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Instruments / Technical Area	Publication Details	Published	Actions
I09-Surface and Interface Structural Analysis	Growth, domain structure, and atomic adsorption sites of hBN on the Ni(111) surface Miriam Raths , Christina Schott , Johannes Knippertz , Markus Franke , You-Ron Lin , Anja Haags , Martin Aeschlimann , Christian Kumpf , Benjamin Stadtmüller Physical Review Materials 5 DOI: 10.1103/PhysRevMaterials.5.094001 Diamond Proposal Number(s): [18787] Show Abstract ▼ Abstract: One of the most important functionalities of the atomically thin insulator hexagonal boron nitride (hBN) is its ability to chemically and electronically decouple functional materials from highly reactive surfaces. It is therefore of utmost importance to uncover its structural properties on surfaces on an atomic and mesoscopic length scale. In this paper, we quantify the relative coverages of structurally different domains of a hBN layer on the Ni(111) surface using low-energy electron microscopy and the normal incidence x-ray standing wave technique. We find that hBN nucleates on defect sites of the Ni(111) surface and predominantly grows in two epitaxial domains that are rotated by 60 ∘ with respect to each other. The two domains reveal identical adsorption heights, indicating a similar chemical interaction strength with the Ni(111) surface. The different azimuthal orientations of these domains originate from different adsorption sites of N and B. We demonstrate that the majority ( ≈ 70 % ) of hBN domains exhibit a ( N , B ) = ( top , fcc ) adsorption site configuration while the minority ( ≈ 30 % ) show a ( N , B ) = ( top , hcp ) configuration. Our study hence underlines the crucial role of the atomic adsorption configuration in the mesoscopic domain structures of in situ fabricated two-dimensional materials on highly reactive surfaces.	Sep 2021
I09-Surface and Interface Structural Analysis	Characterization of growth and structure of TCNQ phases on Ag(111) P. J. Blowey , A. Haags , L. A. Rochford , J. Felter , D. A. Warr , D. A. Duncan , Tien-Lin Lee , G. Costantini , C. Kumpf , D. P. Woodruff Physical Review Materials 3 DOI: 10.1103/PhysRevMaterials.3.116001 Diamond Proposal Number(s): [12975] Show Abstract ▼ Abstract: A combination of scanning tunneling microscopy, low-energy electron diffraction,and low-energy electron microscopy (LEEM) has been used to identify the structural phases formed by 7,7,8,8-tetracyanoquinodimethane (TCNQ) on Ag(111). These comprise a two-dimensional gas phase, a low-density commensurate (LDC) phase, and a higher-density incommensurate (HDI) phase. LEEM also shows the presence of an additional “precursor-HDI” phase with a surface unit mesh area only ≈3% less than the HDI phase. Normal incidence x-ray standing-wave measurements of the HDI phase yield almost identical structural parameters to the LDC phase for which a full structure determination has been previously reported. The results show TCNQ does not adopt the inverted bowl distortion favored in earlier density functional theory calculations of TCNQ on coinage metal surfaces, but the N atoms are twisted out of the molecular plane, an effect found for the LDC phase to be due to incorporation of Ag adatoms. The possible role of Ag adatoms in the HDI phase, and in the transition from the precursor-HDI phase, is discussed.	Nov 2019

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