Key Takeaways & Executive Findings
- •• • CNT fibers achieve a specific tensile strength of 25.3 cN/dtex and electrical conductivity of 3634.2 ± 114.0 S/cm, enabling robust, conductive fabrics that outperform many metallic alternatives on a weight-adjusted basis. • • Single-layer CNT fabric provides 66.8 dB EMI SE, while multilayer stacks reach 111 dB, exceeding the 90.49 dB reported for MXene-incorporated sponges and satisfying stringent aerospace and defense shielding requirements (typically >60 dB). • • The fabric maintains an ultralow density of 0.2 g/cm³, reducing the shielding layer mass in coaxial cables by 32.1% compared to copper, directly addressing weight-critical applications in aerospace and portable electronics. • • Durability tests confirm resistance to repeated bending and washing, with no reported degradation in shielding performance, indicating suitability for wearable and machine-washable electronics where mechanical robustness is essential.
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Abstract
Electromagnetic interference (EMI) shielding materials are critical for protecting sensitive electronic devices from external interference. Traditional metallic shields suffer from high density, rigidity, and poor adaptability to complex circuitry. This study presents a lightweight, flexible carbon nanotube (CNT) fabric with superior EMI shielding performance, fabricated through scalable CNT fiber preparation and knitting of CNT yarns. The CNT fibers exhibit a specific tensile strength of 25.3 cN/dtex and an electrical conductivity of 3634.2 ± 114.0 S/cm. The resulting CNT fabric achieves an EMI shielding effectiveness (SE) of 66.8 dB for a single layer and 111 dB for multiple layers, while maintaining an ultralow density of 0.2 g/cm³. The fabric withstands repeated bending and washing without significant degradation. When applied as the EMI shielding layer in coaxial cables, the CNT fabric delivers signal transmission performance comparable to copper while reducing the shielding layer mass by 32.1%. These combined properties position CNT fabric as a viable alternative to conventional metal-based shielding materials, with potential applications in aerospace, electronics, and wearable technologies.
1. Introduction
Metallic EMI shielding materials, while effective due to high electrical conductivity and impedance mismatch with air, suffer from high density, brittleness, low flexibility, and susceptibility to corrosion. These limitations impede their integration into lightweight, miniaturized electronic devices and complex circuitry. Nanomaterials such as carbon nanotubes (CNTs), graphene, and MXenes offer high conductivity, corrosion resistance, and ultralight weight, but existing fabrication methods for nano-based EMI shielding fabrics—dispersion, dip-coating, vacuum filtration, and spraying—often yield inconsistent coatings, poor durability, and limited scalability.
This study addresses these bottlenecks by developing a scalable knitting process for CNT yarns into fabrics. The resulting CNT fabric combines high electrical conductivity (3634.2 S/cm), exceptional EMI shielding (66.8 dB single layer, 111 dB multilayer), and ultralow density (0.2 g/cm³). The fabric withstands repeated bending and washing, and when used as a coaxial cable shielding layer, it matches copper's signal transmission while reducing mass by 32.1%. This protocol provides a commercially viable route to lightweight, durable EMI shields for aerospace, electronics, and wearable technologies.
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Hongyu Jiang, Hongji Sun, Songlin Zhang, Peining Chen, Huisheng Peng (2025). Lightweight and High-Performance Carbon Nanotube Fabrics for Electromagnetic Interference Shielding. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3319-4
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Frequently Asked Questions
What is the electrical conductivity and specific tensile strength of the CNT fibers, and how do these compare to conventional metal-based shielding materials?
The CNT fibers exhibit an electrical conductivity of 3634.2 ± 114.0 S/cm and a specific tensile strength of 25.3 cN/dtex. While bulk copper has higher absolute conductivity (~5.96 × 10^5 S/cm), its density is 8.96 g/cm³, resulting in a specific conductivity far lower than that of the CNT fabric (0.2 g/cm³). The CNT fabric's combination of high conductivity and ultralow density enables effective EMI shielding with a 32.1% mass reduction in coaxial cable shielding layers.
How does the EMI shielding effectiveness of the CNT fabric compare to state-of-the-art MXene-based shields, and what is the mechanism?
The CNT fabric achieves 66.8 dB for a single layer and 111 dB for multiple layers, surpassing the 90.49 dB reported for MXene-incorporated melamine/polyurethane sponges. The shielding mechanism primarily involves reflection due to impedance mismatch and absorption via dielectric losses within the CNT network. The knitted structure provides a continuous conductive pathway, enhancing multiple internal reflections and absorption.
What is the durability of the CNT fabric under repeated bending and washing, and what are the failure mechanisms?
The CNT fabric remains stable and durable under repeated bending and washing, with no significant degradation in EMI shielding performance reported. The knitted architecture allows for mechanical flexibility, distributing stress across yarn intersections. Failure mechanisms under extreme conditions may include fiber breakage or yarn pull-out, but the fabric's robustness suggests suitability for wearable electronics and machine-washable textiles.
What are the scalability and cost considerations for industrial production of CNT fabrics?
The fabrication process involves scalable preparation of CNT fibers and knitting of CNT yarns, which is amenable to continuous manufacturing. While CNT production costs remain higher than copper, the 32.1% mass reduction and elimination of corrosion protection (required for metals) can offset material costs in weight-sensitive applications. Industrial scalability is further supported by the use of established textile knitting techniques.
How does the CNT fabric perform as a coaxial cable shielding layer compared to copper in terms of signal transmission?
When applied as the EMI shielding layer in coaxial cables, the CNT fabric delivers comparable signal transmission performance to copper while reducing the shielding layer mass by 32.1%. This indicates that the CNT fabric does not compromise electrical performance and offers a lightweight alternative for RF cables in aerospace and portable electronics.
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