The microwave conductivity and permittivity of both single-walled and multi-walled carbon nanotube (SWCNT and MWCNT) sponges were measured while compressing the samples. Compression leads to a huge variation of the absorptance, reflectance, and transmittance of the samples. The dependence of the microwave conductivity on the sponge density follows a power-law relation with exponents 1.7 +/- 0.1 and 2.0 +/- 0.2 for MWCNT and SWCNT sponges, respectively. These exponents can be decreased slightly by the addition of a non-conducting component which partly electrically separates adjacent tubes within the samples. The conductivity of MWCNT sponge was measured in the terahertz range while heating in air from 300 to 513 K and it increased due to an increase of a number of conducting channels in MWCNTs.

Shuba, M.v., Yuko, D.i., Kuzhir, P.p., Maksimenko, S.a., Crescenzi, M.d., Scarselli, M. (2018). Carbon nanotube sponges as tunable materials for electromagnetic applications. NANOTECHNOLOGY, 29(37), 375202 [10.1088/1361-6528/aacf3c].

Carbon nanotube sponges as tunable materials for electromagnetic applications

Crescenzi, M De;Scarselli, M
2018-09-14

Abstract

The microwave conductivity and permittivity of both single-walled and multi-walled carbon nanotube (SWCNT and MWCNT) sponges were measured while compressing the samples. Compression leads to a huge variation of the absorptance, reflectance, and transmittance of the samples. The dependence of the microwave conductivity on the sponge density follows a power-law relation with exponents 1.7 +/- 0.1 and 2.0 +/- 0.2 for MWCNT and SWCNT sponges, respectively. These exponents can be decreased slightly by the addition of a non-conducting component which partly electrically separates adjacent tubes within the samples. The conductivity of MWCNT sponge was measured in the terahertz range while heating in air from 300 to 513 K and it increased due to an increase of a number of conducting channels in MWCNTs.
14-set-2018
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/03 - FISICA DELLA MATERIA
English
carbon nanotubes; 3D network; microwave absorption; conductivity
Shuba, M.v., Yuko, D.i., Kuzhir, P.p., Maksimenko, S.a., Crescenzi, M.d., Scarselli, M. (2018). Carbon nanotube sponges as tunable materials for electromagnetic applications. NANOTECHNOLOGY, 29(37), 375202 [10.1088/1361-6528/aacf3c].
Shuba, Mv; Yuko, Di; Kuzhir, Pp; Maksimenko, Sa; Crescenzi, Md; Scarselli, M
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/207873
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