Size-dependent reactivity of self-organized nanostructured O/Cu(110) surfaces towards H^sub 2^S

Scanning tunneling microscopy was used to study the reactivity of self-organized nanostructured O/Cu(110) surfaces towards H2S. We took advantage of the fast and easy nanostructuring process of the O/Cu(110) system to study in detail the reaction mechanisms on three structures having different width...

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Bibliographic Details
Published in:Surface science 2017-01, Vol.655, p.49
Main Authors: Poulain, Clément, Budinská, Zuzana, Wiame, Frédéric, Maurice, Vincent, Marcus, Philippe
Format: Article
Language:English
Subjects:
Adsorption
Copper oxides
Edgelines
Hydrogen sulfide
Island growth
Islands
Metal surfaces
Microscopy
Nanostructure
Nanostructured materials
Reaction mechanisms
Reactivity
Studies
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Summary:Scanning tunneling microscopy was used to study the reactivity of self-organized nanostructured O/Cu(110) surfaces towards H2S. We took advantage of the fast and easy nanostructuring process of the O/Cu(110) system to study in detail the reaction mechanisms on three structures having different width of CuO stripes. Detachment of Cu-O chains from CuO stripes occurred in all cases but the formation of S-c(2 x2) islands was observed only on wider ( >10 nm) CuO stripes. At low exposure, structures were observed at the CuO stripe edge. Linear structures, aligned along the image direction and showing 2 x periodicity, were also observed on copper stripes. The competition between detachment and c(2 x 2) island growth mechanism depends on the H2S adsorption rate. At higher pressure, it is shown that the sulfidation only proceeds by sulfur islands growth in wider CuO stripes. These results show that self-organized nanostructures on metal surfaces are powerful tools to study reactions at the nanometer scale and the relationship between local structure and reactivity.
ISSN:0039-6028