Patent
US 10,131,803of Invention
Kwon Nam Sohn
US
Copyright © 2026 Matter42. All rights reserved.
Patent
Atlas literature
Patent
US 10,131,803Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1 is an outlined schematic view showing a principle of high pressure homogenizer usable in a preparation method of graphene of an exemplary embodiment. …
FIGS. 2A and 2B (enlarged views in a range of molecular weight of 400 to 500) are drawings showing molecular weight distribution of pitch used for preparation …
FIGS. 3A and 3B (enlarged views in a range of molecular weight of 400 to 500) are drawings showing molecular weight distribution of a dispersant obtained in …
FIG. 4 is a drawing showing the analysis results, after analyzing pitch and a dispersant of Preparation Example 1 by a 13 C C PMAS NMR, respectively.
FIG. 5 is a drawing showing the analysis results, after analyzing pitch 7 and a dispersant of Preparation Example 1 by a F T-IR, respectively.
FIG. 6 is a drawing showing comparison of the analysis results, after analyzing molecular weight distributions of dispersants each of which is obtained in …
FIG. 7 is a micrograph of graphite used as a raw material for preparation of graphene flakes of the Examples (a), and micrographs of graphene flakes each of …
FIG. 8 shows TEM analysis results (a and b), and AFM analysis results (c and d), for measuring a diameter and a thickness of a graphene flake of Example 4, …
FIGS. 9 and 10 are micrographs of graphene flakes each of which is prepared in Comparative Examples 1 and 2.
FIG. 10, it was confirmed that in case of using the dispersant of Comparative preparation Example 2 also, the exfoliating of the graphite was not performed …
FIG. 11 is a visually observed photograph showing evaluation results of redispersibility by redispersing graphene flakes obtained in Example 4 in various …
FIG. 12 is a visually observed photograph showing evaluation results of redispersibility by redispersing graphene flakes obtained in Comparative Example 1 in …
FIG. 13 is a graph showing measurement results of sheet resistance of a graphene film, after preparing the graphene film using graphene flakes of Example 4, in …
FIG. 14 is a drawing showing measurement results of sheet resistance of a film with appearance of the formed film, after preparing a paste 8 composition using …
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A preparation method of graphene, the preparation method comp ri sing: applying a physical force to dispersion of a carbon-based material including graphite or a derivative thereof, and a dispersant, wherein the dispersant includes a mixture of plural kinds of polyaromatic hydrocarbon oxides, containing the polyaromatic hydrocarbon oxides having a molecular weight of 300 to 700 in a content of 6 070 % to 95% by weight wherein the dispersant has an oxy g en content of 12 to 50% by wei g ht, based on total element content, when the plural kinds of pol y aromatic hydrocarbon oxides contained in the dispersant are subjected to elemental analysis, and the graphite or the derivative thereof is formed into a graphene flake having a thickness in nanoscale under application of the physical force. Currently amended
The preparation method of claim 1, wherein the graphite or the derivative thereof is one or more selected from the group consisting of graphite, expanded graphite, indeterminate graphite, planar graphite, artificial graphite, modified graphite having an intercalation compound inserted in a carbon interlayer, and carbon nanofiber. Original
The preparation method of claim 1, wherein the dispersion is dispersion where the carbon-based material and the dispersant are dissolved or dispersed in an aqueous solvent or a polar organic solvent. Original
The preparation method of claim 1, wherein the polyaromatic hydrocarbon oxides contained in the dispersant have a structure where one or more oxygen-containing functional group are bonded to an aromatic hydrocarbon containing 5 to 30 benzene rings. Original
The preparation method of claim 1, wherein the applying of the physical force proceeds by a method using a high speed homogenizer, a high pressure homogenizer, a ball mill, a bead mill or an ultrasonic irradiator. Original
The preparation method of claim 1, wherein the graphene flake has a thickness of 1.5 to 50 nm. Original
The preparation method of claim 1, wherein the graphene flake has a diameter of 0.1 to 10 m, and a diameter/thickness ratio of 50 to 6000. Original
The preparation method of claim 1, wherein the graphene flake is formed in a state where the dispersant is physically attached to a surface of the graphene flake. Original
