Reference : Desorption of H2O from Flat and Stepped Pt(111)
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Desorption of H2O from Flat and Stepped Pt(111)
Picolin, Alexander [> >]
Busse, Carsten [> >]
Redinger, Alex mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit]
Morgenstern, Markus [> >]
Michely, Thomas [> >]
Journal of Physical Chemistry. C, Nanomaterials and interfaces
[en] To investigate the effect of steps on H2O binding on a nominal Pt(111) surface, we used thermal desorption spectroscopy of water adsorbed on purposefully nanostructured surfaces: a rippled surface containing densely packed (100)-microfaceted and (111)-microfaceted steps was created using grazing incidence ion bombardment, and a surface with triangular mounds mainly consisting of (111)-microfaceted steps was fabricated through hornoepitaxial growth. These morphologies are determined by scanning tunneling microscopy. We find two additional high -temperature H2O desorption peaks using the rippled surface, whereas only the peak with the highest desorption temperature is present on the (111)-microfaceted mound. Thus, water preferentially binds to steps and especially favors (111)-microfaceted ones. Furthermore, the large step concentration on our nanostructured surfaces precludes the coexistence of a condensed and a diluted phase in a monolayer of water and suppresses the formation of crystalline ice multilayers during heating.

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