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Instruments / Technical Area	Publication Details	Published	Actions
I09-Surface and Interface Structural Analysis	Growth and electronic properties of bi- and trilayer graphene on Ir(111) Claus F. P. Kastorp , David A. Duncan , Martha Scheffler , John D. Thrower , Anders L. Jørgensen , Hadeel Hussain , Tien-Lin Lee , Liv Hornekaer , Richard Balog Nanoscale 353 DOI: 10.1039/D0NR04788K Diamond Proposal Number(s): [16243] Open Access Show Abstract ▼ Abstract: Interesting electronic properties arise in vertically stacked graphene sheets, some of which can be controlled by mutual orientation of the adjacent layers. In this study, we investigate the MBE grown multilayer graphene on Ir(111) by means of STM, LEED and XPS and we examine the influence of the substrate on the geometric and electronic properties of bilayer graphene by employing XSW and ARPES measurements. We find that the MBE method does not limit the growth to two graphene layers and that the wrinkles, which arise through extended carbon deposition, play a crucial role in the multilayer growth. We also find that the bilayer and trilayer graphene sheets have graphitic-like properties in terms of the separation between the two layers and their stacking. The presence of the iridium substrate imposes a periodic potential induced by the moiré pattern that was found to lead to the formation of replica bands and minigaps in bilayer graphene. From tight-binding fits to our ARPES data we find that band renormalization takes place in multilayer graphene due to a weaker coupling of the upper-most graphene layer to the iridium substrate.	Sep 2020
I09-Surface and Interface Structural Analysis	Chemically-resolved determination of hydrogenated graphene-substrate interaction Anders L. Jørgensen , David A. Duncan , Claus F. P. Kastorp , Line Kyhl , Zeyuan Tang , Albert Bruix , Mie Andersen , Bjork Hammer , Tien-lin Lee , Liv Hornekaer , Richard Balog Physical Chemistry Chemical Physics DOI: 10.1039/C9CP02059D Diamond Proposal Number(s): [16243] Show Abstract ▼ 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.	Jun 2019

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