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Control of MXenes' Electronic Properties through Termination and Intercalation
Book chapter   Open access

Control of MXenes' Electronic Properties through Termination and Intercalation

James L. Hart, Kanit Hantanasirisakul, Andrew C. Lang, Babak Anasori, David Pinto, Yevheniy Pivak, J. Tijn van Omme, Steven J. May, Yury Gogotsi and Mitra L. Taheri
MXenes, pp 227-256
2023
DOI: https://doi.org/10.1201/9781003306511-12
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https://doi.org/10.1201/9781003306511-12View
Published, Version of Record (VoR)CC BY V4.0,  Open

Abstract

MXenes are an emerging family of highly-conductive 2D materials which have demonstrated state-of-the-art performance in electromagnetic interference shielding, chemical sensing, and energy storage. To further improve performance, there is a need to increase MXenes' electronic conductivity. Tailoring the MXene surface chemistry could achieve this goal, as density functional theory predicts that surface terminations strongly influence MXenes' Fermi level density of states and thereby MXenes' electronic conductivity. Here, we directly correlate MXene surface de-functionalization with increased electronic conductivity through in situ vacuum annealing, electrical biasing, and spectroscopic analysis within the transmission electron microscope. Furthermore, we show that intercalation can induce transitions between metallic and semiconductor-like transport (transitions from a positive to negative temperature-dependence of resistance) through inter-flake effects. These findings lay the groundwork for intercalation- and termination-engineered MXenes, which promise improved electronic conductivity and could lead to the realization of semiconducting, magnetic, and topologically insulating MXenes.

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