Poly(Vinylidene Fluoride)/Cu@Ni Anchored Reduced-graphene Oxide Composite Films with Folding Movement to Boost Microwave Absorption Properties
Biao Zhao, Luyang Liang, Zhongyi Bai, Xiaoqin Guo, Rui Zhang, Qinglong Jiang, Zhanhu Guo
Abstract
The influence of reduced graphene oxide (rGO)/Cu@Ni loading and foldable structure on the microwave absorption properties of poly(vinylidene fluoride) (PVDF)/rGO/Cu@Ni composite films were investigated in detail. The microwave absorption properties of the PVDF/rGO/Cu@Ni composite films increased with the rGO/Cu@Ni content increased and then decreased, which was due to the variation of impedance match. Additionally, the foldable structure was found to play a decisive role in tunable and strong microwave absorption. The minimal reflection loss of -49.1 dB could be obtained for foldable PVDF/20 wt% rGO/Cu@Ni with a thickness of 2.5 mm, and the bandwidth (below -20 dB, 99% dissipation) could reach 6.4 GHz (18.5-19.3 GHz, 20.7-26.5 GHz).