Graphene-carbonyl iron cross-linked composites with excellent electromagnetic wave absorption properties
Graphene-carbonyl iron cross-linked composites with excellent electromagnetic wave absorption properties
复制标题
具有优异电磁波吸收性能的石墨烯-羰基铁交联复合材料
DOI：
10.1039/c4tc00757c
复制
发表时间：
2014
影响因子：
6.4
通讯作者：
He Jianping
中科院分区：
文献类型：
--
作者：
Zhu Zetao;Sun Xin;Xue Hairong;Guo Hu;Fan Xiaoli;Pan Xuchen;He Jianping
石墨烯由于其强介电损耗和低密度而成为高效电磁波吸收的非常理想的材料。然而，原始石墨烯的主要缺点，如高介电常数和低磁导率，由于阻抗匹配差，不可避免地限制了其性能。本文采用湿化学法制备了还原氧化石墨烯-球形羰基铁复合材料。正如预期的那样，通过RGO和SCI的组合，可以发现在电磁波吸收中的阻抗匹配的明显改善。采用碳桥效应来解释电磁波吸收过程，这与合成的复合材料的交联骨架结构密切相关。此外，在7.79-11.98 GHz范围内，厚度为3.0 mm的RGO-SCI复合材料表现出有效的电磁波吸收特性（RL < 10 dB），最小反射损耗为−52.46 dB。
Graphene is a highly desirable material for efficient electromagnetic wave absorption due to its strong dielectric loss and low density. However, the main drawbacks in pristine graphene, such as high dielectric constant and low permeability, inevitably limit its performance due to the poor impedance matching. In this paper, reduced graphene oxide–spherical carbonyl iron composites (RGO–SCI) have been successfully fabricated through a facile wet chemical method. As expected, an apparent improvement of impedance matching in electromagnetic wave absorption could be found through the combination of RGO and SCI. A carbon-bridge effect was adopted to explain the electromagnetic wave absorbing process, which is closely related to a cross-linked framework structure of as-synthesized composites. Besides, in the range of 7.79–11.98 GHz with the thickness of 3.0 mm, the RGO–SCI composites exhibited efficient electromagnetic wave absorption characteristics (RL < 10 dB) with a minimum reflection loss of −52.46 dB.