Chemical bonding in carbide MXene nanosheets

Abstract

The chemical bonding in the carbide core and the surface chemistry in a new group of transition-metal carbides Tin+1Cn-Tx (n=1,2) called MXenes have been investigated by surface-sensitive valence band X-ray photoelectron spectroscopy. Changes in band structures of stacked nano sheets of different thicknesses are analyzed in connection to known hybridization regions of TiC and TiO2 that affect elastic and transport properties. By employing high excitation energy, the photoelectron cross-section for the C 2s - Ti 3d hybridization region at the bottom of the valence band is enhanced. As shown in this work, the O 2p and F 2p bands are shown to strongly depend both on the bond lengths to the surface groups and the adsorption sites. The effect of surface oxidation and Ar+ sputtering on the electronic structure is also discussed.

11 pages, 5 figures

References in corpus (2)

• Electric Field Effect in Atomically Thin Carbon Films
• Chemical bonding and electronic-structure in MAX phases as viewed by X-ray spectroscopy and density functional theory

Cited by in corpus (4)

• Chemical Bonding of Termination Species in 2D Carbides Investigated through Valence Band UPS/XPS of Ti3C2Tx MXene
• Local chemical bonding and structural properties in Ti3AlC2 MAX phase and Ti3C2Tx MXene probed by Ti 1s X-ray absorption spectroscopy
• Fermiology and Band Structure of Oxygen-Terminated Ti3C2Tx MXene
• Interaction and kinetics of H2, CO2, and H2O on Ti3C2Tx MXene probed by X-ray photoelectron spectroscopy