The preparation method of claim 1, further comprising recovering the graphene flakes from the dispersion of the graphene flakes, and drying the graphene flakes. Original
Canceled
A dispersed composition of graphene, the dispersed composition comprising: graphene flakes to a surface of which a dispersant including a mixture of plural kinds of polyaromatic hydrocarbon oxides, containing the polyaromatic hydrocarbon oxides having a molecular weight of 300 to 1000 in a content of 60% by weight or more, is physically attached; and a polar solvent dissolving or dispersing the graphene flakes. Withdrawn
The dispersed composition of claim 14, wherein it is prepared by forming the graphene flakes to the surface of which the dispersant is physically attached, and then dissolving or dispersing the graphene flakes in the polar solvent. Withdrawn
The dispersed composition of claim 14, wherein the polar solvent includes one or more selected from the group consisting of water, NMP, acetone, DMF, DMSO, ethanol, isopropyl alcohol, methanol, butanol, 2-ethoxy ethanol, 2-butoxy ethanol, 2-methoxy propanol, THF, ethylene glycol, pyridine, dimethylacetamide, N-vinyl pyrrolidone, methyl ethyl ketone, butanone, a -terpinol, formic acid, ethyl acetate and acrylonitrile. Withdrawn
The dispersed composition of claim 14, wherein the graphene flakes to the surface of which the dispersant is physically attached are contained in 50 parts by weight or less, based on 100 parts by weight of the polar solvent. Withdrawn
The dispersed composition of claim 14, wherein it is used as a conductive paste composition, a conductive ink composition, a composition for forming a heat dissipation substrate, an electrically conductive composite, a composite for EMI shielding, or a conductive material for a battery. Withdrawn
Embodiments described in the patent, grouped by the materials and process steps they use.
2 materials1 process step
Preparation of dispersant from petroleum pitch (POSCO) by oxidation in sulfuric acid/nitric acid (3:1 v/v) at 70°C for 3.5 hours, followed by cooling, dilution with distilled water, centrifugation at 3500 rpm for 30 minutes, redispersion, and collection/drying of precipitate. MALDI-TOF, 13C CPMAS NMR, and FT-IR analyses confirmed the presence of polyaromatic hydrocarbon oxides (MW 300-1000 or 300-700, ≥60 wt%) with oxygen-containing functional groups (epoxy, hydroxy, carboxy, -COOH, -OH, -SO₃H).
2 materials3 process steps
Dispersants prepared in the same manner as Preparation Example 1 using a different pitch sample from POSCO, with oxidation reaction times of 1 hour (Prep. Ex. 2), 3.5 hours (Prep. Ex. 3), and 7 hours (Prep. Ex. 4). MALDI-TOF analysis showed that longer oxidation times reduce the content of components with MW >1000 (or >700), yielding dispersants enriched in polyaromatic hydrocarbon oxides with MW 300-1000 (or 300-700).
Materials described outside the worked examples.
graphite or derivative thereof
graphene flake
polar solvent
Measurements and analyses referenced in the patent, with their drawing references.
FIG. 8 shows TEM analysis results (a and b), and AFM analysis results (c and d), for measuring a diameter and a thickness of a graphene flake of Example 4, …
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Thickness Nm | 1.5–50 nm | graphene flake |
Diameter Um | 0.1–10 µm |
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STRUCTURE AND MANUFACTURING METHOD OF THE STRUCTURE, AND GALLIUM NITRIDE-BASED SEMICONDUCTOR LIGHT-EMITTING DEVICE USING THE STRUCTURE AND MANUFACTURING METHOD OF THE DEVICE
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Atlas literature
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US 10,131,803Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1 is an outlined schematic view showing a principle of high pressure homogenizer usable in a preparation method of graphene of an exemplary embodiment. …
FIGS. 2A and 2B (enlarged views in a range of molecular weight of 400 to 500) are drawings showing molecular weight distribution of pitch used for preparation …
FIGS. 3A and 3B (enlarged views in a range of molecular weight of 400 to 500) are drawings showing molecular weight distribution of a dispersant obtained in …
FIG. 4 is a drawing showing the analysis results, after analyzing pitch and a dispersant of Preparation Example 1 by a 13 C C PMAS NMR, respectively.
FIG. 5 is a drawing showing the analysis results, after analyzing pitch 7 and a dispersant of Preparation Example 1 by a F T-IR, respectively.
