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Freeze-Dried Carbon Nanotube Aerogels for High-Frequency Absorber Applications
KTH, School of Electrical Engineering and Computer Science (EECS), Micro and Nanosystems. (MST)ORCID iD: 0000-0002-6260-2694
KTH, School of Electrical Engineering and Computer Science (EECS), Micro and Nanosystems.ORCID iD: 0000-0002-8514-6863
KTH, School of Electrical Engineering and Computer Science (EECS), Micro and Nanosystems.ORCID iD: 0000-0003-1443-403X
KTH, School of Electrical Engineering and Computer Science (EECS), Micro and Nanosystems.ORCID iD: 0000-0003-3339-9137
2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, ISSN 1944-8244, Vol. 10, no 23, p. 19806-19811Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018. Vol. 10, no 23, p. 19806-19811
Keywords [en]
carbon nanotubes; freeze-drying; millimeter wave absorbers; reflectivity; waveguide loads
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-233878DOI: 10.1021/acsami.8b03983ISI: 000435525100057Scopus ID: 2-s2.0-85047536864OAI: oai:DiVA.org:kth-233878DiVA, id: diva2:1244278
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QC 20180904

Available from: 2018-08-31 Created: 2018-08-31 Last updated: 2018-10-01Bibliographically approved

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Anoshkin, Ilya V.Campion, JamesLioubtchenko, Dmitri V.Oberhammer, Joachim

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