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Freeze-Dried Carbon Nanotube Aerogels for High-Frequency Absorber Applications
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- Anoshkin, Ilya V. (author)
- KTH,Mikro- och nanosystemteknik,MST
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- Campion, James, 1989- (author)
- KTH,Mikro- och nanosystemteknik
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- Lioubtchenko, Dmitri V. (author)
- KTH,Mikro- och nanosystemteknik
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- (creator_code:org_t)
- 2018-05-22
- 2018
- English.
- In: ACS Applied Materials and Interfaces. - : American Chemical Society (ACS). - 1944-8244 .- 1944-8252. ; 10:23, s. 19806-19811
- Journal article (peer-reviewed)
Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- carbon nanotubes; freeze-drying; millimeter wave absorbers; reflectivity; waveguide loads
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- ref (subject category)
- art (subject category)
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