Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: 2D materials beyond graphene: TMDCs, silicene and relatives I

O 36.7: Vortrag

Dienstag, 13. März 2018, 15:30–15:45, MA 043

Kelvin Probe Force Microscopy examination of defects of h-BN on Pt(111) — •Gino Günzburger, Roland Widmer, Liwei Liu, and Oliver Gröning — Nanotech@surfaces Laboratory, Empa - Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland

Epitaxial hexagonal boron nitride (h-BN) is an interesting material, which has attracted significant scientific interest for more than a decade. It has a hexagonal structure similar to the one of Graphene and it forms monolayers on many metals. The mono-layers have varying and interesting structures, such as a flat and even layers as on Ni(111), specific Moiré-patterns such as on Pt(111) and corrugated structures called "nanomesh" due to their mesh-like appearance (e.g on Rh(111)). The structure of the formed layer depends not only on the lattice mismatch between the h-BN and the substrate, but also on the strength of the interaction between the two [1]. We deposited an h-BN monolayer on Pt(111) by thermal decomposition of borazine (Cyclotriborazan, (BHNH)3) on the hot substrate and subsequently examined it by STM and Kelvin Probe Force Microscopy (KPFM) using a Qplus STM/AFM in UHV at approximately 5K. On Pt(111) h-BN forms a Moiré pattern showing bright dots on a darker background when examined by STM at a high gap voltage. Defects in the h-BN appear as black spots in the STM image. They were located by STM, examined by KPFM and identified as regions of higher work function.

[1] L. Camilli, E. Sutter and P. Sutter, 2D Materials 1, 025003 (2014)