Attenuation of electromagnetic microwaves by a sandwich-like hybrid nanocomposite of reduced graphene oxide and amine-functionalized magnetic mesoporous silica
- Authors
- Thi, Quyen Vu; Tung, Ngo Trinh; Sohn, Daewon
- Issue Date
- Aug-2019
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Reduced graphene oxide; Fe3O4; Mesoporous silica; Electromagnetic absorber; X-Ku band
- Citation
- SYNTHETIC METALS, v.254, pp.68 - 74
- Indexed
- SCIE
SCOPUS
- Journal Title
- SYNTHETIC METALS
- Volume
- 254
- Start Page
- 68
- End Page
- 74
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/13244
- DOI
- 10.1016/j.synthmet.2019.06.007
- ISSN
- 0379-6779
- Abstract
- A hybrid composite with a sandwich-like structure constructed from reduced graphene oxide (rGO) and magnetic Fe3O4 particles coated mesoporous SiO2 (Fe3O4@mSiO2) is reported. For better adhesion of Fe3O4@mSiO2 on the rGO sheets, the surface of the Fe3O4@mSiO2 was modified with amonopropyltriethoxysilane to form amine-functionalized magnetic mesoporous silica (AMS). The anchoring of AMS particles on the surface of rGO in the resulting reduced graphene oxide/amine-functionalized magnetic mesoporous silica (rGAMS) hybrid greatly improved exfoliation of the rGO sheets. The as-synthesized rGAMS readily absorbed microwave radiation in epoxy composites. An rGAMS absorber with 10 wt% filler loading had an effective absorption bandwidth of 9.8 GHz in the frequency from 8.2 to 18 GHz, and the minimum reflection loss was -49.4 dB at 13.4 GHz. The adhesion of AMS particles not only induced a high specific surface area, but also acted as loci for microwave entrapment due to magnetic loss caused by their intrinsic porosity.
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