Journal
SURFACE SCIENCE
Volume 685, Issue -, Pages 24-33Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.susc.2019.01.013
Keywords
Scanning tunneling microscopy; Pt-silicide; 1D systems; Dislocation lines; Hexagonal boron nitride protection
Categories
Funding
- Graphene Flagship [696656]
- Excellence Initiative of the German federal and state governments
- Hungarian Academy of Sciences, within the framework of the MTA EK Lendiilet Topology in Nanomaterials Research Group [LP2017-9/2017]
- DFG through the Collaborative Research Center [SFB 1238]
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Using scanning tunneling microscopy, we study the regime of submonolayer Si deposition on Pt(111) at 300 K. We find a novel network of one-dimensional chains embedded into the Pt surface. Even in ultrahigh vacuum, these chains disappear within a few hours in favor of clusters on top of the Pt surface. Exposing the chains to different gases reveals that CO effectively induces the lifting. However, the Si chains can be protected by a monolayer of hexagonal BN (h-BN) deposited prior to the Si deposition. Then, the chains survive even an exposure for ten min to air. Interestingly, the Si chains below the h-BN are rotated by 30(degrees) with respect to the ones on the bare Pt(111). This might be related to the anisotropic elastic modulus of the h-BN on top.
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