Carbon Nanotube-Aramid Fiber Enabled Dielectric Dispersion in Paper Composites for Ultrabroadband Lightweight Absorbers.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 42138478.
- Also identified by DOI 10.1021/acs.nanolett.6c01253.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Lightweight broadband microwave-absorbing materials (MAMs) are important for stealth and electromagnetic protection, but conventional designs usually rely on thick structures or high-load magnetic fillers, which often impose substantial weight penalties. Here, we introduce a dielectric-dispersion engineering strategy in aramid paper composites, enabled by single-walled carbon nanotube-coated aramid fibers (SAFs). In this system, both fiber length and conductivity are tunable, enabling regulation of the frequency-dependent permittivity through anisotropic depolarization effects. Multiscale simulations and experiments identify dielectric dispersion regulation as the key mechanism governing broadband absorption. SAFs with a length of 18 mm (about 1.28 × 10<sup>4</sup> S/m) enable broadband absorption spanning 2.2-18 GHz, whereas 9 mm SAFs deliver enhanced performance in the S-band (2.0-4.0 GHz). Guided by this principle, a gradient Jaumann absorber (18.5 mm, 40 kg/m<sup>3</sup>) achieves full-band absorption across 2.0-18 GHz. This work offers a conductive-fiber platform and insights for lightweight, high-performance MAMs.