Preparation of sandwich-like CNs@rGO nanocomposites with enhanced microwave absorption properties
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Preparation of sandwich-like CNs@rGO nanocomposites with enhanced microwave absorption properties Qilong Sun1,2, Yingying Cai1,2, Lei Sun3, Wei Ye1,2,* Yue Ji1,2, and Ru Wang1,2
, Xiaoyun Long1,2, Sijun Xu1,2,
1
Fiber Composites for Safety and Protection, National and Local Joint Engineering Research Center of Technical, Nantong University, Nantong 226019, Jiangsu, People’s Republic of China 2 College of Textiles and Clothing, Nantong University, Nantong 226019, Jiangsu, People’s Republic of China 3 Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda 386-8567, Japan
Received: 26 May 2020
ABSTRACT
Accepted: 18 September 2020
Herein, functionalized carbon nanospheres (CNs) are encapsulated within reduced graphene oxide (rGO) layers as a high-performance microwave-absorbing material. The obtained sandwich-like CNs@rGO nanocomposite is characterized by a wellmatched characteristic impedance and multiple dielectric relaxation processes, resulting in a strong reflection loss (–33.09 dB at 14.01 GHz) and broad effective bandwidth of 12.2–17.6 GHz (5.4 GHz) with a low thickness of 2.0 mm, which is superior to many reported carbon absorbers and even some magnetic absorbers. This remarkable microwave absorption property is ascribed to the sandwich structure, indicating that the as-prepared sandwich-like CNs@rGO nanocomposites are potential candidates for lightweight microwave absorption materials.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
GRAPHIC ABSTRACT
Handling Editor: Naiqin Zhao. Qilong Sun and Yingying Cai have contributed equally to this work.
Address correspondence to E-mail: [email protected]
https://doi.org/10.1007/s10853-020-05350-7
J Mater Sci
Introduction The widespread use of electronic equipment has raised significant concerns regarding device interference, information safety, and human health, thereby promoting the rapid development of microwave absorbers. Recently, graphene has gained considerable attention for application in electromagnetic fields because of its high dielectric loss, lightweight, and large specific surface area. Nevertheless, pure graphene is barely suitable as a microwave absorber because of the interfacial impedance mismatch [1]. Thus, graphene is often used together with other microwave-absorbing materials, particularly magnetic particles, to enhance its microwave absorption properties. Wang et al. [1] prepared an Fe–Co nanoporous carbon/graphene composite and found that the addition of an Fe–Co alloy could benefit impedance matching. Shi et al. [2] synthesized a 3-D porous Fe3O4/graphene composite foam and demonstrated that a particular structure was beneficial to enhancing its microwave absorption properties. Similarly, in our previous work, we synthesized Fe3O4-intercalated rGO composites [3], wherein Fe3O4 was stably inserted into the rGO layers, forming a typical sandwich structure. The reflection loss (RL) revealed that the max value reached -49.53 dB with a bandwidth of 2.96 GHz. Although these composites ex
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