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Issue 3, 2019
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Crystallization kinetics of thin water films on Pt(111): effects of oxygen and carbon-monoxide adspecies

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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 (√3 × √3)R30° structure formed on oxygenated Pt(111) up to 200 K.

Graphical abstract: Crystallization kinetics of thin water films on Pt(111): effects of oxygen and carbon-monoxide adspecies

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Publication details

The article was received on 16 Oct 2018, accepted on 11 Dec 2018 and first published on 04 Jan 2019


Article type: Paper
DOI: 10.1039/C8CP06438E
Citation: Phys. Chem. Chem. Phys., 2019,21, 1123-1130
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    Crystallization kinetics of thin water films on Pt(111): effects of oxygen and carbon-monoxide adspecies

    R. Souda and T. Aizawa, Phys. Chem. Chem. Phys., 2019, 21, 1123
    DOI: 10.1039/C8CP06438E

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