Intercalated structures formed by platinum on epitaxial graphene on SiC(0001)
arXiv:2502.19524 · doi:10.1016/j.carbon.2025.119989
Abstract
Graphene on SiC intercalated with two-dimensional metal layers, such as Pt, offers a versatile platform for applications in spintronics, catalysis, and beyond. Recent studies have demonstrated that Pt atoms can intercalate at the heterointerface between SiC(0001) and the C-rich R30° reconstructed surface (hereafter referred as the buffer layer). However, key aspects such as intercalated phase structure and intercalation mechanisms remain unclear. In this work, we investigate changes in morphology, chemistry, and electronic structure for both buffer layer and monolayer graphene grown on SiC(0001) following Pt deposition and annealing cycles, which eventually led to Pt intercalation at temperatures above 500°C. Atomic-resolution imaging of the buffer layer reveals a single intercalated Pt layer that removes the periodic corrugation of the buffer layer, arising from partial bonding of C-atoms with Si-atoms of the substrate. In monolayer graphene, the Pt-intercalated regions exhibit a two-level structure: the first level corresponds to a Pt layer intercalated below the buffer layer, while the second level contains a second Pt layer, giving rise to a superstructure relative to graphene. Upon intercalation, Pt atoms appear as silicides, indicating a reaction with Si atoms from the substrate. Additionally, charge neutral -bands corresponding to quasi-free-standing monolayer and bilayer graphene emerge. Analysis of multiple samples, coupled with a temperature-dependent study of the intercalation rate, demonstrates the pivotal role of buffer layer regions in facilitating the Pt intercalation in monolayer graphene. These findings provide valuable insight into Pt intercalation, advancing the potential for applications.
References in corpus (13)
- Quasi-free Standing Epitaxial Graphene on SiC by Hydrogen Intercalation
- Evidence for superconductivity in Li-decorated monolayer graphene
- Revealing the atomic structure of the buffer layer between SiC(0001) and epitaxial graphene
- Semiconductor to metal transition in two-dimensional gold and its van der Waals heterostack with graphene
- Introducing strong correlation effects into graphene by gadolinium intercalation
- Li-intercalated Graphene on SiC(0001): an STM study
- Freestanding n-Doped Graphene via Intercalation of Calcium and Magnesium into the Buffer Layer - SiC(0001) Interface
- Triggering a global density wave instability in graphene via local symmetry-breaking
- Opening and reversible control of a wide energy gap in uniform monolayer graphene
- Intercalated Rare-Earth Metals under Graphene on SiC
- Correlation between morphology and transport properties of quasi-free-standing monolayer graphene
- Stabilizing an atomically thin quantum spin Hall insulator at ambient conditions: Graphene-intercalation of indenene
- Platinum-Decorated Graphene: Experimental Insight into Growth Mechanisms and Hydrogen Adsorption Properties