Strong substrate mediation of attractive lateral interactions of CO on Cu(110)
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The mechanism of chemical reactions between adsorbed species is defined by the combined effects of the adsorbate–substrate potential landscape and lateral interactions. Such lateral interactions are therefore integral to catalytic processes, but their study is often complicated by “substrate mediation”, the regulation of a two-body potential between adsorbed particles by the surface itself. Substrate mediation can influence the sign and magnitude of lateral interactions. There are notable exceptions of ordered structures forming at low coverage, indicative of short-range attractive forces where repulsive forces are expected to dominate, suggesting a strong substrate-mediated contribution. To explore further the origins of such interactions, we have investigated the adsorption of CO on Cu(110) using a combination of low-temperature microscopy and first-principles calculations. Our studies reveal that lateral adsorbate interactions, which are constrained by the metal surface, regulate the bonding between the adsorbate and substrate. Anisotropic CO–CO coupling is seen to arise from a perfect balance between the intermolecular accumulation of charge that acts as a glue (chemical coupling) at sufficiently large distances to avoid repulsive effects (dipole–dipole coupling and Pauli’s repulsion between electron clouds).
Garrido Torres , J A , Finley , K L , Früchtl , H A , Webb , P B & Schaub , R 2019 , ' Strong substrate mediation of attractive lateral interactions of CO on Cu(110) ' , Langmuir , vol. 35 , no. 3 , pp. 608–614 . https://doi.org/10.1021/acs.langmuir.8b02808
© 2018, American Chemical Society. This work has been made available online in accordance with the publisher's policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1021/acs.langmuir.8b02808
DescriptionFunding: Scottish Funding Council (through EaStCHEM and SRD-Grant HR07003), EPSRC (PhD studentship for JAGT, EP/M506631/1), Royal Society Industry Fellowship (PBW).
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