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Graphene

Graphene. Boris Torres MEEN 3344 Material Science. Graphene. Graphene is a one-atom-thick planar sheet of carbon atoms that are densely packed in a honeycomb crystal lattice. Graphite itself consists of many graphene sheets stacked together.

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Graphene

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  1. Graphene Boris Torres MEEN 3344 Material Science

  2. Graphene • Graphene is a one-atom-thick planar sheet of carbon atoms that are densely packed in a honeycomb crystal lattice. • Graphite itself consists of many graphene sheets stacked together. • The carbon-carbon bond length in graphene is approximately 0.142 nm.

  3. Graphene production • Graphene sheets in solid form (e.g. density > 1g/cc) is presently one of the most expensive materials on Earth. • Researchers obtained relatively large graphene sheets (eventually, up to 100 micrometers in size and visible through a magnifying glass) by mechanical exfoliation (repeated peeling) of 3D graphite crystals. • Another method is to heat silicon carbide to high temperatures (1100°C) to reduce it to graphene.

  4. Properties of Graphene • The resistivity of the graphene sheet is 10^−6 Ω·cm, less than the resistivity of silver, the lowest resistivity substance known at room temperature. • Graphene is the strongest substance known to man. Its Young's modulus is 0.5 TPa, which differs from bulk graphite. • These intrinsic properties could lead to the possibility of utilizing Graphene for NEM systems applications such as pressure sensors, and resonators.

  5. Properties of Graphene • Engineering professors at Columbia University tested graphene's strength at an atomic level by indenting a perfect sample of the material with a sharp probe made of diamond. • Electrons move through graphene with almost no resistance, generating little heat. What's more, graphene is itself a good thermal conductor, allowing heat to dissipate quickly.

  6. By oxidizing graphene flakes, and then floating them in water, the graphene flakes form a single sheet and bond very powerfully called Graphene oxide paper. Applications: Membranes with controlled permeability Supercapacitors for energy applications. Graphene electronics could be useful for communications and imaging technologies that require ultrafast transistors. Graphene and Applications

  7. References • Graphene http://en.wikipedia.org/wiki/Grapheneaccessed on March, 29 2009 • Graphene Confirmed the World’s Stronged Known Material http://gizmodo.com/5026404/graphene-confirmed-as-the-worlds-strongest-known-material accessed on March, 29 2009 • Nanotechnology Reserchers go Ballistic Over Graphene http://www.nanowerk.com/spotlight/spotid=2340.php accessed on March 29, 2009 • TR10: Graphene Transistors http://www.technologyreview.com/read_article.aspx?ch=specialsections&sc=emerging08&id=20242 accessed on March 29, 2009 • Graphene: Charged Up http://www.natureasia.com/asia-materials/highlight.php?id=77 accessed on March 29, 2009

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