SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 18: Poster Session II: Metal substrates II
O 18.8: Poster
Montag, 1. März 2021, 13:30–15:30, P
Adsorption and reactivity of monodispersed silver clusters stabilized by an organic network — •Vishkaya Jayalatharachchi1, Elizabeth Graham1,2, Jennifer MacLeod1, and Josh Lipton-Duffin1,2 — 1Queensland University of Technology, Brisbane,Australia — 2Central Analytical Research Facility (CARF)
In this study, we investigate the chemical and electronic structures of Ag metal clusters coordinated by deprotonated 1,3,5-benzenetricarboxylic acid (TMA) molecules on Ag(111) using soft x-ray spectroscopy techniques. Deprotonation was examined by X-ray photoemission spectroscopy (XPS) and scanning tunnelling microscopy (STM). We used Near edge X-ray absorption fine structure spectroscopy (NEXAFS) in these experiments to study the molecular geometry after deprotonation of the carboxylic/ carboxylate groups via C-K edge/ O-K edge measurements. Evolution of HOMO-LUMO levels has been studied using combination of Valence band spectra and Resonant photoemission spectroscopy (RESPES) and compared with the calculated density of states with corresponding charge distribution of intact TMA and deprotonated TMA molecules.
Careful study of the chemical and electronic structure of these clusters will allow us to better understand how to use organic molecules to engineer arrays of single-atom catalysts on surfaces, with the goal of tailoring these 2D materials systems for reactivity and selectivity in targeted catalysed reaction.