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First-principles study of the adsorption of methanol at the alpha-Al2O3(0001) surface

Øyvind Borck (Institutionen för teknisk fysik, Material- och ytteori ; Extern) ; Elsebeth Schröder (Institutionen för teknisk fysik, Material- och ytteori)
J. Phys.: Condens. Matter Vol. 18 (2006), p. 1-12.
[Artikel, refereegranskad vetenskaplig]

We present density functional theory calculations of methanol molecular adsorption at the (0001) surface of alpha-Al2O3, for methanol coverages of 1/4 to 1 monolayer (ML). Adsorption energies, adsorption-induced restructuring of the surface, and induced changes to the electronic structure are calculated. We find that methanol bonds with its O atom to Al atoms at the alpha-Al2O3(0001) surface with an adsorption energy of 1.23 eV at coverage 1/4 ML, decreasing with coverage to 1.03 eV at 1 ML coverage. From calculations of the relaxed adsorption geometry and the angular dependence of the total energy, we predict an orientation of the adsorbed methanol molecule that has the molecular COH plane tilted away from the surface normal. The adsorption of methanol significantly restructures alpha-Al2O3(0001), especially for the outermost Al layer. Upon adsorption a small charge transfer from the molecule to the substrate takes place.



Denna post skapades 2006-08-28. Senast ändrad 2015-12-17.
CPL Pubid: 10025

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Material- och ytteori (1900-2015)

Ämnesområden

Den kondenserade materiens fysik

Chalmers infrastruktur