Functionalized MXenes have gained increasing interest in the fields of thermoelectric materials, hydrogen storage, and so forth. In this work, pressure-induced band modulation and optical properties of the TiCO monolayer are investigated by using density functional theory with the hybrid (HSE06) functional. The calculation reveals that TiCO MXenes under pressure are stable because of the positive . TiCO undergoes a semiconductor-to-metal phase transition at about 7 GPa. The metallization of TiCO mainly results from the Ti-d state. Research indicates that there exist strong interactions between Ti-d and C-p, and Ti-d and O-p states, which are further confirmed by the charge analysis. In addition, the absorption is enhanced in the visible region with increasing pressure. We also observed some new absorption peaks in the visible region.
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| http://dx.doi.org/10.1021/acsomega.0c02435 | DOI Listing |
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