GRAPHENE NANO-SHEETS AND METHODS FOR MAKING THE SAME

Yiliang Wu

Patent

Atlas literature

Patent

US 8,734,683

GRAPHENE NANO-SHEETS AND METHODS FOR MAKING THE SAME

Yiliang Wu

Claims

Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.

5 independent · 10 dependent

1
Independentexpandable graphiteexpanded graphitegraphene nano-sheets
A method of making graphene nano-sheets, comp rising placing an expandable graphite within a chamber; applying vacuum to the chamber, such that a vacuum pressure in the chamber ranges from about 10- mbar to about 10- mbar in the chamber, applying an electric current to induction heat the expandable graphite within the chamber under the vacuum to form an expanded graphite; and exfoliating the expanded graphite in a solvent to form one or more graphene n ano-sheets dispersed in the solvent.
1. 2
  Dependent← claim 1expandable graphiteexpanded graphite
  The method of claim 1, further comprising expanding the expandable graphite by about 200 % to about 1000 % by volume within the chamber to form the expanded graphite. previously presented
2. 4
  Dependent← claim 1expandable graphite
  The method of claim 1, wherein the expandable graphite is heated to a temperature ranging from about 500 ' C to about 1100 'C. -2- SVG 13306540.10-24-2013.HN₆L₉VR₄PXXIFW3.CLM₁1013056.1.1196.117.2202.252.svg 0.45 3.353 Graph Black and white
3. 6
  Dependent← claim 1expandable graphiteintercalation agent
  The method of claim 1, wherein the expandable graphite comp ri ses an intercalation agent 7 The method of claim 6, wherein the intercalation agent is selected from the group consisting of halogens, alkali metals, sulfate, nitrate, acids, metal halides, and combinations thereof
3
Independent
canceled
8
Independentexpandable graphiteexpanded graphitegraphene nano-sheetsintercalation agent
A method of making a graphene product comp ri sing: placing expandable graphite within a chamber, the expandable graphite comprising an intercalation agent capable of producing thermal expansion; applying vacuum to the chamber, wherein a vacuum pressure ranges from about 10' mbar to about 10- mbar in the chamber; applying an electric current to induction heat the expandable graphite under the vacuum to form expanded graphite; and exfoliating the expanded graphite in a solvent to form one or more graphene nano-sheets dispersed in the solvent. -3-SVG 13306540.10-24-2013.HN₆L₉VR₄PXXIFW3.CLM₁1013057.1.1228.133.2235.269.svg 0.453 3.357 Graph Black and white previously presented
1. 10
  Dependent← claim 8expandable graphite
  The method of claim 8, wherein the electric current is applied to reach a heating temperature ranging from 500 o C to about 1100 'C.
2. 11
  Dependent← claim 8graphene nano-sheets
  (O ri ginal) The method of claim 8, wherein each of the one or more graphene nano-sheets is formed to have an average thickness ranging from about 0.3 nm to about 15 nm. 12 The method of claim 8, wherein the one or more graphene nano-sheets are substantially free of impurity species comprising S, N, C l, 0 atoms, or their combinations. 13, The method of claim 8, wherein the one or more graphene nano-sheets comprise carbon of at least about 99 % by weight.
3. 14
  Dependent← claim 8expanded graphitegraphene nano-sheetssolvent
  The method of claim 8, wherein the step of exfoliating the expanded graphite comprises sonicating the expanded graphite to form the one or more graphene nano-sheets in the solvent, 15 The method of claim 8, wherein the solvent comprises toluene, chlorotoluene, chlorobenzene, dich l orobenzene, xylene, m esitylene, chloroethane, -4- SVG 13306540.10-24-2013.HN₆L₉VR₄PXXIFW3.CLM₁1013058.1.1219.122.2224.259.svg 0.457 3.35 Graph Black and white chloromethane, dimethylformamide (DMF), N-Methyl-2-pyrro li done (NMP), or combinations thereof,
4. 16
  Dependent← claim 8expanded graphitegraphene nano-sheetsconjugated polymerpolythiophene
  The method of claim 8, wherein the step of exfoliating the expanded graphite is carried out in a presence of a conjugated polymer. 17 The method of claim 16, wherein the conjugated polymer comprises a po l ythiophene.
9
Independent
canceled
20
Independent
canceled

Device structures

Layer stacks claimed or described, ordered top of device to substrate.

graphene-containing composite film

graphene nano-sheetsfiller

conjugated polymermatrix

Materials

Materials described outside the worked examples.

expandable graphite

Starting Material

expanded graphite

Intermediate

Process steps

Additional fabrication and treatment steps described in the patent.

Induction Heating Exfoliation

Step 1

Temperature

500, 1100°C

Ambient

vacuum

Reported properties

Performance values and ranges asserted in the specification or claims.

Property	Value	Material
Composition Carbon Content	≥99 wt%	graphene nano-sheets
Thickness	0.3–15 nm

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