Lu Min, Gao Na, Zhang Xiao-Juan, Wang Guang-Sheng
School of Chemical Engineering, Northeast Electric Power University Jilin 132000 P. R. China.
School of Chemistry, Beihang University Beijing 100191 P. R. China
RSC Adv. 2019 Feb 13;9(10):5550-5556. doi: 10.1039/c8ra10633a. eCollection 2019 Feb 11.
Reduced graphene oxide (RGO) decorated with octahedral NiS/NiS nanocrystals were fabricated a facile synthetic strategy. By appropriate adjustment of the weight ratio of GO and NiS/NiS nanocrystals, RGO-NiS/NiS nanocomposites with an excellent microwave absorption performance were achieved. As expected, RGO-NiS/NiS nanocomposites in a polyvinylidene fluoride (PVDF) matrix with different mass fractions (5, 10, 15, 20 wt%) possess effective absorption in the high frequency range with a thin thickness (1.5 mm) compared with those of octahedral NiS/NiS nanocrystals. It was revealed that RGO-NiS/NiS nanocomposites with a GO : NiS/NiS weight ratio of 1 : 4 exhibited the most prominent microwave absorption property. The optimal effective frequency bandwidth of this sample covers 4.32 GHz at a thin coating layer of 1.5 mm (15 wt%). The corresponding reflection loss value can reach -32.2 dB at 14.32 GHz. Moreover, the fundamental attenuation mechanisms are also discussed in detail.
采用简便的合成策略制备了八面体NiS/NiS纳米晶体修饰的还原氧化石墨烯（RGO）。通过适当调整氧化石墨烯与NiS/NiS纳米晶体的重量比，获得了具有优异微波吸收性能的RGO-NiS/NiS纳米复合材料。正如预期的那样，与八面体NiS/NiS纳米晶体相比，不同质量分数（5、10、15、20 wt%）的聚偏二氟乙烯（PVDF）基体中的RGO-NiS/NiS纳米复合材料在高频范围内具有有效吸收，且厚度较薄（1.5 mm）。结果表明，氧化石墨烯与NiS/NiS重量比为1∶4的RGO-NiS/NiS纳米复合材料表现出最突出的微波吸收性能。该样品在1.5 mm薄涂层（15 wt%）时的最佳有效频率带宽覆盖4.32 GHz。在14.32 GHz时，相应的反射损耗值可达-32.2 dB。此外，还详细讨论了基本衰减机制。
