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Preparation of Biomass-based Mesoporous Carbon with Higher Nitrogen-/Oxygen-chelating Adsorption for CuII Through Microwave Pre-Pyrolysis
Published on: February 12, 2019
Entropy driven carbon-coated multi-element alloy nanoparticles for enhanced microwave absorption.
Peng Wang1, Sibt Ul Hassan2, Daitao Kuang3
1Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Research Center of the Basic Discipline for Quantum Effects and Quantum Technologies, School of Physics and Electronics, Hunan Normal University, Changsha 410081, China.
This study engineered advanced carbon-coated multi-element alloy nanoparticles (MEA NPs) for superior electromagnetic (EM) wave absorption. The novel FeCoNiMn@C nanoparticles demonstrate exceptional microwave absorption and radar stealth capabilities.
Area of Science:
- Materials Science
- Nanotechnology
- Electromagnetics
Background:
- High-performance microwave absorbers are essential for managing electromagnetic (EM) pollution.
- Multi-element alloy nanoparticles (MEA NPs) offer tunable EM properties for absorption applications.
Purpose of the Study:
- To engineer carbon-coated MEA NPs (FeCoNiX@C) using an entropy-driven strategy.
- To systematically tune EM properties by incorporating Mn and Cr into FeCoNi cores.
- To enhance microwave attenuation and optimize impedance matching.
Main Methods:
- Synthesized carbon-coated MEA NPs (FeCoNiX@C, X = Mn, Cr, Mn0.5Cr, MnCr) via chemical vapor deposition.
- Employed an entropy-driven strategy to control nanoparticle composition.
- Investigated the impact of elemental complexity on dielectric, magnetic, and polarization relaxation properties.
Main Results:
- FeCoNiMn@C NPs achieved a minimum reflection loss of -57.3 dB and an effective absorption bandwidth of 5.20 GHz.
- Significant reduction in radar scattering (< -22 dB m²), indicating excellent radar stealth.
- Compositional engineering effectively modulated EM properties and improved impedance matching.
Conclusions:
- Entropy-driven compositional engineering is effective for tuning EM properties of carbon-coated MEA NPs.
- The developed FeCoNiMn@C NPs show promising potential as advanced microwave absorbers.
- This approach provides a pathway for rational design of materials for EM pollution mitigation and radar stealth.
