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Desorption of H2O from Flat and Stepped Pt(111)
- Source :
- The Journal of Physical Chemistry C. 113:691-697
- Publication Year :
- 2008
- Publisher :
- American Chemical Society (ACS), 2008.
-
Abstract
- 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 homoepitaxial 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...
- Subjects :
- Materials science
Thermal desorption spectroscopy
Analytical chemistry
Ion bombardment
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
law.invention
General Energy
Adsorption
law
Phase (matter)
Desorption
Monolayer
Physical and Theoretical Chemistry
Scanning tunneling microscope
Subjects
Details
- ISSN :
- 19327455 and 19327447
- Volume :
- 113
- Database :
- OpenAIRE
- Journal :
- The Journal of Physical Chemistry C
- Accession number :
- edsair.doi...........189092d17d2bb921191c1bc7ec3e7710