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Computational prediction of core-level spectroscopy of metal-organic interfaces to reveal chemical interactions, bonding and behaviours

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Hall, Samuel J. (2022) Computational prediction of core-level spectroscopy of metal-organic interfaces to reveal chemical interactions, bonding and behaviours. PhD thesis, University of Warwick.

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Official URL: http://webcat.warwick.ac.uk/record=b3821648

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Abstract

Molecules adsorbed onto metal surfaces, especially carbon-based aromatic molecules, can provide systems that offer tunable properties and can be used in organic light-emitting diodes (OLEDs). It is important to understand the behaviour of these systems at a molecular level in order to rationally engineer interfaces with specific properties. Core-level spectroscopy can provide a beneficial method to probe aspects of molecule-metal interfaces such as geometrical structure, stability, chemical bonding and electronic structure. X-ray photoelectron spectroscopy (XPS) and near-edge absorption fine structure (NEXAFS) spectroscopy can be used in tandem to gain
significant insight into the studied system. However, the resulting spectra from these techniques can often prove hard to fully analyse as they contain multiple close-lying features and loss of clarity from broadening. This is where simulations of spectra can come in to help to disentangle and interpret spectra. This thesis establishes practical
simulation workflows to predict XPS and NEXAFS spectra of metal-organic interfaces based on Density Functional Theory (DFT). These methods are applied to study the adsorption of aromatic adsorbates on metal surfaces, two-dimensional networks, and an oxidised diamond surface. As part of this work, the assessment of the performance
and accuracy of simulations against experiment was carried out. Core-level simulations on various systems were performed to rationalise experimental findings on structure, stability, and surface chemical bonding.

Item Type: Thesis (PhD)
Subjects: Q Science > QD Chemistry
Library of Congress Subject Headings (LCSH): X-ray photoelectron spectroscopy, X-ray absorption near edge structure, Chemical bonds, Chemistry, Organic, Surface chemistry, Spectrum analysis
Official Date: 2022
Dates:
DateEvent
2022UNSPECIFIED
Institution: University of Warwick
Theses Department: Department of Chemistry
Thesis Type: PhD
Publication Status: Unpublished
Supervisor(s)/Advisor: Maurer, Reinhard ; Klein, Benedikt P, ; Michelitsch, Georg
Sponsors: EPSRC Centre for Doctoral Training in Molecular Analytical Science
Format of File: pdf
Extent: xviii, 186 leaves : colour illustrations
Language: eng

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