Issue

Vol. 14 (2022)

Highly Flexible Fabrics/Epoxy Composites with Hybrid Carbon Nanofillers for Absorption-Dominated Electromagnetic Interference Shielding

https://doi.org/10.1007/s40820-022-00926-1
Jong‑Hoon Lee
Department of Chemistry, Inha University, 100 Inharo, Incheon 22212, Korea
Yoon‑Sub Kim
Department of Chemistry, Inha University, 100 Inharo, Incheon 22212, Korea
Hea‑Jin Ru
Department of Chemistry, Inha University, 100 Inharo, Incheon 22212, Korea
Seul‑Yi Lee
Department of Chemistry, Inha University, 100 Inharo, Incheon 22212, Korea
Soo‑Jin Park
Department of Chemistry, Inha University, 100 Inharo, Incheon 22212, Korea

Corresponding Author: Soo‑Jin Park

sjpark@inha.ac.kr

Nano-Micro Letters, Vol. 14 (2022), Article Number: 188

Abstract

Epoxy-based nanocomposites can be ideal electromagnetic interference (EMI)-shielding materials owing to their lightness, chemical inertness, and mechanical durability. However, poor conductivity and brittleness of the epoxy resin are challenges for fast-growing portable and flexible EMI-shielding applications, such as smart wristband, medical cloth, aerospace, and military equipment. In this study, we explored hybrid nanofillers of single-walled carbon nanotubes (SWCNT)/reduced graphene oxide (rGO) as conductive inks and polyester fabrics (PFs) as a substrate for flexible EMI-shielding composites. The highest electrical conductivity and fracture toughness of the SWCNT/rGO/PF/epoxy composites were 30.2 S m−1 and 38.5 MPa m1/2, which are ~ 270 and 65% enhancement over those of the composites without SWCNTs, respectively. Excellent mechanical durability was demonstrated by stable electrical conductivity retention during 1000 cycles of bending test. An EMI-shielding effectiveness of ~ 41 dB in the X-band frequency of 8.2–12.4 GHz with a thickness of 0.6 mm was obtained with an EM absorption-dominant behavior over a 0.7 absorption coefficient. These results are attributed to the hierarchical architecture of the macroscale PF skeleton and nanoscale SWCNT/rGO networks, leading to superior EMI-shielding performance. We believe that this approach provides highly flexible and robust EMI-shielding composites for next-generation wearable electronic devices.


Highlights:


1 Highly flexible carbon ink-loaded polyester fabric/epoxy composites with outstanding mechanical durability and absorption-dominant EMI-shielding characteristics are fabricated.
2 The fracture toughness is ~ 38.5 MPa m1/2 and electrical conductivity is maintained after 1000 bending cycles.
3 A superior electromagnetic interference SE/t of ~ 66.8 dB mm–1 was observed in the X-band frequency with over 0.7 absorption coefficient, related to the hierarchical structures composed of macro-scaled voids from the polyester nonwoven fabric skeleton and nano-scaled networks from SWCNTs/rGO.

Keywords

Conductive polymer composites Fracture toughness Flexible composites Absorption-dominated electromagnetic interference shielding
Lee, Jong‑Hoon, Yoon‑Sub Kim, Hea‑Jin Ru, Seul‑Yi Lee, and Soo‑Jin Park. 2022. “Highly Flexible Fabrics/Epoxy Composites With Hybrid Carbon Nanofillers for Absorption-Dominated Electromagnetic Interference Shielding”. Nano-Micro Letters 14 (September):188. https://doi.org/10.1007/s40820-022-00926-1.
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