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Termination-Property Coupling via Reversible Oxygen Functionalization of MXenes
Journal article   Open access   Peer reviewed

Termination-Property Coupling via Reversible Oxygen Functionalization of MXenes

James L. Hart, Kanit Hantanasirisakul, Yury Gogotsi and Mitra L. Taheri
ACS Nanoscience Au, v 2(5), pp 433-439
19 Oct 2022
DOI: https://doi.org/10.1021/acsnanoscienceau.2c00024
url
https://doi.org/10.1021/acsnanoscienceau.2c00024View
Published, Version of Record (VoR)Open Access (License Unspecified),  Open

Abstract

electrical resistance measurements surface functionalization MXenes 2D materials electron energy loss spectroscopy oxidation state analysis
MXenes are a growing family of 2D transition-metal carbides and nitrides, which display excellent performance in myriad of applications. Theoretical calculations suggest that manipulation of the MXene surface termination (such as O or −F) could strongly alter their functional properties; however, experimental control of the MXene surface termination is still in the developmental stage. Here, we demonstrate that annealing MXenes in an Ar + O2 low-power plasma results in increased O functionalization with minimal formation of secondary phases. We apply this method to two MXenes, Ti2CT x and Mo2TiC2T x (T x represents the mixed surface termination), and show that in both cases, the increased O content increases the electrical resistance and decreases the surface transition-metal’s electron count. For Mo2TiC2O x , we show that the O content can be reversibly altered through successive vacuum and plasma annealing. This work provides an effective way to tune MXene surface functionalization, which may unlock exciting surface-dependent properties.

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