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Method of producing nano-scaled graphene and inorganic platelets and their nanocomposites

  • US 8,114,373 B2
  • Filed: 01/04/2011
  • Issued: 02/14/2012
  • Est. Priority Date: 02/22/2007
  • Status: Active Grant
First Claim
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1. A method of exfoliating a layered material to produce nano-scaled platelets having a thickness smaller than 100 nm, said method comprising:

  • a) subjecting said layered material to a halogen vapor at a first temperature between the melting point or sublimation point of said halogen with a halogen vapor pressure and for a duration of time sufficient to cause said halogen to penetrate an interlayer space of said layered material for forming a stable halogen-intercalated compound, wherein said layered material comprises a layered inorganic compound selected from the group consisting of (a) clay;

    (b) bismuth selenide or telluride;

    (c) transition metal dichalcogenide;

    (d) sulfide, selenide, and telluride of niobium, molybdenum, hafnium, tantalum, tungsten, and rhenium;

    (e) layered transition metal oxide;

    (f) pre-intercalated compounds, and combinations thereof; and

    wherein said halogen is selected from the group consisting of iodine bromide, bromine chloride, iodine pentafluoride, bromine trifluoride, chlorine trifluoride, phosphorus trichloride, phosphorus tetrachloride, phosphorus tribromide, phosphorus triiodide or a combination thereof, or in combinations with a diatomic halogen selected from the group consisting of bromine or iodine andb) mixing said halogen-intercalated compound in a liquid medium which is subjected to ultrasonication for exfoliating said intercalated compound to produce the platelets and for dispersing said platelets in said liquid medium.

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