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Freeze-Dried Carbon...
Freeze-Dried Carbon Nanotube Aerogels for High-Frequency Absorber Applications
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- Anoshkin, Ilya V. (författare)
- KTH,Mikro- och nanosystemteknik,MST
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- Campion, James, 1989- (författare)
- KTH,Mikro- och nanosystemteknik
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- Lioubtchenko, Dmitri V. (författare)
- KTH,Mikro- och nanosystemteknik
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- Oberhammer, Joachim, Professor (författare)
- KTH,Mikro- och nanosystemteknik
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(creator_code:org_t)
- 2018-05-22
- 2018
- Engelska.
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Ingår i: ACS Applied Materials and Interfaces. - : American Chemical Society (ACS). - 1944-8244 .- 1944-8252. ; 10:23, s. 19806-19811
- Relaterad länk:
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https://kth.diva-por... (primary) (Raw object)
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http://kth.diva-port...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- carbon nanotubes; freeze-drying; millimeter wave absorbers; reflectivity; waveguide loads
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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