Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 84: Poster Focus Session: Structure and Chemistry of Metal-Oxide Surfaces

O 84.7: Poster

Mittwoch, 14. März 2018, 18:15–20:30, Poster A

Measuring the work function of ultrathin FeO(111) films on Ag(111) using STM — •Ying Wang, Visnja Babacic, and Mikolaj Lewandowski — NanoBioMedical Centre, Adam Mickiewicz University, Umultowska 85, 61-614 Poznan, Poland

Ultrathin films constitute a new class of 2D materials which, due to finite size effects, exhibit unique physical and chemical properties not observed for the corresponding bulk materials. It was experimentally and theoretically shown that ultrathin FeO(111) films grown on Pt(111) exhibit superior catalytic activity in the CO oxidation reaction as compared to clean Pt(111) [J. Catal 266 (2009) 359; Angew. Chem. Int. Ed. 49 (2010) 4418]. This enhanced activity was found to be related, among other factors, to the work function of the FeO(111)/Pt(111) system. We used scanning tunneling microscopy (STM) operating in dI/dz spectroscopy mode to measure the work function of ultrathin FeO(111) films grown on Ag(111). The results are compared to those obtained for FeO(111) on Pt(111).

Acknowledgment: The "Multifunctional ultrathin Fe(x)O(y), Fe(x)S(y) and Fe(x)N(y) films with unique electronic, catalytic and magnetic properties" project is carried out within the First TEAM programme of the Foundation for Polish Science (project number First TEAM/2016-2/14) co-financed by the European Union under the European Regional Development Fund.