Related Experiment Video
Updated: Mar 17, 2026
11:42
Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
Published on: July 24, 2015
16.2K
Substitutional 4d and 5d impurities in graphene
Tomás Alonso-Lanza1, Andrés Ayuela, Faustino Aguilera-Granja
1Centro de Física de Materiales CFM-MPC CSIC-UPV/EHU, Donostia International Physics Center (DIPC), Departamento de Física de Materiales, Fac. de Químicas, UPV-EHU, 20018 San Sebastián, Spain. tomas_alonso001@ehu.eus.
Physical Chemistry Chemical Physics : PCCP
|July 22, 2016
Summary
This study explores how 4d and 5d transition metals affect graphene
Area of Science:
- Materials Science
- Condensed Matter Physics
- Computational Chemistry
Background:
- Graphene's unique electronic properties make it a candidate for advanced electronic devices.
- Doping graphene with transition metals can tune its electronic and magnetic characteristics.
- Understanding the impact of different transition metal series (3d, 4d, 5d) is crucial for material design.
Purpose of the Study:
- To investigate the structural and electronic properties of graphene doped with 4d and 5d transition metals.
- To compare the effects of 4d and 5d impurities with those of 3d elements.
- To analyze the magnetic moments and hybridization in doped graphene systems.
Main Methods:
- Density Functional Theory (DFT) calculations were employed.
- Adsorption energies, distances, and magnetic moments were computed for various impurities.
- Electronic structure and hybridization effects were analyzed.
Main Results:
- 4d and 5d metals exhibit similar adsorption trends to 3d elements in later periodic groups.
- Lanthanide contraction influences adsorption energies and magnetic moments in earlier groups for 4d and 5d impurities.
- Hybridization between larger 4d/5d elements and carbon atoms reduces spin splitting, altering magnetic properties compared to 3d dopants.
Conclusions:
- The magnetic properties of graphene can be significantly tuned by using 4d or 5d impurities instead of 3d elements.
- The larger atomic size and electronic structure of 4d/5d metals lead to distinct hybridization and magnetic behaviors in graphene.
- These findings offer new pathways for designing magnetic graphene materials with tailored properties.
Related Concept Videos
01:26Imperfections in Crystal Structure: Stoichiometric Point Defects
53
Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
53
01:29Imperfections in Crystal Structure: Non-Stoichiometric Defects
31
Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
31
01:25Imperfections in Crystal Structure: Point, Line and Plane Defects
42
A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
42
01:20Types of Semiconductors
1.7K
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
1.7K
02:18Network Covalent Solids
16.4K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
16.4K
03:35Hybridization of Atomic Orbitals II
50.1K
sp3d and sp3d 2 Hybridization
50.1K