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Publication Detail
Bonding of Methyl Phosphonate to TiO2(110)
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Pang CL, Watkins M, Cabailh G, Ferrero S, Ngo LT, Chen Q, Humphrey DS, Shluger AL, Thornton G
  • Publisher:
    AMER CHEMICAL SOC
  • Publication date:
    14/10/2010
  • Pagination:
    16983, 16988
  • Journal:
    J PHYS CHEM C
  • Volume:
    114
  • Issue:
    40
  • Print ISSN:
    1932-7447
  • Language:
    EN
  • Keywords:
    SCANNING TUNNELING MICROSCOPE, RUTILE TIO2(110), TIO2, ADSORPTION, SURFACE, MOLECULES, OXIDE, ACID, PSEUDOPOTENTIALS, REACTIVITY
  • Addresses:
    Thornton, G
    UCL
    London Ctr Nanotechnol
    London
    WC1H 0AJ
    England

    UCL
    Dept Chem
    London
    WC1H 0AJ
    England

    Univ Washington
    Dept Chem
    Seattle
    WA
    98195
    USA
Abstract
We have used scanning tunneling, microscopy (STM), noncontact atomic force microscopy (NC-AFM), low energy electron diffraction (LEED), and ab initio calculations to study adsorbates resulting from exposure of rutile TiO2(110)1 x 1 to methyl phosphonic acid (Ch(3)P=O(OH)(2)). At low exposures, adsorbates appear on the 5-fold coordinated Ti (Ti-5c) rows. As the coverage of adsorbates approaches 0.5 ML. STM images show an ordered 2 x 1 overlayer consistent with LEED. We propose that the phosphonic acid is deprotonated with the resulting phosphonate bridging across two adjacent Ti-5c atoms in the [001] direction. This bridging conformation would lead to the observed 2 x 1 overlayer and is analogous to that found for a range of carboxylates adsorbed on TiO2(110).
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