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Related Concept Videos

Network Covalent Solids02:18

Network 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.
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Related Experiment Video

Updated: Jun 13, 2026

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
15:47

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Published on: November 1, 2013

Vacancy clusters in graphane as quantum dots.

Abhishek K Singh1, Evgeni S Penev, Boris I Yakobson

  • 1Department of Mechanical Engineering and Materials Science and Department of Chemistry, Rice University, Houston, Texas 77005, USA.

ACS Nano
|May 15, 2010
PubMed
Summary

Graphane hosts graphene quantum dots with tunable properties. These nanostructures, with formation energies and band gaps inversely proportional to size, show promise for advanced two-dimensional nanoelectronics.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanoscience

Background:

  • Graphene and graphane exhibit complementary electronic properties.
  • Sharp interfaces between graphene and graphane are crucial for nanoelectronic applications.

Purpose of the Study:

  • Investigate graphane as a host for graphene quantum dots.
  • Determine the factors governing the size, shape, and stability of these quantum dots.
  • Analyze the electronic properties, specifically band gaps, of graphene quantum dots within graphane.

Main Methods:

  • Utilized first-principles density functional theory (DFT) calculations.
  • Employed tight-binding calculations for electronic structure analysis.

Main Results:

  • Graphane naturally accommodates graphene quantum dots (clusters of vacancies).
  • Formation energies scale as approximately 1/sqrt(n) eV/atom, favoring hexagonal clusters.
  • Quantum dots exhibit band gaps of approximately 15/sqrt(n) eV, dependent on size.
  • Size dependence aligns with theoretical models for confined Dirac fermions.

Conclusions:

  • Graphane is a suitable host for creating tunable graphene quantum dots.
  • The electronic properties of these quantum dots are controllable via size and shape.
  • These findings support the development of novel two-dimensional nanoelectronic devices.