Electromagnetic shielding effectiveness improvement with high temperature in far‐field behavior multiwall carbon nanotube/iron ( III ) particles addition in composites

2020 ◽  
Vol 41 (9) ◽  
pp. 3678-3686 ◽  
Author(s):  
Tahar Merizgui ◽  
Abdechafik Hadjadj ◽  
Mecheri Kious ◽  
Bachir Gaoui
Keyword(s):  
High Temperature ◽  
Carbon Nanotube ◽  
Electromagnetic Shielding ◽  
Multiwall Carbon Nanotube ◽  
Far Field ◽  
Shielding Effectiveness ◽  
Field Behavior ◽  
Electromagnetic Shielding Effectiveness ◽  
Multiwall Carbon

scholarly journals Multiwall Carbon Nanotube–Epoxy Composites With High Shielding Effectiveness for Aeronautic Applications

2012 ◽  
Vol 54 (1) ◽  
pp. 28-36 ◽  
Author(s):  
Aidin Mehdipour ◽  
Iosif Daniel Rosca ◽  
Christopher W. Trueman ◽  
Abdel-Razik Sebak ◽  
Suong Van Hoa
Keyword(s):  
Carbon Nanotube ◽  
Epoxy Composites ◽  
Multiwall Carbon Nanotube ◽  
Shielding Effectiveness ◽  
Multiwall Carbon

scholarly journals Electromagnetic Shielding Effectiveness and Conductivity of PTFE/Ag/MWCNT Conductive Fabrics Using the Screen Printing Method

2020 ◽  
Vol 12 (15) ◽  
pp. 5899
Author(s):  
Hung-Chuan Cheng ◽  
Chong-Rong Chen ◽  
Shan-hui Hsu ◽  
Kuo-Bing Cheng
Keyword(s):  
Electrical Conductivity ◽  
Electromagnetic Interference ◽  
Electromagnetic Shielding ◽  
Multiwall Carbon Nanotube ◽  
Shielding Effectiveness ◽  
Ptfe Film ◽  
Conductive Films ◽  
Hybrid Grid ◽  
Electromagnetic Shielding Effectiveness ◽  
Mwcnt Loading

The management of the electromagnetic interference (EMI) of thin, light, and inexpensive materials is important for consumer electronics and human health. This paper describes the development of conductive films that contain a silver (Ag) flake powder and multiwall carbon nanotube (MWCNT) hybrid grid on a polytetrafluoroethylene (PTFE) film for applications that require electromagnetic shielding (EMS) and a conductive film. The Ag and MWCNT hybrid grid was constructed with a wire diameter and spacing of 0.5 mm. The results indicated that the proposed conductive films with 0.4 wt% MWCNTs had higher electromagnetic shielding effectiveness (EMSE) and electrical conductivity than those with other MWCNT loading amounts. The results also showed that the film with 0.4 wt% MWCNT loading had a high 62.4 dB EMSE in the 1800 MHz frequency and 1.81 × 104 S/cm electrical conductivity. This combination improved stretchability, with 10% elongation at a 29% resistivity change rate. Conductive films with Ag/MWCNT electronic printing or lamination technologies could be used for EMI shielding and electrically conductive applications.

scholarly journals Crossover Frequency and Transmission-Line Matrix Formalism of Electromagnetic Shielding Properties of Laminated Conductive Sheets

2018 ◽  
Vol 7 (2) ◽  
pp. 28-35
Author(s):  
S. M. Benhamou ◽  
M. Hamouni ◽  
F. Ould-Kaddour
Keyword(s):  
Carbon Nanotube ◽  
Transmission Line ◽  
Polymer Composites ◽  
Electromagnetic Shielding ◽  
Matrix Formalism ◽  
Crossover Frequency ◽  
Shielding Effectiveness ◽  
Transmission Line Matrix ◽  
Shielding Properties ◽  
Electromagnetic Shielding Effectiveness

This paper proposes an approach to calculate the crossover frequency of each layer in the multilayered shield and subsequently that of structure constructed by n layers. This important frequency provides a useful approximation for field penetration in a conductor. It is used in a wide variety of calculations. It is in this context that a simplification of the transmission-line matrix formalism for laminated conductive sheets is done using this frequency. Two ranges of frequency are considered: lower and higher than the crossover frequency. Simples formulas and easy to use of the reflection loss, the internal reflection, the absorption loss and the electromagnetic shielding effectiveness of laminated shield are obtained. Analysis is carried out for the study of two shields: i) single shield of carbon nanotube polymer composites (CNTs), ii) multilayered shield constructed with Nickel–carbon nanotube polymer composites–Aluminum (Ni–CNTs–Al).

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