METHOD FOR PREPARING LARGE GRAPHENE SHEETS IN LARGE SCALE

Claims

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

4 independent · 5 dependent

1
Independentgraphite powdersacidoxidantHCl (dilute)
A method for preparing large graphene sheets in large sca le, comprising s te ps of: under a mild condition, processing graphite powders w ith inter c alation th r oug h an a cid and a n oxidant, w h erein a radi al sh eet size of the graphite powders is 300-500 p m; washing away metal ions and inorganic ions in the graphite powders with dilute hydrochloric acid, then ﬁltering and drying; and, after a heat treatment, obtaining the large graphene sheet s, w herein a te mpe rat u re of the heat treatment is 500- 1, 350 "C, and a radial scale of the large graphene sheets is distributed from 20 p m to 200 jim. Currently amended
1. 2
  Dependent← claim 1H₂SO₄HNO₃H₃PO₄HClO₄
  C laim 2: T h e method for prep ar ing the lag e graphene s h eets in lage sca le, as recited in claim 1, wherein the aci d comprises at least one member selected from a group consisting of concentrated sulphuric acid, concentrated nitric acid, phosphoric acid an d perchloric acid. Original
2. 3
  Dependent← claim 1KMnO₄KClO₃NaClO₃K₂S₂O₈K₂Cr₂O₇
  The method for preparing the lage g raphene sheets in la rge sca le, as recited in claim 1, wherein the oxidant comprises at least one member selected from a group consisting of potassium pe r manganate, potassium chlo r ate, sodi u m chlorate, potassium pe rsuil fate and pota s sium dichromate. Original
3. 4
  Dependent← claim 1CCC
  The method for preparing the la rg e graphene sheets in la rge scale, as recited in claim 1, wherein the graphite powders comprise at least one member selected from a group c onsisting of natural ﬂa k e graphite powde r s, exp andabl e graphite powders and expanded graphite powders. Original
4. 5
  Dependent← claim 1acidoxidant
  The method for preparing the large g raphene sheets in large scale, as recited in claim 1, wherein an appropriate acid amount for each gram of the graphite powders is 20-60 m l and an appropriate oxidant amount for each g r am of the 2 graphite powders is 5 -1 0 g. Original
5. 6
  Dependent← claim 1HCl (dilute)
  The method for preparing the large graphene sheets in large sc ale, as recited in claim 1, whe rein an app r opriate amount of the dilute hydrochloric acid for e a ch gram of the graphite powders is 150-350 ml an d a volume percentage concentration of the dilute hydrochloric acid is 0.5-10%. Original
7
Independent
Claims 7-11. Canceled
11
Independent
Canceled
12
Independentgraphite powdersacidoxidantHCl (dilute)H₂SO₄HNO₃
C laim 12 (p r eviously presented): A method for preparing lar ge graphene sheets in large sc a le, co m pri s ing steps of: u nder a mild condition, processing gr a phite powders with intercalation through an acid and an oxidant; washing away metal ions and inorganic ions in the grap h ite powders wit h dilute hydrochloric acid, then ﬁltering a nd drying; and, after a heat treatment, obtaining the large graphene sheets; wherein: the acid comprises at le ast one member selected from a gro u p consisting of concentrated sulphuric acid, concentrated nitric acid, phosphoric acid and perchloric acid; the oxid a nt comprises at least one member selected from a gro u p consisting of potassium pe rm anganate, potassium chlorate, sodium chlorate, potassi umn pers uil fate and potassium dichromate; the graphite powders comprise at least one member selected from a group consis tin g of natural ﬂa ke graphite powders, expandable graphite powders and expanded graphite powders; a radial sheet size of the graphite powders is 300-500 um; an appropriate acid amount for each gram of the graphite powders is 20-60 ml i1 and an appropriate oxi d ant amount for each gram of the graphite powders is 5-10 g; an appropriate amount of the dilute hydrochloric acid for each gram of the graphite powders is 1 50-350 inl and a volume pe r centage concentration of the dilute hydrochloric acid is 0.5-10%; a temperature of the heat treatment is 500- 1, 350 ' C; an d a radial scale of the large graphene sheets is distributed from 20 pt m to 200 pam. Previously presented

Worked examples

Embodiments described in the patent, grouped by the materials and process steps they use.

First preferred embodiment

description derived process summary

5 materials1 process step

Graphite powders intercalated with acid and oxidant under mild conditions, washed with dilute hydrochloric acid to remove metal and inorganic ions, filtered, dried, and subjected to heat treatment to obtain large graphene sheets. XRD, SEM, and TEM characterization performed.

Second preferred embodiment

description derived process summary

5 materials1 process step

Similar graphene preparation process with Raman spectroscopy characterization of graphene, graphite oxide, and graphite powders.

Materials

Materials described outside the worked examples.

concentrated sulphuric acid

H₂SO₄

Acid Intercalation Agent

concentrated nitric acid

HNO₃

Characterization

Measurements and analyses referenced in the patent, with their drawing references.

XRD

X-ray diffraction spectra of graphite, graphite oxide and graphene according to first preferred embodiment (Figure 2)

graphite powdersgraphite oxideC

Reported properties

Performance values and ranges asserted in the specification or claims.

Property	Value	Material
electrical conductivity of film formed by pump filtration of graphene dispersed in NMP	600	C

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