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Electromagnetic properties of graphene aerogels made by freeze-casting

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Title
Electromagnetic properties of graphene aerogels made by freeze-casting
Author(s)
Le Quan; Chunhui Wang; Yali Xu; Jinlin Qiu; Hanyang Zhang; Benjamin Cunning; Ming Huang; Huijie Wei; Won Kyung Seong; Jaehong Seo; Wang, Huan; Qin, Faxiang; Zhu, Jinfeng; Peng, Hua-Xin; Rodney S. Ruoff
Publication Date
2022-01
Journal
Chemical Engineering Journal, v.428
Publisher
Elsevier B.V.
Abstract
© 2021We report a comprehensive analysis of the Electromagnetic (EM) properties of graphene aerogel-based shielding materials prepared by freeze casting. Controlling the freeze casting temperature allows for tailoring the pore sizes of graphene aerogels, which further affects the permittivity and EM shielding properties. To protect the aerogel structures from collapsing during high temperature heat-treatment, we used Melamine sponge (MS) as a supporting strut. Through a comparison with bare aerogels, we find that the presence of MS can significantly modify both the reflection and absorption performances and that an absorption-dominated shielding material can be obtained. After heat-treatment at 1000 °C for two hours, the MS-supported aerogel sample (MS-aero) showed a shielding efficiency of 55.8 dB. Our work shows that the material composition and the microstructural architecture of aerogels crucially influence their electromagnetic shielding efficiency.
URI
https://pr.ibs.re.kr/handle/8788114/10222
DOI
10.1016/j.cej.2021.131337
ISSN
1385-8947
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > 1. Journal Papers (저널논문)
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