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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/217971
Effect of the Ti2CTx (Tx = O, OH, and H) Functionalization on the Formation of (TiO2)5/Ti2CTx Composites
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First-principles density functional theory calculations are carried out on the (TiO2)5 cluster supported on the Ti2CTx(0001) surface with different chemical terminations, i.e., −H, −O, and −OH, to study the interaction and understand the Ti2CTx functionalization effect on the formation of (TiO2)5/Ti2CTx composites. Results show an exothermic interaction for all cases, whose strength is driven by the surface termination, promoting weaker bonds when the MXene is functionalized with H atoms. For Ti2CH2 and Ti2C(OH)2 MXenes, the interaction is accompanied by a charge transfer towards the titania cluster. All adsorptions are accompanied by a significant structural deformation of the titania nanocluster. The analysis of the density of states of (TiO2)5/Ti2CH2 and (TiO2)5/Ti2C(OH)2 composites shows a clear almost metallic character with titania-related states close to the Fermi level. However, for (TiO2)5/Ti2CO2, the band positions are similar to those of a Type-I heterojunction. Overall, the MXene surface termination influence on the TiO2/MXene interaction is unveiled, providing more stable composite formations when the MXene surface is functionalized with −H and −OH groups, where the adsorption process is accompanied by significant charge transfer.
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GARCÍA-ROMERAL, Néstor, MORALES GARCÍA, Ángel, VIÑES SOLANA, Francesc. Effect of the Ti2CTx (Tx = O, OH, and H) Functionalization on the Formation of (TiO2)5/Ti2CTx Composites. _Journal of Physical Chemistry C_. 2025. Vol. 129, núm. 1, pàgs. 826-836. [consulta: 29 de gener de 2026]. ISSN: 1932-7447. [Disponible a: https://hdl.handle.net/2445/217971]