FIG. 6 is a drawing showing comparison of the analysis results, after analyzing molecular weight distributions of dispersants each of which is obtained in …
FIG. 7 is a micrograph of graphite used as a raw material for preparation of graphene flakes of the Examples (a), and micrographs of graphene flakes each of …
FIG. 8 shows TEM analysis results (a and b), and AFM analysis results (c and d), for measuring a diameter and a thickness of a graphene flake of Example 4, …
FIGS. 9 and 10 are micrographs of graphene flakes each of which is prepared in Comparative Examples 1 and 2.
FIG. 10, it was confirmed that in case of using the dispersant of Comparative preparation Example 2 also, the exfoliating of the graphite was not performed …
FIG. 11 is a visually observed photograph showing evaluation results of redispersibility by redispersing graphene flakes obtained in Example 4 in various …
FIG. 12 is a visually observed photograph showing evaluation results of redispersibility by redispersing graphene flakes obtained in Comparative Example 1 in …
FIG. 13 is a graph showing measurement results of sheet resistance of a graphene film, after preparing the graphene film using graphene flakes of Example 4, in …
FIG. 14 is a drawing showing measurement results of sheet resistance of a film with appearance of the formed film, after preparing a paste 8 composition using …
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A preparation method of graphene, the preparation method comp ri sing: applying a physical force to dispersion of a carbon-based material including graphite or a derivative thereof, and a dispersant, wherein the dispersant includes a mixture of plural kinds of polyaromatic hydrocarbon oxides, containing the polyaromatic hydrocarbon oxides having a molecular weight of 300 to 700 in a content of 6 070 % to 95% by weight wherein the dispersant has an oxy g en content of 12 to 50% by wei g ht, based on total element content, when the plural kinds of pol y aromatic hydrocarbon oxides contained in the dispersant are subjected to elemental analysis, and the graphite or the derivative thereof is formed into a graphene flake having a thickness in nanoscale under application of the physical force. Currently amended
The preparation method of claim 1, wherein the graphite or the derivative thereof is one or more selected from the group consisting of graphite, expanded graphite, indeterminate graphite, planar graphite, artificial graphite, modified graphite having an intercalation compound inserted in a carbon interlayer, and carbon nanofiber. Original
The preparation method of claim 1, wherein the dispersion is dispersion where the carbon-based material and the dispersant are dissolved or dispersed in an aqueous solvent or a polar organic solvent. Original
The preparation method of claim 1, wherein the polyaromatic hydrocarbon oxides contained in the dispersant have a structure where one or more oxygen-containing functional group are bonded to an aromatic hydrocarbon containing 5 to 30 benzene rings. Original
The preparation method of claim 1, wherein the applying of the physical force proceeds by a method using a high speed homogenizer, a high pressure homogenizer, a ball mill, a bead mill or an ultrasonic irradiator. Original
The preparation method of claim 1, wherein the graphene flake has a thickness of 1.5 to 50 nm. Original
The preparation method of claim 1, wherein the graphene flake has a diameter of 0.1 to 10 m, and a diameter/thickness ratio of 50 to 6000. Original
The preparation method of claim 1, wherein the graphene flake is formed in a state where the dispersant is physically attached to a surface of the graphene flake. Original
The preparation method of claim 1, further comprising recovering the graphene flakes from the dispersion of the graphene flakes, and drying the graphene flakes. Original
Canceled
A dispersed composition of graphene, the dispersed composition comprising: graphene flakes to a surface of which a dispersant including a mixture of plural kinds of polyaromatic hydrocarbon oxides, containing the polyaromatic hydrocarbon oxides having a molecular weight of 300 to 1000 in a content of 60% by weight or more, is physically attached; and a polar solvent dissolving or dispersing the graphene flakes. Withdrawn
The dispersed composition of claim 14, wherein it is prepared by forming the graphene flakes to the surface of which the dispersant is physically attached, and then dissolving or dispersing the graphene flakes in the polar solvent. Withdrawn
The dispersed composition of claim 14, wherein the polar solvent includes one or more selected from the group consisting of water, NMP, acetone, DMF, DMSO, ethanol, isopropyl alcohol, methanol, butanol, 2-ethoxy ethanol, 2-butoxy ethanol, 2-methoxy propanol, THF, ethylene glycol, pyridine, dimethylacetamide, N-vinyl pyrrolidone, methyl ethyl ketone, butanone, a -terpinol, formic acid, ethyl acetate and acrylonitrile. Withdrawn
The dispersed composition of claim 14, wherein the graphene flakes to the surface of which the dispersant is physically attached are contained in 50 parts by weight or less, based on 100 parts by weight of the polar solvent. Withdrawn
The dispersed composition of claim 14, wherein it is used as a conductive paste composition, a conductive ink composition, a composition for forming a heat dissipation substrate, an electrically conductive composite, a composite for EMI shielding, or a conductive material for a battery. Withdrawn
Embodiments described in the patent, grouped by the materials and process steps they use.
