TY - JOUR
T1 - Enhancing Electromagnetic Interference Shielding Effectiveness of Polymer Nanocomposites by Modifying Subsurface Carbon Nanotube Distribution
AU - Castañeda-Uribe, Octavio Alejandro
AU - Avila, Alba
N1 - Funding Information:
The authors gratefully acknowledge financial support from the Doctoral Scholarship Program # 528 of COLCIENCIAS, funding from the Office of Naval Research through the grant N62909‐16‐1‐2151, and Department of Electrical and Electronic Engineering, Universidad de los Andes. The authors also acknowledge the access to the clean‐room laboratory, Centro de Microscopía μ‐core, and the EM characterization (VNA) facilities of Universidad de los Andes.
Publisher Copyright:
© 2020 Wiley-VCH GmbH
PY - 2021/1
Y1 - 2021/1
N2 - Enhancing electromagnetic interference (EMI) shielding effectiveness (SE) of polymer nanocomposites (PNCs) relies on modification of carbon nanotube (CNT) distributions achieved by controlling fabrication parameters. However, establishing correlations between fabrication parameters, CNT distributions, and SE properties is a challenging task due to the restrictions on the traditionally implemented CNT network detection techniques and qualitative CNT distribution descriptors. Herein an SE enhancing methodology for single-walled carbon nanotubes/polyimide (SWCNT/PI) nanocomposite films in which AC sinusoidal voltages (5, 10, and 15 V at 10 Hz) are applied during processing to control CNT distribution is presented. The prepared nanocomposite samples are characterized using scattering-parameter measurements for SE estimation and second-harmonic electrostatic force microscopy (2ωe-EFM) for subsurface CNT network detection. The detected CNT networks are described by implementing the uniform-distancing (CNTD), agglomeration (CNTA), and shielding (CNTS) quantitative CNT descriptors. The results show enhancement on the nanocomposite SE values with the increment on the CNTS descriptor, which increases with lower applied voltages during processing. The SWCNT/PI nanocomposite studied herein exhibits a predominant absorption SE mechanism, which makes it a candidate for potential EMI absorber material applications. The proposed methodology represents an alternative for the quantitative assessment of correlations between PNC properties, CNT distributions, and fabrication parameters.
AB - Enhancing electromagnetic interference (EMI) shielding effectiveness (SE) of polymer nanocomposites (PNCs) relies on modification of carbon nanotube (CNT) distributions achieved by controlling fabrication parameters. However, establishing correlations between fabrication parameters, CNT distributions, and SE properties is a challenging task due to the restrictions on the traditionally implemented CNT network detection techniques and qualitative CNT distribution descriptors. Herein an SE enhancing methodology for single-walled carbon nanotubes/polyimide (SWCNT/PI) nanocomposite films in which AC sinusoidal voltages (5, 10, and 15 V at 10 Hz) are applied during processing to control CNT distribution is presented. The prepared nanocomposite samples are characterized using scattering-parameter measurements for SE estimation and second-harmonic electrostatic force microscopy (2ωe-EFM) for subsurface CNT network detection. The detected CNT networks are described by implementing the uniform-distancing (CNTD), agglomeration (CNTA), and shielding (CNTS) quantitative CNT descriptors. The results show enhancement on the nanocomposite SE values with the increment on the CNTS descriptor, which increases with lower applied voltages during processing. The SWCNT/PI nanocomposite studied herein exhibits a predominant absorption SE mechanism, which makes it a candidate for potential EMI absorber material applications. The proposed methodology represents an alternative for the quantitative assessment of correlations between PNC properties, CNT distributions, and fabrication parameters.
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U2 - 10.1002/adem.202000707
DO - 10.1002/adem.202000707
M3 - Article
AN - SCOPUS:85090963332
SN - 1438-1656
VL - 23
JO - Advanced Engineering Materials
JF - Advanced Engineering Materials
IS - 1
M1 - 2000707
ER -
