Author/Authors :
Thomas، نويسنده , , A.G. and Flavell، نويسنده , , W.R. and Chatwin، نويسنده , , C.P. and Kumarasinghe، نويسنده , , A.R. and Rayner، نويسنده , , S.M. and Kirkham، نويسنده , , P.F. and Tsoutsou، نويسنده , , D. and Johal، نويسنده , , T.K. and Patel، نويسنده , , S.، نويسنده ,
Abstract :
The adsorption of the aromatic amino acid, phenylalanine on a TiO2 rutile (1 1 0) single crystal surface has been investigated with photoemission and NEXAFS (near edge X-ray absorption fine structure) spectroscopy. The results indicate initial adsorption via the carboxylate group in a bidentate configuration with the phenyl ring oriented at approximately 25° to the surface normal. The amino group remains as NH2. Subsequent layers of phenylalanine appear to adsorb as neutral molecules with H-bonding between NH2 and CO groups.
Keywords :
Titanium dioxide , Single crystal , Rutile , Photoemission , NEXAFS , Adsorption geometry , Amino acid
