Disordered Adsorbed Water Layers on TiO2 Nanoparticles under Subsaturated Humidity Conditions at 235 K

The interaction of water with TiO2 is of substantial scientific and technological interest as it determines the activity of TiO2 in photocatalytic and environmental applications in nanoparticle suspensions in water, in complex appliances, or in pure form interacting with water vapor. The influence o...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2019-12, Vol.10 (23), p.7433-7438
Main Authors: Orlando, Fabrizio, Artiglia, Luca, Yang, Huanyu, Kong, Xiangrui, Roy, Kanak, Waldner, Astrid, Chen, Shuzhen, Bartels-Rausch, Thorsten, Ammann, Markus
Format: Article
Language:English
Subjects:
adsorption
air
Chemical Sciences
Chemistry
Kemi
Materials Science
mechanisms
nucleation
Other Engineering and Technologies not elsewhere specified
particles
photocatalysis
photoelectron-spectroscopy
Physics
Science & Technology - Other Topics
surfaces
x-ray-absorption
xps
Övrig annan teknik
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Summary:The interaction of water with TiO2 is of substantial scientific and technological interest as it determines the activity of TiO2 in photocatalytic and environmental applications in nanoparticle suspensions in water, in complex appliances, or in pure form interacting with water vapor. The influence of TiO2 nanoparticles on the hydrogen bonding structure of water molecules is an important factor that controls hydration of other species, reactions, or nucleation processes. We use a combination of ambient-pressure X-ray photoelectron spectroscopy and electron yield near-edge X-ray absorption fine structure (NEXAFS) spectroscopy at the oxygen K-edge to investigate the hydrogen bonding structure of adsorbed water on titania nanoparticles in equilibrium with nearly saturated water vapor at 235 K. The results clearly show that the net NEXAFS spectrum of adsorbed water resembles that of liquid, disordered water at 235 K, a temperature at which both homogeneous and heterogeneous freezing of bulk water is anticipated.
ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.9b02779