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Photocatalytic reactions at the graphite/ice interface.

Johan Bergeld¹, Bengt Kasemo, Dinko Chakarov

¹Department of Applied Physics, Chalmers University of Technology, S- 412 96, Göteborg, Sweden. johan.bergeld@gmail.com

Physical Chemistry Chemical Physics : PCCP

|February 14, 2008

Summary

Photodissociation of water molecules on potassium-doped ice/graphite interfaces was investigated. The ice layer influences photoreactions driven by graphite

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Area of Science:

Surface Science
Photochemistry
Materials Science

Background:

Photodissociation reactions are crucial in various chemical processes.
Understanding interfacial reactions is key to catalysis and material modification.
Previous studies explored similar reactions without an ice layer.

Purpose of the Study:

Investigate water photodissociation at the ice/graphite interface with potassium.
Determine the influence of ice film thickness and morphology on photoreactions.
Assess the confinement effects and product permeability through the ice layer.

Main Methods:

Growing ice films at cryogenic temperatures under ultrahigh vacuum.
Utilizing UV-Vis photon transparent ice films (240-900 nm).
Leveraging energetic charge carriers generated in the graphite substrate to drive reactions.

Main Results:

Demonstrated that energetic charge carriers from graphite can drive interfacial photoreactions.
Observed confinement effects of the ice layer on the photodissociation process.
Investigated the permeability of the ice film for reaction products.

Conclusions:

The ice layer significantly modifies water photodissociation at the ice/graphite interface.
Confinement and permeability are critical factors influenced by ice morphology.
This study provides insights into interfacial photoreactions relevant to astrobiology and materials science.