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Magnetized MXene Microspheres with Multiscale Magnetic Coupling and Enhanced Polarized Interfaces for Distinct Microwave Absorption via a Spray-Drying Method
journal contribution
posted on 2020-04-01, 12:56 authored by Xiao Li, Mao Zhang, Wenbin You, Ke Pei, Qingwen Zeng, Qing Han, Yuesheng Li, Hui Cao, Xianhu Liu, Renchao CheAs
a typical 2D (two dimensional) material, Ti3C2Tx, has been used as a promising microwave
absorber (MA) because of its massive interface architecture, abundant
natural defects, and chemical surface functional groups. However,
its single dielectric-type loss and excessive high conductivity seriously
restrict the further enhancement of MA performance. Herein, we first
describe a simple spray-drying routine to reshape the 2D MXene into
a confined and magnetized microsphere with tightly embedded Fe3O4 nanospheres (designated as M/F), contributing
to the enhanced specific interfaces and strong dielectric polarization.
These Fe3O4 magnetic units are highly dispersed
into the dielectric Mxene framework, leading to the optimized impedance
balance and electromagnetic coordination capability. This composite
way effectively exceeds the conventionally physical mixing, simple
loading, and local phase separation method. Meanwhile, strong magnetic
loss capability with significantly improved magnetic flux line density
is achieved from microscale MXene and nanoscale Fe3O4, confirming our 3D multiscale magnetic coupling network.
Accordingly, the M/F composites hold distinct microwave absorption
property with the strong reflection loss (−50.6 dB) and effective
absorption bandwidth (4.67 GHz) at the thickness as thin as only 2
mm. Our encouraging strategy provides important designable implications
for MXene-based functional materials and high-performance absorbers.
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Distinct Microwave AbsorptionMA performancemicrowave absorption propertymicrowave absorberdesignable implicationsmaterialinterface architecture2 Dnanoscale Fe 3 O 4dielectric Mxene frameworkelectromagnetic coordination capability2 mmmicroscale MXeneEnhanced Polarized InterfacesMagnetized MXene MicrospheresSpray-Drying Methodchemical surface3 D multiscaleloss capabilityFe 3 O 4flux line densitydielectric polarization2 D MXeneFe 3 O 4 nanospheresoptimized impedance balancephase separation methoddielectric-type lossTi 3 C 2 T x
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