Furthermore, the wave absorption performance of two-component composite samples is better than that of the single-component composite sample. Folds formed by graphene coating on the substrate surface can increase the number of multiple reflections of electromagnetic wave. However, when graphene content is too large, electron scattering, which is generated by graphene agglomeration, affects the wave absorption effect. Compared with the single-component composite sample, the two-component composite sample has more types of micro interfaces under the dual action of graphene and nano-Fe3O4, which renders electromagnetic wave propagation path more complex, thereby consuming more energy. Therefore, compounding different types of absorbing agents can effectively improve the wave absorption performance of the material.
吴海华, 邢垒, 蔡宇, 刘力, 范雪婷, 叶永盛, 李波, 田小永. 石墨烯含量对熔融沉积成形复合试样吸波性能的影响[J]. 激光与光电子学进展, 2020, 57(23): 231601. Haihua Wu, Lei Xing, Yu Cai, Li Liu, Xueting Fan, Yongsheng Ye, Bo Li, Xiaoyong Tian. Effect of Graphene Content on Microwave Absorption Properties of Fused Deposited Composite Samples[J]. Laser & Optoelectronics Progress, 2020, 57(23): 231601.