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Imaging the dynamics of individual hydrogen atom intercalated between two graphene sheets
- Publication Year :
- 2017
- Publisher :
- arXiv, 2017.
-
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.<br />Comment: 5 figures
- Subjects :
- Materials science
Hydrogen
chemistry.chemical_element
FOS: Physical sciences
02 engineering and technology
01 natural sciences
law.invention
symbols.namesake
Condensed Matter::Materials Science
law
0103 physical sciences
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Physics::Atomic and Molecular Clusters
Molecule
Physics::Atomic Physics
010306 general physics
Quantum tunnelling
Condensed Matter::Quantum Gases
Condensed Matter - Materials Science
Condensed Matter - Mesoscale and Nanoscale Physics
Graphene
Atoms in molecules
Materials Science (cond-mat.mtrl-sci)
Hydrogen atom
021001 nanoscience & nanotechnology
Bond-dissociation energy
chemistry
Chemical physics
symbols
van der Waals force
Atomic physics
0210 nano-technology
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....638c1be1b6da6ba59fe9a7aa54de4bcd
- Full Text :
- https://doi.org/10.48550/arxiv.1702.07968