Chemical bonding of termination species in 2D carbides investigated through valence band UPS/XPS of Ti₃C₂T _x MXene

Abstract

Chemical bonding of termination species in 2D carbides investigated through valence band UPS/XPS of Ti 3 C 2 T x MXene To cite this article: Lars-Åke Näslund et al 2021 2D Mater. 8 045026 View the article online for updates and enhancements.

XPS spectra curve fittings of Ti3C2Tx based on first principles thinking

“…The XPS spectra presented in this work are obtained from two types of Ti 3 C 2 T x samples: freestanding Ti 3 C 2 T x film and thin film Ti 3 C 2 T x on sapphire substrate. The preparations of both the freestanding Ti 3 C 2 T x film and the thin film Ti 3 C 2 T x on sapphire substrate are presented in previous works [13,19,24,25]. The Ti 3 AlC 2 , and TiC samples were both thin films on sapphire substrates prepared through direct current magnetron sputtering of elemental Ti, Al, and C targets.…”

“…For example, a freestanding Ti 3 C 2 T x film obtained from Ti 3 AlC 2 powders prepared in an alumina tube furnace is incorporated with small amounts of non-reacted TiC, oxidized components (TiO 2 and Al 2 O 3 ), and components from other side reactions. The fabrication of the freestanding Ti 3 C 2 T x film, which is a multi-step process that includes wet etching, cycles of washing, de-aerating, sonication, centrifugation, and filtering [24,25], might reduce the amount of impurities from the Ti 3 AlC 2 powders preparation but at the same time introduce new impurities in one or several of the Ti 3 C 2 T x processing steps, such as metal halides, alcohols, and graphite-like materials (Figs. 1 and 2).…”

Nanocrystalline TiO2/Ti3C2Tx MXene composites with a tunable work function prepared using atmospheric pressure oxygen plasma

“…A previous study has shown that the 0-4 eV region of the Ti 3 C 2 T x valence band comprises hybridized Ti-C orbitals. 54 Immediately after the MXene is exposed to oxygen plasma, the signal in this region weakens (inset of Fig. 5a), confirming the breaking of the Ti-C structures of the MXene.…”

Origin and Regulation of Self‐Discharge in MXene Supercapacitors

“…The feature near 7.2 eV in the VB‐XPS spectra originated from the interaction between Ti and O orbitals. [ 46 ] And its peak position shifts to higher binding energy for 2‐MX than p‐MX, implying a change in the O‐containing termination species, which is in line with the removal of ‐OH. Besides, the corresponding E VB , XPS of p‐MX and 2‐MX is measured to be 1.23 and 1.84 eV respectively.…”