3D Porous Graphene with Atomic Fe Coordinated by Pyrrole‐N Dopants for Efficient Electromagnetic Wave Absorption with Low Filler Loading and Thin Thickness

Small, Journal Year: 2025, Volume and Issue: unknown

Published: April 30, 2025

Abstract Achieving effective electromagnetic wave (EMW) absorption performance with less than 2 mm remains a significant challenge in developing EMW materials. Herein, Fe atoms embedded into NH 3 ‐treated 3D porous graphene (3DPG‐NH ‐Fe) are synthesized via simple method of ion impregnation for efficient absorption. The process enables the formation specific pyrrole‐N dopants 3DPG, which provide anchoring sites complexing to construct FeN x moieties. Compared pristine 3DPG‐NH ‐Fe exhibits remarkable characteristics, achieving minimum reflection loss (RL) −56.35 dB and an bandwidth (EAB) 4.45 GHz at low filler loading wt.% thin thickness 1.4 mm, exceeding most reported graphene‐based outstanding is critically attributed incorporation coordinated by strong orbital hybridization N‐p y Fe‐3d x2‐y2 graphene, not only produces additional dipoles but also generates high spin atomic magnetic moment, thus enhancing both dielectric EMW. This work demonstrates new route modulating characteristics achieve

Language: Английский

Exploring the energy dissipation mechanism and toughness quantitative model for high-toughness recycled concrete subjected to dynamic impact loading

Journal of Building Engineering, Journal Year: 2025, Volume and Issue: unknown, P. 112809 - 112809

Published: May 1, 2025

Language: Английский