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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 Monolayer Graphene-Coated Grids for Cryoelectron Microscopy
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Published on: September 8, 2023

Graphene on insulating crystalline substrates.

S Akcöltekin1, M El Kharrazi, B Köhler

  • 1Fachbereich Physik, CeNIDE, Universität Duisburg-Essen, D-47048 Duisburg, Germany.

Nanotechnology
|May 8, 2009
PubMed
Summary
This summary is machine-generated.

Researchers successfully prepared and identified ultra-thin graphene sheets on various crystalline substrates using standard methods. This finding expands the potential applications of graphene in advanced materials and electronics.

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

Published on: September 23, 2018

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Graphene, a single layer of carbon atoms, has unique electronic and mechanical properties.
  • Identifying and preparing graphene on different substrates is crucial for its technological applications.
  • Conventional substrates like SiO(2) are widely used, but exploring new crystalline substrates is essential.

Purpose of the Study:

  • To investigate the preparation and identification of ultra-thin graphene sheets on crystalline substrates.
  • To compare graphene flake distribution on new substrates with conventional ones.
  • To determine the optical contrast and physical height of graphene layers on these substrates.

Main Methods:

  • Mechanical exfoliation for graphene preparation.
  • Optical microscopy and atomic force microscopy (AFM) for identification and characterization.
  • Calculation of optical properties for determining contrast.

Main Results:

  • Successful preparation and identification of single-, bi-, and few-layer graphene on SrTiO(3), TiO(2), Al(2)O(3), and CaF(2).
  • Similar flake distribution observed compared to SiO(2) substrates.
  • Optical contrast values ranged from -1.5% (G/TiO(2)) to -8.8% (G/CaF(2)), enabling optical microscope identification.
  • Single-layer graphene height measured at 0.34 nm on crystalline substrates, significantly less than on SiO(2).

Conclusions:

  • Standard techniques are effective for preparing and identifying graphene on various crystalline substrates.
  • The optical contrast and reduced physical height are suitable for practical applications.
  • These crystalline substrates offer a viable alternative to conventional SiO(2) for graphene research and development.