Scalable fabrication of lightweight carbon nanotube aerogel composites for full X-band electromagnetic wave absorption

Nguyen, Luon Tan; Goh, Chong Jin; Bai, Tianliang; Ong, Ren Hong; Goh, Xue Yang; Duong, Hai M.

doi:10.1016/j.carbon.2024.118811

Cited by 5 publications

(1 citation statement)

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“…Microwave absorbing materials (MAM) can be categorized into three groups based on distinct absorption mechanisms: materials with dielectric loss, magnetic loss, and composite loss [ 7 ]. Dielectric loss materials primarily encompass carbon-based materials [ 8 – 10 ], MXene [ 11 ], non-magnetic metal compounds [ 12 ], and nonmetallic compounds [ 13 ]. Notably, carbon-based materials have garnered significant attention owing to their distinctive properties, including lightweight characteristics, suitability for practical engineering applications, and favorable electrical properties.…”

Section: Introductionmentioning

confidence: 99%

Designing Symmetric Gradient Honeycomb Structures with Carbon-Coated Iron-Based Composites for High-Efficiency Microwave Absorption

Zhang,

Yang,

Xin

et al. 2024

Nano-Micro Lett.

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The impedance matching of absorbers is a vital factor affecting their microwave absorption (MA) properties. In this work, we controllably synthesized Material of Institute Lavoisier 88C (MIL-88C) with varying aspect ratios (AR) as a precursor by regulating oil bath conditions, followed by one-step thermal decomposition to obtain carbon-coated iron-based composites. Modifying the precursor MIL-88C (Fe) preparation conditions, such as the molar ratio between metal ions and organic ligands (M/O), oil bath temperature, and oil bath time, influenced the phases, graphitization degree, and AR of the derivatives, enabling low filler loading, achieving well-matched impedance, and ensuring outstanding MA properties. The MOF-derivatives 2 (MD2)/polyvinylidene Difluoride (PVDF), MD3/PVDF, and MD4/PVDF absorbers all exhibited excellent MA properties with optimal filler loadings below 20 wt% and as low as 5 wt%. The MD2/PVDF (5 wt%) achieved a maximum effective absorption bandwidth (EAB) of 5.52 GHz (1.90 mm). The MD3/PVDF (10 wt%) possessed a minimum reflection loss (RLmin) value of − 67.4 at 12.56 GHz (2.13 mm). A symmetric gradient honeycomb structure (SGHS) was constructed utilizing the high-frequency structure simulator (HFSS) to further extend the EAB, achieving an EAB of 14.6 GHz and a RLmin of − 59.0 dB. This research offers a viable inspiration to creating structures or materials with high-efficiency MA properties.

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