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Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy
Published on: May 27, 2018
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Formation and structural characterization of two-dimensional wetting water layer on graphite (0001).
Takashi Yamada1, Takenori Tawa1, Natsumi Murase1
1Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan.
The Journal of Chemical Physics
|August 20, 2022
Summary
Researchers studied water
Area of Science:
- Surface Science
- Materials Science
- Physical Chemistry
Background:
- Understanding water's behavior at interfaces is crucial for nucleation and reactivity.
- Graphite surfaces are considered hydrophilic when clean, despite ambient hydrophobicity.
Purpose of the Study:
- Investigate the molecular structure and wettability of monolayer water on graphite.
- Explore the hydrophilic nature of clean graphite surfaces at a molecular level.
Main Methods:
- Employed low-energy electron diffraction (LEED) for structural analysis.
- Utilized scanning tunneling microscopy (STM) to visualize surface structure.
Main Results:
- Observed a (2 × 2) periodicity in LEED patterns at monolayer coverage.
- STM revealed a hexagonal network of hydrogen-bonded water molecules.
- Identified a lattice constant 9% larger than conventional ice, indicating an extended ice network.
Conclusions:
- The formation of a well-ordered ice monolayer on graphite suggests significant substrate-molecule interactions.
- This ordered structure differs from water monolayers on metal surfaces.
- Confirms the hydrophilic nature of clean graphite surfaces through molecular arrangement.
