Title: Graphene 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 gt 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 (1100C) to reduce it to graphene.

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4 Properties of Graphene • The resistivity of the graphene sheet is 10-6 Ocm, 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. Download Software Program Instalare Camera Web Gembird.

• 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 Graphene and Applications • 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. International Management Helen Deresky 8th Edition Pdf more.

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