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. 2022 Apr 27;22(8):3356-3363.
doi: 10.1021/acs.nanolett.2c00614. Epub 2022 Apr 6.

Friction of Ti3C2Tx MXenes

Peter Serles  1 , Mahdi Hamidinejad  1   2   3 , Pedro Guerra Demingos  4 , Li Ma  1 , Nima Barri  1 , Hayden Taylor  3 , Chandra Veer Singh  4 , Chul B Park  1 , Tobin Filleter  1
Affiliations

Friction of Ti3C2Tx MXenes

Peter Serles et al. Nano Lett. .

Abstract

2D materials are well-known for their low-friction behavior by modifying the interfacial forces at atomic surfaces. Of the wide range of 2D materials, MXenes represent an emerging material class but their lubricating behavior has been scarcely investigated. Herein, the friction mechanisms of 2D Ti3C2Tx MXenes are demonstrated which are attributed to their surface terminations. We find that Ti3C2Tx MXenes do not exhibit the well-known frictional layer dependence of other 2D materials. Instead, the nanoscale lubricity of 2D MXenes is governed by the termination species resulting from synthesis. Annealing the MXenes demonstrate a 7% reduction in OH termination which translates to a 16-57% reduction of friction in agreement with DFT calculations. Finally, the stability of MXene flakes is demonstrated upon isolation from their aqueous environment. This work indicates that MXenes can provide sustainable lubricity at any thickness which makes them uniquely positioned among 2D material lubricants.

Keywords: 2D material; MXene; Ti3C2Tx; friction; interlayer; lubrication; terminations.

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