2 materials1 process step
Preparation of dispersant from petroleum pitch (POSCO) by oxidation in sulfuric acid/nitric acid (3:1 v/v) at 70°C for 3.5 hours, followed by cooling, dilution with distilled water, centrifugation at 3500 rpm for 30 minutes, redispersion, and collection/drying of precipitate. MALDI-TOF, 13C CPMAS NMR, and FT-IR analyses confirmed the presence of polyaromatic hydrocarbon oxides (MW 300-1000 or 300-700, ≥60 wt%) with oxygen-containing functional groups (epoxy, hydroxy, carboxy, -COOH, -OH, -SO₃H).
2 materials3 process steps
Dispersants prepared in the same manner as Preparation Example 1 using a different pitch sample from POSCO, with oxidation reaction times of 1 hour (Prep. Ex. 2), 3.5 hours (Prep. Ex. 3), and 7 hours (Prep. Ex. 4). MALDI-TOF analysis showed that longer oxidation times reduce the content of components with MW >1000 (or >700), yielding dispersants enriched in polyaromatic hydrocarbon oxides with MW 300-1000 (or 300-700).
Materials described outside the worked examples.
graphite or derivative thereof
graphene flake
polar solvent
Measurements and analyses referenced in the patent, with their drawing references.
FIG. 8 shows TEM analysis results (a and b), and AFM analysis results (c and d), for measuring a diameter and a thickness of a graphene flake of Example 4, …
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Thickness Nm | 1.5–50 nm | graphene flake |
Diameter Um | 0.1–10 µm |
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STRUCTURE AND MANUFACTURING METHOD OF THE STRUCTURE, AND GALLIUM NITRIDE-BASED SEMICONDUCTOR LIGHT-EMITTING DEVICE USING THE STRUCTURE AND MANUFACTURING METHOD OF THE DEVICE
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Atlas literature
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US 10,131,803Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1 is an outlined schematic view showing a principle of high pressure homogenizer usable in a preparation method of graphene of an exemplary embodiment. …
FIGS. 2A and 2B (enlarged views in a range of molecular weight of 400 to 500) are drawings showing molecular weight distribution of pitch used for preparation …
FIGS. 3A and 3B (enlarged views in a range of molecular weight of 400 to 500) are drawings showing molecular weight distribution of a dispersant obtained in …
FIG. 4 is a drawing showing the analysis results, after analyzing pitch and a dispersant of Preparation Example 1 by a 13 C C PMAS NMR, respectively.
FIG. 5 is a drawing showing the analysis results, after analyzing pitch 7 and a dispersant of Preparation Example 1 by a F T-IR, respectively.
FIG. 6 is a drawing showing comparison of the analysis results, after analyzing molecular weight distributions of dispersants each of which is obtained in …
FIG. 7 is a micrograph of graphite used as a raw material for preparation of graphene flakes of the Examples (a), and micrographs of graphene flakes each of …
FIG. 8 shows TEM analysis results (a and b), and AFM analysis results (c and d), for measuring a diameter and a thickness of a graphene flake of Example 4, …
FIGS. 9 and 10 are micrographs of graphene flakes each of which is prepared in Comparative Examples 1 and 2.
