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  2. Carbon group - Wikipedia

    en.wikipedia.org/wiki/Carbon_group

    Another allotrope of carbon is a fullerene, which has the form of sheets of carbon atoms folded into a sphere. A fifth allotrope of carbon, discovered in 2003, is called graphene, and is in the form of a layer of carbon atoms arranged in a honeycomb-shaped formation. [6] [14] [15] Silicon has two known allotropes that exist at room temperature.

  3. Graphene - Wikipedia

    en.wikipedia.org/wiki/Graphene

    It is an allotrope of carbon in the form of a plane of sp 2-bonded atoms with a molecular bond length of 0.142 nm (1.42 Å). In a graphene sheet, each atom is connected to its three nearest carbon neighbors by σ-bonds , and a delocalized π-bond , which contributes to a valence band that extends over the whole sheet.

  4. Bilayer graphene - Wikipedia

    en.wikipedia.org/wiki/Bilayer_graphene

    The carbon atoms accumulate in the mesopores, forming protuberances that act as spacers to prevent stacking. The protuberance density is approximately 5.8 × 10 14 m −2. Graphene is deposited on both sides of the flakes. [30] During CVD synthesis the protuberances produce intrinsically unstacked double-layer graphene after the removal of the ...

  5. Allotropes of carbon - Wikipedia

    en.wikipedia.org/wiki/Allotropes_of_carbon

    In graphite, each carbon atom uses only 3 of its 4 outer energy level electrons in covalently bonding to three other carbon atoms in a plane. Each carbon atom contributes one electron to a delocalized system of electrons that is also a part of the chemical bonding. The delocalized electrons are free to move throughout the plane. For this reason ...

  6. Ottoman (furniture) - Wikipedia

    en.wikipedia.org/wiki/Ottoman_(furniture)

    An ottoman is a piece of furniture. [1] Generally, ottomans have neither backs nor arms. They may be an upholstered low couch or a smaller cushioned seat used as a table, stool or footstool. The seat may have hinges and a lid for the inside hollow, which can be used for storing linen, magazines, or other items, making it a form of storage ...

  7. Graphene production techniques - Wikipedia

    en.wikipedia.org/wiki/Graphene_production_techniques

    The growth automatically stops after a single layer forms. Arbitrarily large films can be created. [74] [83] The single layer growth is due to the low concentration of carbon in methane. The process is surface-based rather than relying on absorption into the metal and then diffusion of carbon into graphene layers on the surface. [84]

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