AVS 51st International Symposium
    Surface Science Tuesday Sessions
       Session SS-TuP

Paper SS-TuP41
Adsorption of L-phenylglycine on Anatase TiO@sub2@(101) and (001): A NEXAFS and Photoemission Study

Tuesday, November 16, 2004, 4:00 pm, Room Exhibit Hall B

Session: Poster Session
Presenter: A.G. Thomas, University of Manchester, UK
Authors: A.G. Thomas, University of Manchester, UK
C. Chatwin, University of Manchester, UK
W.R. Flavell, University of Manchester, UK
D. Tsoutsou, University of Manchester, UK
T. Johal, CCLRC Daresbury Laboratory, UK
J. Purton, CCLRC Daresbury Laboratory, UK
Correspondent: Click to Email
We present a study of the adsorption of L-phenylglycine from submonolayer to multilayer coverage on the (101)(1x1) surface of anatase phase TiO@sub2@. Photoemission is used to determine changes to the electronic structure of the substrate and adsorbate and the NEXAFS searchlight effect is used to determine the orientation of the phenylglycine on the substrate. NEXAFS spectra recorded from multilayers adsorbed from the vacuum show good agreement with solvent deposited thick films of glycine and phenylalanine@footnote 1@. From the intensity dependence of the ring @pi@* resonance on photon incidence angle in NEXAFS it appears that the molecule forms a disordered layer at all coverages studied here. Furthermore, again at all coverages studied, it appears that N is being lost from the amino acid molecule with time through a photon induced process. A similar result has been observed when glycine adsorbed on the rutile TiO@sub2@ (110)(1x2) surface is subjected to photons of energy 55 eV@footnote 2@. @FootnoteText@ @footnote 1@ J. Boese, A. Osanna, C. Jacobsen, J.Kirz. J. Electron Spectroscopy and Relat. Phenom. 85 (1997) 9.@footnote 2@ E. Soria, I. Colera, E. Roman, E.M. Williams, J.L. De Segovia. Surface Science 451 (2000) 188.