Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 108: Graphene: Adsorption, Intercalation and Other Aspects
O 108.9: Vortrag
Freitag, 24. März 2017, 12:30–12:45, TRE Ma
Switching the reactivity of graphene on Ir(111) by hydrogen intercalation. — •Richard Balog1, Andrew Cassidy1, Line Kyhl1, Jakob Jorgensen1, Antonia Cabo1, Luca Bignardi1, Paolo Lacovig2, Silvano Lizzit2, Philip Hofmann1, and Liv Hornekaer1 — 1Department of Physics and Astronomy and Interdisciplinary Nanoscience Center iNANO, Aarhus University, Aarhus C DK-8000, Denmark — 2Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 Km 163.5, 34149 Trieste, Italy
In this paper I will present XPS and STM data revealing the modified reactivity of graphene towards hydrogen when intercalated. First I will show that the extent of hydrogen intercalation can be monitored by the progressive downshift of C1s spectra until fully decoupled a quasi-freestanding graphene is formed on Ir(111). Secondly, I will show that this intercalation affects the reactivity of graphene towards H atoms but also vibrationally excited H2 molecules. I will show that while graphene on Ir(111) can be functionalized upon exposure to vibrationally excited H2, the reactions is fully suppressed in a quasi-freestanding state. Controlling the reactivity of graphene towards outer environment simply by modification of its interaction with an underlying substrate paves the way for future application of (functionalized) graphene in everyday devices.