Beyond Ti3C2Tx: MXenes for Electromagnetic Interference Shielding.

By Meikang Han, C. Shuck, R. Rakhmanov, David Parchment, B. Anasori, C. Koo, Gary Friedman, Yury Gogotsi. ACS Nano, 2020

689 citations recorded by the source corpus.

New 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 benefitting from specific characteristics of individual MXenes.

Subfields: Aerospace Engineering, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/98556b9b2de8d22bf3127f0c6a564eed5aff3444

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In Aerospace Engineering

Yury Gogotsi

In Electronic, Optical and Magnetic Materials

In Materials Chemistry

Citations in the corpus

Modified MAX Phase Synthesis for Environmentally Stable and Highly Conductive Ti3C2 MXene. (2020, background): “We anticipate that this new methodology will be used as a guide to improve the oxidation stability and electronic conductivity of a large variety of carbide MXenes.”