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Photoemission core level binding energies from multiple sized nanoparticles on the same support: TiO₂(110)/Au

Mellor, A; Wilson, A; Pang, CL; Yim, CM; Maccherozzi, F; Dhesi, SS; Muryn, CA; ... Thornton, G; + view all (2020) Photoemission core level binding energies from multiple sized nanoparticles on the same support: TiO₂(110)/Au. The Journal of Chemical Physics , 152 (2) , Article 024709. 10.1063/1.5135760. Green open access

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Abstract

A novel method of measuring the core level binding energies of multiple sized nanoparticles on the same substrate is demonstrated using the early stage of Au nanoparticle growth on reduced r-TiO2(110). This method employed in situ scanning tunneling microscopy (STM) and microfocused X-ray photoemission spectroscopy. An STM tip-shadowing method was used to synthesize patterned areas of Au nanoparticles on the substrate with different coverages and sizes. Patterns were identified and imaged using a UV photoelectron emission microscope. The Au 4f core level binding energies of the nanoparticles were investigated as a function of Au nanoparticle coverage and size. A combination of initial and final state effects modifies the binding energies of the Au 4f core levels as the nanoparticle size changes. When single Au atoms and Au3 clusters are present, the Au 4f7/2 binding energy, 84.42 eV, is similar to that observed at a high coverage (1.8 monolayer equivalent), resulting from a cancellation of initial and final state effects. As the coverage is increased, there is a decrease in binding energy, which then increases at a higher coverage to 84.39 eV. These results are consistent with a Volmer-Weber nucleation-growth model of Au nanoparticles at oxygen vacancies, resulting in electron transfer to the nanoparticles.

Type: Article
Title: Photoemission core level binding energies from multiple sized nanoparticles on the same support: TiO₂(110)/Au
Open access status: An open access version is available from UCL Discovery
DOI: 10.1063/1.5135760
Publisher version: https://doi.org/10.1063/1.5135760
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
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 > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10090083
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