钴纳米粒子改性石墨烯复合材料的电磁性能

Electromagnetic properties of graphene composites modified with cobalt nanoparticles

摘要:

本文采用化学镀的方法，先后用氯化亚锡敏化、氯化钯活化，在石墨烯表面沉积钴纳米粒子。XRD、TEM结果显示钴在石墨烯表面的晶体结构和含量因钴前驱体盐和还原剂浓度而异。电磁测试结果表明：钴含量的增加和石墨烯的还原均能提升Co-RGO的电导率；同时，Co-RGO纳米复合材料由于具有磁损耗和大量界面引入的介电损耗，吸波性能优异，Co-RGO*1在1~18GHz频段内反射率低于-10dB的频宽约为4GHz，Co-RGO*2在26.5~40GHz频段内反射率均小于-23dB。

关键词:石墨烯;复合材料;钴;纳米粒子;电磁性能

Abstract:

In this paper, cobalt nanoparticles were deposited on the surface of graphene by electroless plating,first sensitization and then activation using stannous chloride and palladium chloride respectively. XRD and TEM results showed that the concentrations of cobalt precursor and reductant affected the structures and yield of cobalt crystals. Electromagnetic tests results showed that the increasing cobalt content and reduction of graphene both improved the conductivity of Co-RGO. Meanwhile, Co-RGO nanocomposites had excellent absorbing properties because of magnetic loss and dielectric loss by lots of interfaces. For instance, the bandwidth of reflection below -10dB for Co-RGO*1 during 1~18GHz was about 4GHz, and the reflection for Co-RGO*2 was below -23dB from 26.5 to 40 GHz.

Key words:graphene; composites; cobalt; nanoparticles; electromagnetic properties