Adsorption of Methanol on Aluminum Oxide: A Density Functional Study

Details Adsorption of Methanol on Aluminum Oxide: A Density Functional Study Adsorption of Methanol on Aluminum Oxide: A Density Functional Study

2003-07-02

arxiv.org/abs/cond-mat/0307039v1

Physics

Condensed Matter

Materials Science

11 pages, 3 figures, 1 table

Scientific paper

Theoretical calculations based on density functional theory have made significant contributions to our understanding of metal oxides, their surfaces, and the binding of molecules at these surfaces. In this paper we investigate the binding of methanol at the alpha-Al2O3(0001) surface using first-principles density functional theory. We calculate the molecular adsorption energy of methanol to be E^g_ads=1.03 eV/molecule. Taking the methanol-methanol interaction into account, we obtain the adsorption energy E_ads=1.01 eV/molecule. Our calculations indicate that methanol adsorbs chemically by donating electron charge from the methanol oxygen to the surface aluminum. We find that the surface atomic structure changes upon adsorption, most notably the spacing between the outermost Al and O layers changes from 0.11 Angstrom to 0.33 Angstrom.

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