Related Experiment Video
Updated: May 2, 2026
14:52
Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding
Published on: September 23, 2018
8.2K
Rotated domain network in graphene on cubic-SiC(001)
Alexander N Chaika1, Olga V Molodtsova, Alexei A Zakharov
1Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow District, 2 Academician Ossipyan str., 142432, Russian Federation. Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), School of Physics, Trinity College Dublin, Dublin 2, Ireland.
Nanotechnology
|March 6, 2014
Summary
This study reveals how atomic structure influences graphene synthesis on silicon carbide (SiC). Understanding this relationship is key for optimizing large-scale graphene production on SiC wafers.
Area of Science:
- Materials Science
- Surface Science
- Nanotechnology
Background:
- Graphene synthesis on silicon carbide (SiC) is crucial for electronic applications.
- Controlling the atomic structure of the SiC surface is vital for uniform graphene growth.
- Previous studies have explored graphene on SiC, but domain structure control remains a challenge.
Purpose of the Study:
- To investigate the atomic structure of the cubic-SiC(001) surface during graphene synthesis.
- To understand the relationship between the SiC surface reconstruction and the resulting graphene domain network.
- To provide insights for optimizing large-area graphene synthesis on SiC.
Main Methods:
- Utilizing scanning tunneling microscopy (STM) for atomic resolution imaging.
- Employing low-energy electron diffraction (LEED) to analyze surface structure and ordering.
- Correlating surface reconstruction with graphene domain boundary formation.
Main Results:
- Confirmed the synthesis of uniform, millimeter-scale graphene overlayers.
- Identified nanodomains rotated by ±13.5° relative to specific boundaries.
- Established that domain boundary directions align with carbon atomic chains on the SiC(001)-c(2 × 2) reconstruction.
- Demonstrated a correlation between SiC surface atomic structure and the graphene domain network.
Conclusions:
- The atomic structure of the SiC(001)-c(2 × 2) reconstruction dictates the formation of rotated graphene domains.
- This understanding enables optimization of large-area graphene synthesis on SiC.
- Facilitates the use of cost-effective cubic-SiC(001)/Si(001) wafers for graphene production.
Related Concept Videos
02:18Network Covalent Solids
12.9K
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...
12.9K
01:24Sequence Networks of Rotating Machines
592
A Y-connected synchronous generator, grounded through a neutral impedance, is designed to produce balanced internal phase voltages with only positive-sequence components. The generator's sequence networks include a source voltage that is exclusively in the positive-sequence network. The sequence components of line-to-ground voltages at the generator terminals illustrate this configuration.
Zero-sequence current induces a voltage drop across the generator's neutral impedance and other...
Zero-sequence current induces a voltage drop across the generator's neutral impedance and other...
592
02:06Newman Projections
16.9K
Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as...
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as...
16.9K
02:42Valence Bond Theory
8.9K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.9K
01:07Radicals: Electronic Structure and Geometry
4.1K
This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
4.1K