Characterization of Electrical Properties

Pütz, Jörg; Heusing, Sabine; Aegerter, Michel A.

doi:10.1007/978-3-319-19454-7_52-1

Cited by 2 publications

(2 citation statements)

References 114 publications

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“…The magnified FESEM image of sample J also indicated the existence of many small-sized CNFs on the CMCs surfaces (see Figure 2 b,c). As previously reported, the small-sized CNFs around the CMCs seem to have a hybridized aspect between the CNFs and CMCs by the cyclic process of SF 6 flow [ 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ]. This result suggests that the cyclic SF 6 flow with the injection of H 2 gas could produce CNFs–CMCs hybrids [ 40 ].…”

Section: Resultsmentioning

confidence: 78%

“…A coaxial sample holder and a coaxial transmission test specimen were set up according to the waveguide method. The scattering parameters (S 11 and S 21 ) were measured in the frequency range of 1.5−40 GHz using the VNA [ 34 , 35 , 36 , 37 , 38 ]. The power coefficients, namely reflectivity ( R ), absorptivity ( A ), and transmissivity ( T ), were calculated using the following equations: R = P R / P I = |S 11 | 2 and T = P T / P I = |S 21 | 2 , where P I , P R , P A , and P T are the incident, reflected, absorbed, and transmitted powers of an electromagnetic wave, respectively [ 38 ].…”

Section: Methodsmentioning

confidence: 99%

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Enhancement of Electromagnetic Wave Shielding Effectiveness by the Incorporation of Carbon Nanofibers–Carbon Microcoils Hybrid into Commercial Carbon Paste for Heating Films

et al. 2023

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Carbon microcoils (CMCs) were formed on stainless steel substrates using C2H2 + SF6 gas flows in a thermal chemical vapor deposition (CVD) system. The manipulation of the SF6 gas flow rate and the SF6 gas flow injection time was carried out to obtain controllable CMC geometries. The change in CMC geometry, especially CMC diameter as a function of SF6 gas flow injection time, was remarkable. In addition, the incorporation of H2 gas into the C2H2 + SF6 gas flow system with cyclic SF6 gas flow caused the formation of the hybrid of carbon nanofibers–carbon microcoils (CNFs–CMCs). The hybrid of CNFs–CMCs was composed of numerous small-sized CNFs, which formed on the CMCs surfaces. The electromagnetic wave shielding effectiveness (SE) of the heating film, made by the hybrids of CNFs–CMCs incorporated carbon paste film, was investigated across operating frequencies in the 1.5–40 GHz range. It was compared to heating films made from commercial carbon paste or the controllable CMCs incorporated carbon paste. Although the electrical conductivity of the native commercial carbon paste was lowered by both the incorporation of the CMCs and the hybrids of CNFs–CMCs, the total SE values of the manufactured heating film increased following the incorporation of these materials. Considering the thickness of the heating film, the presently measured values rank highly among the previously reported total SE values. This dramatic improvement in the total SE values was mainly ascribed to the intrinsic characteristics of CMC and/or the hybrid of CNFs–CMCs contributing to the absorption shielding route of electromagnetic waves.

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