Chemically-resolved determination of hydrogenated graphene-substrate interaction

DOI: 10.1039/C9CP02059D

Authors: Anders L. Jørgensen (Aarhus University) , David A. Duncan (Diamond Light Source) , Claus F. P. Kastorp (Aarhus University) , Line Kyhl (Aarhus University) , Zeyuan Tang (Aarhus University) , Albert Bruix (Technische Universitat Munchen) , Mie Andersen (Technische Universitat Munchen) , Bjork Hammer (Aarhus University) , Tien-lin Lee (Diamond Light Source) , Liv Hornekaer (Aarhus University) , Richard Balog (Aarhus University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Chemistry Chemical Physics

State: Published (Approved)
Published: June 2019
Diamond Proposal Number(s): 16243

Abstract: Functionalization of graphene on Ir(111) is a promising route to modify graphene by chemical means in a controlled fashion at the nanoscale. Yet, the nature of such functionalized sp3 nanodots remains unknown. Density functional theory (DFT) calculations alone cannot differentiate between two plausible structures, namely true graphane and substrate stabilized graphane-like nanodots. These two structures, however, interact dramatically differently with the underlying substrate. Discriminating which type of nanodots forms on the surface is thus of paramount importance for the applications of such prepared nanostructures. By comparing X-ray standing wave measurements against theoretical model structures obtained by DFT calculations we are able to exclude the formation of true graphane nanodots and clearly show the formation graphane-like nanodots.

Subject Areas: Chemistry


Instruments: I09-Surface and Interface Structural Analysis