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The effect of microstructure of graphene foam on microwave absorption properties
Journal of Magnetism and Magnetic Materials ( IF 2.7 ) Pub Date : 2018-07-01 , DOI: 10.1016/j.jmmm.2018.03.023
Shubin Cao , Hongbo Liu , Li Yang , Yanhong Zou , Xiaohong Xia , Hui Chen

Abstract The graphene foam (GF) was prepared by reducing graphene oxide (GO) with l -ascorbic acid ( l -AA), followed by freeze-drying. Through changing the initial concentration of GO solution, several GFs with different microstructure could be obtained. The higher the initial concentration of GO, the more obviously the layered stacking of graphene sheet. According to the study, GFs with honeycomb microstructure possessed excellent performance on microwave absorption (MA). When the concentration of GO was 2 mg/ml, the resulting sample GF2 showed the best MA properties. When the thickness of the sample GF2 was 2 mm and the mass content of GF2 in the sample was only 3 wt%, the absolute value of the maximum reflection loss (|RL max |) of GF2 could reach 41.0 dB at 16.2 GHz. And 11 GHz bandwidth of RL less than −5 dB, covering the whole Ku, X and half the Xc band, was achieved by GF2 with the thickness of 3 mm.

中文翻译:

石墨烯泡沫微结构对微波吸收性能的影响

摘要 通过用l-抗坏血酸(l-AA)还原氧化石墨烯(GO),然后冷冻干燥制备石墨烯泡沫(GF)。通过改变 GO 溶液的初始浓度,可以获得几种具有不同微观结构的 GFs。GO初始浓度越高,石墨烯片层状堆积越明显。根据该研究,具有蜂窝状微结构的 GFs 具有优异的微波吸收 (MA) 性能。当 GO 的浓度为 2 mg/ml 时,所得样品 GF2 显示出最好的 MA 特性。当样品GF2的厚度为2 mm且样品中GF2的质量含量仅为3 wt%时,GF2的最大反射损耗绝对值(|RL max |)在16.2 GHz时可达41.0 dB。RL小于−5 dB的11 GHz带宽,覆盖整个Ku,
更新日期:2018-07-01
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