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arXiv 2601.02431cond-mat.mtrl-sci
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水分子在TiO2和TiO2:Y表面的分子吸附

Molecular Adsorption of H2O on TiO2 and TiO2:Y Surfaces

S.U. Umarov Physical-Technical Institute of the National Academy of Science of Tajikistan(塔吉克斯坦国家科学院S.U.乌马尔物理技术研究所);Osimi Tajik Technical University(塔吉克技术大学奥西米分校);Joint Institute for Nuclear Research(苏联联合核子研究所);Dubna State University(杜布纳国立大学);Nanotechcenter LLC(纳米技术中心有限责任公司);Lusófona University, IDEGI(卢索丰大学IDEGI)

Dilshod Nematov, Khilmirzo Kholmurodov, Mirzoaziz Husenzoda, Andrey Lyubchyk, Amondulloi Burhonzoda

AI总结:

利用DFT+vdW理论研究水分子在TiO2和TiO2:Y表面的吸附行为,发现平行于Y轴吸附时带隙减小并产生新能级,最稳定结构为TiO2+H2O系统。

摘要:

在密度泛函理论框架内,结合非简谐vdW相互作用的理论计算中,研究了水分子与TiO2表面在不同构型下的吸附和相互作用过程。在原子/分子层面,研究了水分子与TiO2表面在不同取向下的相互作用。DFT+vdW框架内的计算结果表明,单个水分子在不同初始位置上的吸附能从-0.72到-0.84 eV不等,最稳定的吸附结构是水分子平行于Y轴吸附在TiO2表面形成的TiO2+H2O系统,因为在水分子平行于Y轴吸附时,钛氧化物的能带结构出现了一些有利的变化。一方面,带隙减小到2.59 eV,另一方面,在带隙中出现了一个能量贡献为0.17 eV的新能级,当水分子通过物理吸附与距离为2.12 Å的钛原子相互作用并占据垂直于表面的位置时。

英文摘要:

In this work, using theoretical calculations within the framework of the density functional theory, taking into account the dispersive VDW interaction, the processes of adsorption and interaction of a water molecule with a TiO2 surface in various configurations are investigated. At the atomic/molecular level, the interactions of a water molecule with a TiO2 surface have been studied for various orientations. The results of calculations within the framework of DFT+ VDW show that the adsorption energies of single water molecules in different initial positions on the substrate surface vary from-0.72 to-0.84 eV, and the most stable adsorbate structure is the TiO2+ H2O system upon adsorption of a molecule of water, parallel to the Y axis, because during the adsorption of H2O parallel to the Y axis, some favorable effects are observed in the band structure of titanium dioxide. On the one hand, the band gap decreases to 2.59 eV, and on the other hand, a new energy state appears in the band gap with an energy contribution of 0.17 eV, when water is physisorbed and interacts with a titanium atom at a distance of 2.12 Å and occupies a perpendicular position relative to the surface.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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