Crystallization kinetics of thin water films on Pt(111): effects of oxygen and carbon-monoxide adspecies.
Phys Chem Chem Phys
; 21(3): 1123-1130, 2019 Jan 21.
Article
em En
| MEDLINE
| ID: mdl-30607420
ABSTRACT
This paper describes nucleation, epitaxial growth, and wettability of water on Pt(111) and how they are influenced by oxygen and carbon-monoxide adspecies, based on reflection high energy electron diffraction (RHEED), time-of-flight secondary ion mass spectrometry (TOF-SIMS), and temperature-programmed desorption (TPD). Amorphous solid water deposited onto the pristine Pt(111) substrate crystallizes into ice Ih together with a 2D layer at 150 K, whereas ice Ic (stacking disordered ice or a mixture of ice Ic and Ih) is formed preferentially onto oxygenated Pt(111) (CO-adsorbed Pt(111)) at 155-160 K (150 K). The ice nucleation and epitaxial growth tend to be hampered on the oxygenated Pt(111) surface via hydrogen bond formation with chemisorbed oxygen. The CO-adsorbed Pt(111) surface is hydrophobic, as evidenced by the fact that water forms a complex with CO during evaporation of crystallites at 160-165 K. A disordered 2D layer remains on pristine Pt(111) up to 175 K, whereas an ordered 2D layer exhibiting the (â3 ×â3)R30° structure formed on oxygenated Pt(111) up to 200 K.
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01-internacional
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MEDLINE
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En
Ano de publicação:
2019
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Article