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Water Chain Formation on TiO2(110)
Junseok Lee1,2, Dan C Sorescu1, Xingyi Deng1,2
1†National Energy Technology Laboratory, Department of Energy, Pittsburgh, Pennsylvania 15236, United States.
The Journal of Physical Chemistry Letters
|August 21, 2015
Summary
Water molecules form one-dimensional chains on titanium dioxide (TiO2) surfaces at low temperatures. Hydrogen bonding drives chain formation, which is energetically favorable and facilitated by diffusion at higher temperatures.
Area of Science:
- Surface science
- Materials chemistry
- Physical chemistry
Background:
- Understanding water adsorption on metal oxide surfaces is crucial for catalysis and nanotechnology.
- Rutile titanium dioxide (TiO2) is a widely studied semiconductor with applications in photocatalysis and sensors.
Purpose of the Study:
- To investigate the initial stages of water adsorption and self-assembly on a reduced rutile TiO2(110)-(1×1) surface.
- To elucidate the role of hydrogen bonding in water adlayer formation.
Main Methods:
- Scanning tunneling microscopy (STM) was used to visualize water adsorption structures at the nanoscale.
- Density functional theory (DFT) calculations were employed to determine the energetic stability of different adsorption configurations.
Main Results:
- At 50 K, isolated water monomers adsorb on Ti atoms.
- At higher coverages, water molecules self-assemble into one-dimensional hydrogen-bonded chains along the Ti row.
- DFT calculations confirm that chain formation is energetically favorable compared to monomer adsorption.
- Thermal annealing promotes water diffusion and the formation of longer chains.
Conclusions:
- Water adsorption on TiO2(110) proceeds via monomer adsorption followed by self-assembly into 1D chains.
- Hydrogen bonding plays a critical role in stabilizing these initial water structures.
- The findings offer fundamental insights into the initial wetting processes on oxide surfaces.
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