Nanomechanical Properties of Ti₃C₂ Mxene

Abstract

MXene is a new type of two-dimensional (2D) material that finds wide applications; however, its adhesion and tribological properties have not yet been fully revealed. Here, the chemical structure of MXene was revealed by X-ray diffraction, and the adhesion and friction behaviors of MXene were studied with atomic force microscopy (AFM) Nanoman technology. It was found in AFM tests that MXene exhibited enhanced adhesion and friction at higher pressure but exhibited reduced adhesion and friction at elevated temperature, while the sliding speed and delay time of the AFM probe have negligible effects on the friction. X-ray photoelectron spectroscopy was used to reveal the change in the chemical structure of MXene at different temperatures. We found increased oxidation, and replacement of C by O atoms occurred on MXene at higher temperatures, which has a profound impact on the adhesion and friction between MXene and the probe tip. This discovery lays the foundation for understanding the adhesion mechanism and the dynamic adhesion behavior in friction of MXene, rendering MXene a much broader application prospect.

Mechanotribological Aspects of MXene‐Reinforced Nanocomposites

“…It has been revealed that MXene sheets have different properties under diverse conditions. Shown in Figure 6, Guo et al [117] studied the nanomechanical behavior of Ti 3 C 2 sheets and observed that the adhesion and friction values are enhanced at higher pressures while reduced at elevated temperatures; X-ray photoelectron spectroscopy (XPS) showed that the chemical structure of the MXene flakes varies at different temperatures due to the increased oxidation rate at elaborated temperatures dominating the tribological properties.…”

“…TiC or Ti 3 C 2 are the examples of those hard ceramics with extremely high antiwear property but their poor ductility Adopted with permission. [117] Copyright 2019, American Chemical Society. www.advancedsciencenews.com…”

A comprehensive review of MXenes as catalyst supports for the oxygen reduction reaction in fuel cells

“…151 Many studies involving both theoretical and experimental techniques have been conducted to understand and predict the properties of MXenes. 73,[152][153][154][155] In terms of mechanical strength, O functionalized MXenes are better than F and OH functionalized MXenes. 156 Through a theoretical study, Zha et al found that O functionalized MXenes show a relatively smaller lattice parameter than F and OH functionalized MXenes and possess higher mechanical strength.…”

Synergistic Catalytic Acceleration of MXene/MWCNTs as Decorating Materials for Ultrasensitive Detection of Morphine

“…The peaks at 459.6, 461.2, and 463.1 eV correspond to the 2p1/2 peaks of Ti−C, Ti−X, Ti−O, respectively. The existence of Ti−O is attributed to the slight oxidation on the surface of Ti 3 C 2 T X [43], Ti−X is the functional group C−Ti−(OH) 2 , C−Ti−O, Ti−F on the surface of Ti 3 C 2 T X [44]. Both the FTIR and XPS indicate the existence of the surface functional groups.…”