Efficient terahertz radiation absorption by dilute graphene composites

被引:13
作者
Barani, Zahra [1 ,2 ]
Stelmaszczyk, Kamil [3 ]
Kargar, Fariborz [1 ,2 ]
Yashchyshyn, Yevhen [3 ,4 ]
Cywinski, Grzegorz [3 ]
Rumyantsev, Sergey [3 ]
Balandin, Alexander A. [1 ,2 ]
机构
[1] Univ Calif Riverside, Dept Elect & Comp Engn, Nanodevice Lab, Riverside, CA 92521 USA
[2] Univ Calif Riverside, Phonon Optimized Engn Mat Ctr, Riverside, CA 92521 USA
[3] Polish Acad Sci, Inst High Pressure Phys, CENTERA Labs, PL-01142 Warsaw, Poland
[4] Warsaw Univ Technol, Inst Radioelect & Multimedia Technol, PL-00665 Warsaw, Poland
关键词
CARBON MATERIALS; GRAPHITE; CONDUCTIVITY; EXFOLIATION; PERFORMANCE;
D O I
10.1063/5.0079891
中图分类号
O59 [应用物理学];
学科分类号
摘要
The interaction of terahertz electromagnetic radiation with dilute graphene-epoxy composites was studied experimentally at frequencies from 0.25 to 4 THz. Composites with low graphene loading (& LE;1.2 wt. %) below the electrical percolation threshold revealed the total shielding effectiveness above & SIM;70 dB (1 mm thickness) at 1.6 THz frequency. The unexpected high shielding effectiveness of dilute graphene composites in blocking terahertz radiation was mostly achieved by absorption rather than reflection. The shielding effectiveness increases with increasing frequency. Our results suggest that even the thin-film or spray coatings of the lightweight, electrically insulating graphene composites with thicknesses in the few-hundred-micrometer range can be sufficient for blocking terahertz radiation in many practical applications.
引用
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页数:7
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