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Design and microwave absorption properties of thistle-like CoNi enveloped in dielectric Ag decorated graphene composites
Journal of Colloid and Interface Science ( IF 9.9 ) Pub Date : 2018-09-06 , DOI: 10.1016/j.jcis.2018.09.016
Na Zhang , Ying Huang , Mingyue Wang , Xudong Liu , Meng Zong

A novel hierarchical composites for coupling thistle-like CoNi with dielectric Ag decorated graphene in paraffin wax as high performance microwave absorber has been synthesized by a facile two-step strategy. The components, particle size, microstructure and morphology of the resulting composites are characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectra, scanning electron microscope, transmission electron microscopy and energy dispersive X-ray spectroscopy, etc. Due to the unique flower structure and good synergistic effect of dielectric loss and magnetic loss, thistle-like [email protected] Ag decorated graphene composites have showed glorious microwave absorption intensity and frequency width. The maximum reflection loss of −61.9 dB can be gained at 6.96 GHz, which has rarely been reported yet. In addition, the corresponding effective bandwidth with reflection loss less than −10 dB is 5.6 GHz ranging from 12.4 to 18 GHz at only 1.67 mm thickness. This highly efficient and broad band features endow thistle-like [email protected] Ag decorated graphene composites with promising applications in microwave absorption, electromagnetic shielding, information safety, direct broadcast satellite and military radar fields.



中文翻译:

包裹在电介质银装饰石墨烯复合材料中的类似蓟的CoNi的设计和微波吸收性能

通过一种简便的两步策略,合成了一种新型的分层复合材料,该复合材料用于将类似蓟的CoNi与介电的Ag装饰的石墨烯偶联在石蜡中作为高性能微波吸收剂。通过X射线衍射,X射线光电子能谱,拉曼光谱,扫描电子显微镜,透射电子显微镜和能量色散X射线光谱等对所得复合材料的成分,粒度,微观结构和形态进行表征。独特的花朵结构以及介电损耗和磁损耗的良好协同作用,蓟状[受电子邮件保护] Ag装饰的石墨烯复合材料具有出色的微波吸收强度和频率宽度。在6.96 GHz时可以获得-61.9 dB的最大反射损耗,这鲜有报道。此外,反射损耗小于-10 dB的相应有效带宽为5.6 GHz,厚度仅为1.67 mm,范围为12.4至18 GHz。这种高效且宽带的特性赋予了类似蓟的[电子邮件保护] Ag装饰石墨烯复合材料,在微波吸收,电磁屏蔽,信息安全,直播卫星和军用雷达领域具有广阔的应用前景。

更新日期:2018-09-06
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