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arXiv 1303.3774cond-mat.mtrl-sciphysics.chem-ph
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甲醇在石墨烯上的吸附

Methanol adsorption on graphene

Elsebeth Schroder

摘要:

从第一性原理密度泛函计算确定了甲醇在石墨烯上的吸附能和取向。我们采用经过良好测试的vdw-DF方法,该方法无缝地包括色散相互作用与所有更近距离的相互作用,这些相互作用导致共价键和氢键等键。在不同覆盖率下,研究了单个甲醇分子和小团簇在石墨烯上的吸附。发现在簇中或在高覆盖率(小于单层)下的吸附是优选的,其中甲醇C-O轴近似平行于石墨烯的平面。与vdW-DF计算的吸附能相比,与以前的DFT-D和MP2为基础的计算单甲醇吸附在薄片的石墨烯(多环芳烃)。对于高覆盖吸附能,我们也发现相当好的协议与以前的解吸测量。

英文摘要:

The adsorption energies and orientation of methanol on graphene are determined from first-principles density functional calculations. We employ the well-tested vdW-DF method that seamlessly includes dispersion interactions with all of the more close-ranged interactions that result in bonds like the covalent and hydrogen bonds. The adsorption of a single methanol molecule and small methanol clusters on graphene are studied at various coverages. Adsorption in clusters or at high coverages (less than a monolayer) is found to be preferable, with the methanol C-O axis approximately parallel to the plane of graphene. The adsorption energies calculated with vdW-DF are compared with previous DFT-D and MP2-based calculations for single methanol adsorption on flakes of graphene (polycyclic aromatic hydrocarbons). For the high coverage adsorption energies we also find reasonably good agreement with previous desorption measurements.

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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