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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The influence of the transparent layer thickness on the absorption capacity of epoxy/carbon nanotube buckypaper at X-band

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Author(s):
dos Reis, Felipe Carlos [1] ; Rezende, Mirabel Cerqueira [1] ; Ribeiro, Bruno [1]
Total Authors: 3
Affiliation:
[1] Univ Fed Sao Paulo UNIFESP, Inst Ciencia & Tecnol, Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Journal of Applied Polymer Science; v. 138, n. 47 JUL 2021.
Web of Science Citations: 0
Abstract

Carbon nanotube films (BPs) as EMI shielding materials can be applied in electronic and communication devices due to their high electrical conductivity. Sandwich structures can offer excellent shielding effectiveness by introducing a wave-transmitting layer between conductive films. However, the optimization of the structure demands a deep investigation and plays a crucial role in the final shielding properties of the composites. In this work, BPs are incorporated into epoxy substrates with variable thicknesses (1-6 mm) to fabricate epoxy/BP sandwich structures. The morphology of the CNT films is analyzed by SEM, and the electrical conductivity of all prepared samples is measured by 4-point method. The electromagnetic tests are carried out in the X-band (8.2-12.4 GHz) through the scattering parameters. SEM images reveal a porous structure without visible agglomeration. The electrical conductivity of the BP reaches up to 996 S/m, whereas the values for epoxy/BP composites varies in the range of 8.51-3.13 S/m (1 to 3 mm). BP total shielding efficiency (SET) is approximately 14 dB along the X-band spectrum, with similar contributions of reflection and absorption losses. While, the composites show mainly absorbing behavior, especially in the thicker samples, with more significant SET values (23.4 dB-6 mm). (AU)

FAPESP's process: 17/04740-0 - PREPARATION AND CHARACTERIZATION OF MULTIFUNCTIONAL NANOSTRUCTURED COMPOSITES BASED ON GLASS FIBER/EPOXI RESIN/CARBON NANOTUBE BUCKYPAPER LAMINATE
Grantee:Bruno Ribeiro
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 19/01623-8 - Electrical and electromagnetic characterization of multi-walled carbon nanotubes buckypapers based epoxy composites
Grantee:Felipe Carlos dos Reis
Support Opportunities: Scholarships in Brazil - Scientific Initiation