Related Experiment Video
Updated: May 27, 2026
11:24
Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices
Published on: July 11, 2025
Towards hybrid superlattices in graphene
Zhengzong Sun1, Cary L Pint, Daniela C Marcano
1Department of Chemistry, Houston, Texas 77005, USA.
Nature Communications
|December 1, 2011
Summary
Researchers created patterned graphane/graphene superlattices on a single graphene sheet. This controllable functionalization allows for precise spatial and density control of chemical modifications, paving the way for advanced graphene devices.
Area of Science:
- Materials Science
- Nanotechnology
- Chemistry
Background:
- Graphene's optical and electronic properties can be tuned via chemical functionalization.
- Controllable and reversible modification of graphene is key for advanced applications.
Purpose of the Study:
- To demonstrate controlled patterning of graphane/graphene superlattices on a single graphene sheet.
- To achieve spatial and density control over chemical functionalization of graphene.
Main Methods:
- Fabrication of graphane/graphene superlattices by exchanging sp(3) C-H bonds with sp(3) C-C bonds.
- Visualization of patterns using fluorescence quenching microscopy.
- Confirmation of patterns using Raman spectroscopy.
Main Results:
- Successful fabrication of multifunctional superlattices on macroscopic and microscopic scales.
- Controlled functionalization density ranging from 0.4% to 3.5% sp(3) C groups.
- Demonstrated spatial control over functional group placement on graphene's basal plane.
Conclusions:
- The developed two-step method enables precise control over graphene functionalization.
- This technique offers a route to multifunctional electrical circuits and chemical sensors.
- Potential for realizing advanced graphene-based devices with tailored recognition sites.
Related Concept Videos
03:35Hybridization of Atomic Orbitals II
sp3d and sp3d 2 Hybridization
03:24Hybridization of Atomic Orbitals I
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
02:38Valence Bond Theory and Hybridized Orbitals
According to valence bond theory, a covalent bond results when: (1) an orbital on one atom overlaps an orbital on a second atom, and (2) the single electrons in each orbital combine to form an electron pair. The strength of a covalent bond depends on the extent of overlap of the orbitals involved. Maximum overlap is possible when the orbitals overlap on a direct line between the two nuclei.
A σ bond (single bond in a Lewis structure) is a covalent bond in which the electron density is...
A σ bond (single bond in a Lewis structure) is a covalent bond in which the electron density is...
02:18Network Covalent Solids
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...
02:42Valence Bond Theory
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...