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Thread: Graphene Coating for the DIY'er

  1. #21
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 408
    I'm Sandro.

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    Copy and paste from wikypedia

    Electron transport[edit]


    Graphene displays remarkable electron mobility at room temperature, with reported values in excess of 15000 cm2⋅V−1⋅s−1.[37] Hole and electron mobilities were expected to be nearly identical.[78] The mobility is nearly independent of temperature between 10 K and 100 K,[28][83][84] which implies that the dominant scattering mechanism is defect scattering. Scattering by graphene's acoustic phonons intrinsically limits room temperature mobility to 200000 cm2⋅V−1⋅s−1 at a carrier density of 1012 cm−2,[84][85] 10×106 times greater than copper.[86]
    The corresponding resistivity of graphene sheets would be 10−6 Ω⋅cm. This is less than the resistivity of silver, the lowest otherwise known at room temperature.[87] However, on SiO

    2
    substrates, scattering of electrons by optical phonons of the substrate is a larger effect than scattering by graphene's own phonons. This limits mobility to 40000 cm2⋅V−1⋅s−1.[84]



    Bit I understand is 10 X 10 at the six so a 10 whit 6 zeroes after greater than copper
    and 10-6 less than the resistivity of Silver

    But it is a single layer mono atomic element How one work whit it?

    I don'
    t have a hammer small enough


  2. #22
    Join Date: Jan 2009

    Location: Essex

    Posts: 21,420
    I'm openingabottleofwine.

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    The resistivity of annealed copper at room temperature is 1.72 10-6 Ohm.cm. For silver, it is 1.69 10-6 Ohm.cm.

    I find it hard to believe that coating a copper wire with a monoatomic layer of carbon would improve the conductivity, but I am open to persuasion.
    Last edited by Barry; 02-12-2019 at 01:20. Reason: correction to notation
    Barry

  3. #23
    Join Date: Jan 2009

    Location: Sheffield - UK

    Posts: 6,714
    I'm Mark.

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    I will now leave this ‘discussion’, but rather than repeating myself I will quote from the last linked article:

    However, there are still challenges to face for grapheneapplications in metal composites, due to reasons including anagglomeration tendency in liquids, and poor wettabilitybetween graphene and metal, which cause difficulties in thepreparation of high performance metal/graphene composites.Therefore, up to now, there are few works on metal/graphenecomposites and complex preparation methods with low costs.Electrochemical deposition22and laser physical vapordeposition23have been proven capable of realizing uniformdispersion of reduced graphene oxide (RGO) in a metal matrixfor preparation of metal/graphene composite lms. Z. Li et al.24successfully prepared aluminum/RGO composites and foundthat a composite reinforced with only 0.3 wt% of RGO showedan 18 and 17% increase in the elastic modulus and hardness,respectively. They rstly achieved uniform distribution of RGOin an Al matrix via simple electrostatic interaction betweengraphene oxide (GO) and Al akes, and a densied RGO/Alcomposite was obtained by hot pressing the RGO/Alcomposite powders.

    100% Analogue

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