Adsorption and reaction of glycine on the rutile TiO2(011) single crystal surface

J N Wilson, R M Dowler, H Idriss

Research output: Contribution to journalLiterature review

20 Citations (Scopus)

Abstract

The adsorption and reaction of glycine on the surface of a rutile TiO2(011) single crystal has been studied by X-ray Photoelectron Spectroscopy (XPS) and Temperature Programmed Desorption (TPD) techniques. Special attention was given to the formation and stability of the zwitterion structure (+NH3–CH2–COO-) in comparison to that of the dissociated structure (NH2–CH2–COO-). Both species have been observed on the surface at 300 K. The zwitterion structure was found less stable than the dissociated structure. This is in line with other experimental results related to proline on rutile TiO2(110) single crystal [13, 14], glycine on rutile TiO2(110) single crystal [17, 24] and computational results related to glycine on rutile TiO2(110) single crystal [25]. By 500 K most of the zwitterion structure has been converted to the dissociated one. TPD results indicated that glycine reacts in a similar way to carboxylic acids on this surface with the main decomposition products being ketene (CH2=C=O). Other masses left unassigned for were also observed during TPD. The most intense being m/e 55 that might be due to =CH–C(O)N=or C(O)N=CH fragments.
Original languageEnglish
Pages (from-to)206-213
Number of pages8
JournalSurface Science
Volume605
Issue number1-2
Early online date20 Oct 2010
DOIs
Publication statusPublished - Jan 2011

Keywords

  • TiO2(011)
  • glycine
  • zwitterion
  • glycine-TPD
  • ketene
  • reaction mechanism
  • glycine-XPS

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