期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 23, 页码 19806-19811出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b03983
关键词
carbon nanotubes; freeze-drying; millimeter wave absorbers; reflectivity; waveguide loads
资金
- European Research Council (ERC) [616846]
- H2020 Innovative Training Network CELTA of Call: H2020-MSCA-ITN-2015 [675683]
A novel technique for millimeter wave absorber material embedded in a metal waveguide is proposed. The absorber material is a highly porous carbon nanotube (CNT) aerogel prepared by a freeze-drying technique. CNT aerogel structures are shown to be good absorbers with a low reflection coefficient, less than -12 dB at 95 GHz. The reflection coefficient of the novel absorber is 3-4 times lower than that of commercial absorbers with identical geometry. Samples prepared by freeze-drying at -25 degrees C demonstrate resonance behavior, while those prepared at liquid nitrogen temperature (-196 degrees C) exhibit a significant decrease in reflection coefficient, with no resonant behavior. CNT absorbers of identical volume based on wet-phase drying preparation show significantly worse performance than the CNT aerogel absorbers prepared by freeze-drying. Treatment of the freeze-dried CNT aerogel with n- and p-dopants (monoethanolamine and iodine vapors, respectively) shows remarkable improvement in the performance of the waveguide embedded absorbers, reducing the reflection coefficient by 2 dB across the band.
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