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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.
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...

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Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding
14:52

Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding

Published on: September 23, 2018

How perfect can graphene be?

P Neugebauer1, M Orlita, C Faugeras

  • 1Grenoble High Magnetic Field Laboratory, CNRS, BP 166, F-38042 Grenoble Cedex 09, France.

Physical Review Letters
|November 13, 2009
PubMed
Summary
This summary is machine-generated.

Researchers discovered ultra-pure graphene with record-breaking carrier mobility exceeding 10^7 cm^2/(V*s). This natural graphene offers superior electronic quality, challenging current graphene technologies.

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Published on: July 24, 2015

Preparation of Carbon Nanosheets at Room Temperature
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Preparation of Carbon Nanosheets at Room Temperature

Published on: March 8, 2016

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Last Updated: Jun 18, 2026

Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding
14:52

Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding

Published on: September 23, 2018

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
11:42

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Published on: July 24, 2015

Preparation of Carbon Nanosheets at Room Temperature
10:44

Preparation of Carbon Nanosheets at Room Temperature

Published on: March 8, 2016

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Graphene, a single layer of carbon atoms, exhibits remarkable electronic properties.
  • Achieving high-quality graphene with intrinsic properties has been a significant challenge.
  • Natural graphene sourced from bulk graphite offers a unique material for investigation.

Purpose of the Study:

  • To investigate the electronic properties of the purest natural graphene.
  • To determine the carrier mobility and scattering time of ultralow density graphene layers.
  • To assess the potential of this high-quality graphene for future technologies.

Main Methods:

  • Cyclotron resonance spectroscopy in the Terahertz (THz) range.
  • Landau level spectroscopy at very low magnetic fields.
  • Characterization of naturally occurring decoupled graphene layers from bulk graphite.

Main Results:

  • Identified cyclotron resonance in exceptionally pure graphene.
  • Demonstrated ultralow carrier density (n₀ ≈ 3 x 10^9 cm⁻²).
  • Achieved carrier mobility > 10^7 cm²/(V·s) and scattering time τ ≈ 20 ps.

Conclusions:

  • The investigated natural graphene exhibits superior intrinsic electronic properties.
  • These findings set new benchmarks for graphene quality.
  • The results present a significant challenge and opportunity for advancing graphene-based technologies.