Broadband electromagnetic characterization of carbon foam to metal contact

Micheli, Davide; Morles, Ramon Bueno; Marchetti, M.; Moglie, Franco; Primiani, Valter Mariani

doi:10.1016/j.carbon.2013.10.074

Cited by 80 publications

(35 citation statements)

References 18 publications

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“…The value of σ was obtained by fitting the experimental data below, and seems realistic for porous glassy carbon with density ρ = 0.39 g/cm 3 since it is in good agreement with recent published results 6,43 . The spatial distribution of effective dielectric permittivity (1) calculated at 30 GHz is presented in Fig.6.…”

Section: A Homogenisation Proceduresmentioning

confidence: 58%

Fully carbon metasurface: Absorbing coating in microwaves

Bychanok

Gorokhov

et al. 2017

Journal of Applied Physics

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The microwave-absorbing properties of a heterostructure consisting of an ordered monolayer of porous glassy carbon spheres were experimentally and theoretically investigated in the Ka-band (26-37 GHz) frequency range. The electromagnetic response of such "moth-eye"-like all-carbon metasurface at a normal incidence angle was modelled on the basis of long-wave approximation. Modelling parameters in the Ka-band were used to estimate and predict the absorption properties of monolayers in free space in the range 1-40 GHz. Experimental and theoretical results demonstrate that a metasurface based on porous glassy carbon spheres is an inert, lightweight, compact and perfectly absorbing material for designing new effective microwave absorbers in various practically used frequency ranges.

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Section: A Homogenisation Proceduresmentioning

confidence: 58%

Fully carbon metasurface: Absorbing coating in microwaves

Bychanok

Gorokhov

et al. 2017

Journal of Applied Physics

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“…These are: (i) the foam density (and/or mean cell size) may have a significant effect on the overall EMI SE, and (ii) the contribution of absorption / reflection mechanisms to EM attenuation strongly depends on the cellular microstructure and can change from almost absorptive to almost reflective from dilute to compact structures, respectively [10]. A very recent work [11] reports one more relevant issue that has to be taken into account for modeling and prototyping absorbing/shielding devices on the basis of carbon foams: a poor electrical contact of the metal with the highly porous structure of the carbon foam can somehow reduce the EMI shielding effectiveness of the latter. However, up to now the value of complex dielectric permittivity of carbon foams in microwave frequency range is unknown.…”

Section: Introductionmentioning

confidence: 98%

“…Recently, the electromagnetic (EM) properties of carbon foams have become an important research topic in the field of EM interference suppression [6][7][8][9][10][11]. All the authors indeed observed in these materials high electromagnetic shielding efficiency in the range of microwave frequencies, along with sufficiently large dielectric losses in the radio frequency range.…”

Section: Introductionmentioning

confidence: 99%

Microwave Dielectric Properties of Tannin-Based Carbon Foams

et al. 2015

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International audienceDielectric analysis of tannin-based carbon foams with different pore sizes, produced at different densities, was carried out in wide microwave frequency range (8GHz - 35GHz). Both dielectric permittivity and electrical conductivity of carbon foams at 8GHz, were high, i.e. more than 70 and close to 10 S/m respectively, and increased with carbon foams density according to power laws. High microwave complex dielectric permittivity values of carbon foams reported here, along with other valuable properties such as ``green'' origin, low price, lightness, chemical inertness, thermal stability and high conductivity in static regime, open new routes for producing effective electromagnetic shields and filters from tannin-based carbonaceous porous structures

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“…Examples include electrochemical storage and conversion, adsorption, vibration damping and impact or sound absorption, catalysis, electromagnetic shielding, radar absorption, filtration, etc. [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 98%

A novel carbon foam: making carbonaceous “lather” from biomass

Lei

Cao

2015

J Mater Sci

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Carbon foams have attracted much attention since they were first developed in 1960s. Most of the reported carbon foams are of thick cell walls, which do not make effective use of the carbon skeleton in application. Herein, we present a biomass-derived carbon foam with nano-thickness carbonaceous walls. Different from the conventional oven heating process, the carbon foam was prepared with the assistance of microwave irradiation within only a few minutes. The prepared carbon foam has reticular morphology. The meshes of the network are in the dimensions ranging from about 10-50 lm and connected by thin carbonaceous walls with thickness of about 25 nm. The carbon foam has narrowly distributed slit mesopores around 2-4 nm. Active groups like hydroxyl, carbonyl, and epoxy groups are detected in its structure. It has potential to be applied as electrochemical material or catalyst support.

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Broadband electromagnetic characterization of carbon foam to metal contact

Cited by 80 publications

References 18 publications

Fully carbon metasurface: Absorbing coating in microwaves

Fully carbon metasurface: Absorbing coating in microwaves

Microwave Dielectric Properties of Tannin-Based Carbon Foams

A novel carbon foam: making carbonaceous “lather” from biomass

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