FIG. 10, it was confirmed that in case of using the dispersant of Comparative preparation Example 2 also, the exfoliating of the graphite was not performed …
FIG. 11 is a visually observed photograph showing evaluation results of redispersibility by redispersing graphene flakes obtained in Example 4 in various …
FIG. 12 is a visually observed photograph showing evaluation results of redispersibility by redispersing graphene flakes obtained in Comparative Example 1 in …
FIG. 13 is a graph showing measurement results of sheet resistance of a graphene film, after preparing the graphene film using graphene flakes of Example 4, in …
FIG. 14 is a drawing showing measurement results of sheet resistance of a film with appearance of the formed film, after preparing a paste 8 composition using …
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A preparation method of graphene, the preparation method comp ri sing: applying a physical force to dispersion of a carbon-based material including graphite or a derivative thereof, and a dispersant, wherein the dispersant includes a mixture of plural kinds of polyaromatic hydrocarbon oxides, containing the polyaromatic hydrocarbon oxides having a molecular weight of 300 to 700 in a content of 6 070 % to 95% by weight wherein the dispersant has an oxy g en content of 12 to 50% by wei g ht, based on total element content, when the plural kinds of pol y aromatic hydrocarbon oxides contained in the dispersant are subjected to elemental analysis, and the graphite or the derivative thereof is formed into a graphene flake having a thickness in nanoscale under application of the physical force. Currently amended
The preparation method of claim 1, wherein the graphite or the derivative thereof is one or more selected from the group consisting of graphite, expanded graphite, indeterminate graphite, planar graphite, artificial graphite, modified graphite having an intercalation compound inserted in a carbon interlayer, and carbon nanofiber. Original
The preparation method of claim 1, wherein the dispersion is dispersion where the carbon-based material and the dispersant are dissolved or dispersed in an aqueous solvent or a polar organic solvent. Original
The preparation method of claim 1, wherein the polyaromatic hydrocarbon oxides contained in the dispersant have a structure where one or more oxygen-containing functional group are bonded to an aromatic hydrocarbon containing 5 to 30 benzene rings. Original
The preparation method of claim 1, wherein the applying of the physical force proceeds by a method using a high speed homogenizer, a high pressure homogenizer, a ball mill, a bead mill or an ultrasonic irradiator. Original
The preparation method of claim 1, wherein the graphene flake has a thickness of 1.5 to 50 nm. Original
The preparation method of claim 1, wherein the graphene flake has a diameter of 0.1 to 10 m, and a diameter/thickness ratio of 50 to 6000. Original
The preparation method of claim 1, wherein the graphene flake is formed in a state where the dispersant is physically attached to a surface of the graphene flake. Original
The preparation method of claim 1, further comprising recovering the graphene flakes from the dispersion of the graphene flakes, and drying the graphene flakes. Original
Canceled
A dispersed composition of graphene, the dispersed composition comprising: graphene flakes to a surface of which a dispersant including a mixture of plural kinds of polyaromatic hydrocarbon oxides, containing the polyaromatic hydrocarbon oxides having a molecular weight of 300 to 1000 in a content of 60% by weight or more, is physically attached; and a polar solvent dissolving or dispersing the graphene flakes. Withdrawn
The dispersed composition of claim 14, wherein it is prepared by forming the graphene flakes to the surface of which the dispersant is physically attached, and then dissolving or dispersing the graphene flakes in the polar solvent. Withdrawn
The dispersed composition of claim 14, wherein the polar solvent includes one or more selected from the group consisting of water, NMP, acetone, DMF, DMSO, ethanol, isopropyl alcohol, methanol, butanol, 2-ethoxy ethanol, 2-butoxy ethanol, 2-methoxy propanol, THF, ethylene glycol, pyridine, dimethylacetamide, N-vinyl pyrrolidone, methyl ethyl ketone, butanone, a -terpinol, formic acid, ethyl acetate and acrylonitrile. Withdrawn
The dispersed composition of claim 14, wherein the graphene flakes to the surface of which the dispersant is physically attached are contained in 50 parts by weight or less, based on 100 parts by weight of the polar solvent. Withdrawn
The dispersed composition of claim 14, wherein it is used as a conductive paste composition, a conductive ink composition, a composition for forming a heat dissipation substrate, an electrically conductive composite, a composite for EMI shielding, or a conductive material for a battery. Withdrawn
Embodiments described in the patent, grouped by the materials and process steps they use.
2 materials1 process step
Preparation of dispersant from petroleum pitch (POSCO) by oxidation in sulfuric acid/nitric acid (3:1 v/v) at 70°C for 3.5 hours, followed by cooling, dilution with distilled water, centrifugation at 3500 rpm for 30 minutes, redispersion, and collection/drying of precipitate. MALDI-TOF, 13C CPMAS NMR, and FT-IR analyses confirmed the presence of polyaromatic hydrocarbon oxides (MW 300-1000 or 300-700, ≥60 wt%) with oxygen-containing functional groups (epoxy, hydroxy, carboxy, -COOH, -OH, -SO₃H).
