Dandelion-like carbon nanotube assembly embedded with closely separated Co nanoparticles for high-performance microwave absorption materials
- 21 April 2020
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Nanoscale
- Vol. 12 (18), 10149-10157
- https://doi.org/10.1039/d0nr01447h
Abstract
Enhancing the magnetic loss capacity by microstructure design remains a considerable challenge in the microwave absorption field. Herein, a high-performance microwave absorbent is developed by dispersing a considerable amount of magnetic nanoparticles within the dandelion-like carbon nanotube assembly. A controllable fabrication method is further exploited to adjust the distribution feature of these embedded nanomagnets. In such a hierarchical composite, parts of the interaction network among the coupled closely spaced nanomagnets can be frequently broken and rebuilt to intensively dissipate the microwave energy, which is confirmed by electron holography and micromagnetic simulation for the first time. By virtue of this dynamic magnetic coupling network mechanism, the hierarchical C/Co composite acquires the first-rate microwave absorption performance. The maximum reflection loss value reaches as much as −52.9 dB (absorbance >0.99999) and the effective absorption bandwidth (absorbance >0.9) occupies the entire X band. It is believed that the above insightful mechanism provides a new opportunity to lower the density of the magnet-based microwave absorbent as much as possible. Besides, the unique method for dispersing magnetic nanoparticles also broadens the pathway to assemble the hierarchical architecture.Keywords
Funding Information
- Ministry of Science and Technology of the People's Republic of China (2018YFA0209102)
- National Natural Science Foundation of China (11727807, 51725101, 51672050, 61790581)
This publication has 56 references indexed in Scilit:
- Electromagnetic Property and Tunable Microwave Absorption of 3D Nets from Nickel Chains at Elevated TemperatureACS Applied Materials & Interfaces, 2016
- From Bimetallic Metal‐Organic Framework to Porous Carbon: High Surface Area and Multicomponent Active Dopants for Excellent ElectrocatalysisAdvanced Materials, 2015
- Insights into Size-Dominant Magnetic Microwave Absorption Properties of CoNi Microflowers via Off-Axis Electron HolographyACS Applied Materials & Interfaces, 2015
- Preparation of rugby-shaped CoFe2O4particles and their microwave absorbing propertiesJournal of Materials Chemistry A, 2014
- Synthesis of hierarchical dendritic micro-nano structure CoxFe1−x alloy with tunable electromagnetic absorption performanceJournal of Materials Chemistry A, 2013
- Hierarchical Dendrite-Like Magnetic Materials of Fe3O4, γ-Fe2O3, and Fe with High Performance of Microwave AbsorptionChemistry of Materials, 2011
- Template free synthesis and electromagnetic wave absorption properties of monodispersed hollow magnetite nano-spheresJournal of Materials Chemistry, 2011
- Constructing Hierarchical Spheres from Large Ultrathin Anatase TiO2 Nanosheets with Nearly 100% Exposed (001) Facets for Fast Reversible Lithium StorageJournal of the American Chemical Society, 2010
- High-performance lithium-ion anodes using a hierarchical bottom-up approachNature Materials, 2010
- Nanostructured Materials for Electrochemical Energy Conversion and Storage DevicesAdvanced Materials, 2008