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Related Concept Videos

Network Covalent Solids02:18

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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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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Polycrystalline graphene and other two-dimensional materials.

Oleg V Yazyev1, Yong P Chen2

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Polycrystalline graphene, essential for industrial uses, features grain boundaries impacting its properties. This review covers polycrystalline graphene

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Graphene, a single atomic layer of carbon, exhibits exceptional properties for diverse technological applications.
  • Large-area graphene films for industry are typically polycrystalline, consisting of single-crystalline grains with varying orientations connected by grain boundaries.

Purpose of the Study:

  • To review recent research on polycrystalline graphene.
  • To discuss the growth, structure, properties, and applications of polycrystalline graphene.

Main Methods:

  • Literature review of research on polycrystalline graphene.
  • Analysis of grain boundary structure, electronic transport, optical, and mechanical properties.
  • Discussion of topological defects and applications.

Main Results:

  • Grain boundaries significantly influence the electronic, optical, and mechanical properties of polycrystalline graphene.
  • Understanding grain boundaries is crucial for optimizing graphene's performance in various applications.
  • Research on other 2D materials like transition metal dichalcogenides is also considered.

Conclusions:

  • Polycrystalline graphene is a promising material for industrial applications due to its unique properties.
  • Further research into grain boundary engineering can unlock advanced applications.
  • Future directions include exploring other 2D materials and refining characterization techniques.