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Dissociation of CH₃–O as a Driving Force for Methoxyacetophenone Adsorption on Si(001)

O'Donnell, KM; Byron, C; Moore, G; Thomsen, L; Warschkow, O; Teplyakov, AV; Schofield, SR; (2019) Dissociation of CH₃–O as a Driving Force for Methoxyacetophenone Adsorption on Si(001). The Journal of Physical Chemistry C , 123 (36) pp. 22239-22249. 10.1021/acs.jpcc.9b04954. Green open access

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Abstract

The coverage-dependent behavior of p-methoxyacetophenone on the clean Si(001) surface was followed using X-ray photoelectron spectroscopy and supporting density functional theory calculations. Unlike other multifunctional organic molecules, this compound exhibits a high selectivity of adsorbate species formation by forming only two distinct adsorbate structures at low coverage, with a third configuration forming at high coverages. At low coverage, surface chemisorption is driven by methoxy group dissociation. However, at high coverage, the surface footprint required for this process is no longer available, leading to the formation of less thermodynamically stable adsorbates that are datively bonded to the surface with a smaller footprint. This coverage-dependent but well-defined behavior is promising in designing functional organic–inorganic interfaces on silicon.

Type: Article
Title: Dissociation of CH₃–O as a Driving Force for Methoxyacetophenone Adsorption on Si(001)
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/acs.jpcc.9b04954
Publisher version: https://doi.org/10.1021/acs.jpcc.9b04954
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Chemical structure, Silicon, Energy, Binding energy, Adsorption
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/10080519
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