Imaging the dynamics of individual hydrogen atom intercalated between two graphene sheets

Abstract

The interlayer gallery between two adjacent sheets of van der Waals materials is expected to modify properties of atoms and molecules confined at the atomic interfaces. Here, we directly image individual hydrogen atom intercalated between two graphene sheets and investigate its dynamics by scanning tunnelling microscope (STM). The intercalated hydrogen atom is found to be remarkably different from atomic hydrogen chemisorbed on external surface of graphene. Our STM measurements, complemented by first-principles calculations, show that the hydrogen atom intercalated between two graphene sheets has dramatically reduced potential barriers for elementary migration steps. Especially, the confined atomic hydrogen dissociation energy from graphene is reduced to 0.34 eV, which is only about a third of a hydrogen atom chemisorbed on graphene. This offers a unique platform for direct imaging of the atomic dynamics of confined atoms. Our results suggest that the atomic interfaces of van der Waals materials may provide a confined environment to tune the interfacial chemical reactions.

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References in corpus (16)

• The Raman Fingerprint of Graphene
• Control of graphene's properties by reversible hydrogenation
• Emergence of magnetism in graphene materials and nanostructures
• Proton transport through one atom thick crystals
• Square ice in graphene nanocapillaries
• Atomic-scale control of graphene magnetism using hydrogen atoms
• Graphene: a perfect nanoballoon
• Observing Atomic Collapse Resonances in Artificial Nuclei on Graphene
• Direct imaging of topological edge states at a bilayer graphene domain wall
• Creating and Probing Electron Whispering Gallery Modes in Graphene
• Van der Waals pressure and its effect on trapped interlayer molecules
• Direct experimental evidence of pi magnetism of a single atomic vacancy in graphene
• Creating One-dimensional Nanoscale Periodic Ripples in a Continuous Mosaic Graphene Monolayer
• Evidence for spin-flip scattering and local moments in dilute fluorinated graphene
• Direct observation of ordered configurations of hydrogen adatoms on graphene
• Hydrogen assisted growth of high quality epitaxial graphene on the C-face of 4H-SiC

Cited by in corpus (5)

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• Atomic Collapse in Disordered Graphene Quantum Dots
• Mass-transport-limited reaction rates and molecular diffusion in the van der Waals gap beneath graphene
• Detecting degeneracy and subtle broken-symmetry states of graphene at nanoscale