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Beyond Ti3C2Tx: MXenes for Electromagnetic Interference Shielding
journal contribution
posted on 2020-03-17, 19:16 authored by Meikang Han, Christopher Eugene Shuck, Roman Rakhmanov, David Parchment, Babak Anasori, Chong Min Koo, Gary Friedman, Yury GogotsiNew ultrathin and
multifunctional electromagnetic interference
(EMI) shielding materials are required for protecting electronics
against electromagnetic pollution in the fifth-generation networks
and Internet of Things era. Micrometer-thin Ti3C2Tx MXene films have shown the best EMI
shielding performance among synthetic materials so far. Yet, the effects
of elemental composition, layer structure, and transition-metal arrangement
on EMI shielding properties of MXenes have not been explored, despite
the fact that more than 30 different MXenes have been reported, and
many more are possible. Here, we report on a systematic study of EMI
shielding properties of 16 different MXenes, which cover single-metal
MXenes, ordered double-metal carbide MXenes, and random solid solution
MXenes of M and X elements. This is the largest set of MXene compositions
ever reported in a comparative study. Films with thicknesses ranging
from nanometers to micrometers were produced by spin-casting, spray-coating,
and vacuum-assisted filtration. All MXenes achieved effective EMI
shielding (>20 dB) in micrometer-thick films. The EMI shielding
effectiveness
of sprayed Ti3C2Tx film with a thickness of only ∼40 nm reaches 21 dB. Adjustable
EMI shielding properties were achieved in solid solution MXenes with
different ratios of elements. A transfer matrix model was shown to
fit EMI shielding data for highly conductive MXenes but could not
describe the behavior of materials with low conductivity. This work
shows that many members of the large MXene family can be used for
EMI shielding, contributing to designing ultrathin, flexible, and
multifunctional EMI shielding films benefiting from specific characteristics
of individual MXenes.
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double-metal carbide MXenesAdjustable EMI shielding propertiesEMI shielding dataMicrometer-thin Ti 3 C 2 T x MXene filmsTi 3 C 2 T x filmtransfer matrix modelElectromagnetic Interference Shielding New ultrathinsolution MXenesmultifunctional electromagnetic interferenceEMI shielding performancemultifunctional EMI shielding filmsEMI shielding effectivenessEMI shielding propertiesTi 3 C 2 T x
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