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Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy
Published on: July 28, 2020
Time-resolved sum frequency generation reveals adsorbate migration between different surface active sites on titanium
Jun Chen1, Jun Kubota, Akihide Wada
1Japan Science and Technology Agency, 4-1-8 Hon-cho, Kawaguchi-shi, Saitama 332-0012, Japan.
Journal of the American Chemical Society
|April 2, 2009
Summary
Picosecond sum frequency generation (SFG) spectroscopy revealed how formate molecules migrate between surface sites on titanium oxide films. This migration explains the simultaneous thermal decomposition of formate on different active sites.
Area of Science:
- Surface science
- Physical chemistry
- Spectroscopy
Background:
- Titanium oxide films on Pt(111) exhibit distinct surface active sites.
- Formate adsorption on these sites can lead to thermal decomposition.
- Understanding formate migration kinetics is crucial for surface reactions.
Purpose of the Study:
- To resolve the thermally driven migration of formate between different surface active sites.
- To investigate the kinetic process governing formate decomposition.
- To determine the enthalpy difference between formate species.
Main Methods:
- Picosecond sum frequency generation (SFG) spectroscopy.
- Laser-induced temperature jump technique.
- Kinetic analysis of surface reactions.
Main Results:
- Successfully resolved formate migration between two types of surface active sites.
- Demonstrated that this migration explains in-phase thermal decomposition.
- Estimated the enthalpy difference (ΔH) between formate species to be approximately 3 kJ mol⁻¹.
Conclusions:
- Formate migration is a key kinetic process on titanium oxide surfaces.
- The study provides insights into the thermal behavior of adsorbed formate.
- SFG spectroscopy is a powerful tool for studying surface dynamics.