2 materials3 process steps
Dispersants prepared in the same manner as Preparation Example 1 using a different pitch sample from POSCO, with oxidation reaction times of 1 hour (Prep. Ex. 2), 3.5 hours (Prep. Ex. 3), and 7 hours (Prep. Ex. 4). MALDI-TOF analysis showed that longer oxidation times reduce the content of components with MW >1000 (or >700), yielding dispersants enriched in polyaromatic hydrocarbon oxides with MW 300-1000 (or 300-700).
Materials described outside the worked examples.
graphite or derivative thereof
graphene flake
polar solvent
Measurements and analyses referenced in the patent, with their drawing references.
FIG. 8 shows TEM analysis results (a and b), and AFM analysis results (c and d), for measuring a diameter and a thickness of a graphene flake of Example 4, …
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Thickness Nm | 1.5–50 nm | graphene flake |
Diameter Um | 0.1–10 µm |
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STRUCTURE AND MANUFACTURING METHOD OF THE STRUCTURE, AND GALLIUM NITRIDE-BASED SEMICONDUCTOR LIGHT-EMITTING DEVICE USING THE STRUCTURE AND MANUFACTURING METHOD OF THE DEVICE
TRANSFERRING METHOD OF GRAPHENE USING SELF-ADHESIVE FILM
Patent
Atlas literature
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US 10,131,803Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1 is an outlined schematic view showing a principle of high pressure homogenizer usable in a preparation method of graphene of an exemplary embodiment. …
FIGS. 2A and 2B (enlarged views in a range of molecular weight of 400 to 500) are drawings showing molecular weight distribution of pitch used for preparation …
FIGS. 3A and 3B (enlarged views in a range of molecular weight of 400 to 500) are drawings showing molecular weight distribution of a dispersant obtained in …
FIG. 4 is a drawing showing the analysis results, after analyzing pitch and a dispersant of Preparation Example 1 by a 13 C C PMAS NMR, respectively.
FIG. 5 is a drawing showing the analysis results, after analyzing pitch 7 and a dispersant of Preparation Example 1 by a F T-IR, respectively.
FIG. 6 is a drawing showing comparison of the analysis results, after analyzing molecular weight distributions of dispersants each of which is obtained in …
FIG. 7 is a micrograph of graphite used as a raw material for preparation of graphene flakes of the Examples (a), and micrographs of graphene flakes each of …
FIG. 8 shows TEM analysis results (a and b), and AFM analysis results (c and d), for measuring a diameter and a thickness of a graphene flake of Example 4, …
FIGS. 9 and 10 are micrographs of graphene flakes each of which is prepared in Comparative Examples 1 and 2.
FIG. 10, it was confirmed that in case of using the dispersant of Comparative preparation Example 2 also, the exfoliating of the graphite was not performed …
FIG. 11 is a visually observed photograph showing evaluation results of redispersibility by redispersing graphene flakes obtained in Example 4 in various …
FIG. 12 is a visually observed photograph showing evaluation results of redispersibility by redispersing graphene flakes obtained in Comparative Example 1 in …
FIG. 13 is a graph showing measurement results of sheet resistance of a graphene film, after preparing the graphene film using graphene flakes of Example 4, in …
FIG. 14 is a drawing showing measurement results of sheet resistance of a film with appearance of the formed film, after preparing a paste 8 composition using …
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A preparation method of graphene, the preparation method comp ri sing: applying a physical force to dispersion of a carbon-based material including graphite or a derivative thereof, and a dispersant, wherein the dispersant includes a mixture of plural kinds of polyaromatic hydrocarbon oxides, containing the polyaromatic hydrocarbon oxides having a molecular weight of 300 to 700 in a content of 6 070 % to 95% by weight wherein the dispersant has an oxy g en content of 12 to 50% by wei g ht, based on total element content, when the plural kinds of pol y aromatic hydrocarbon oxides contained in the dispersant are subjected to elemental analysis, and the graphite or the derivative thereof is formed into a graphene flake having a thickness in nanoscale under application of the physical force. Currently amended
The preparation method of claim 1, wherein the graphite or the derivative thereof is one or more selected from the group consisting of graphite, expanded graphite, indeterminate graphite, planar graphite, artificial graphite, modified graphite having an intercalation compound inserted in a carbon interlayer, and carbon nanofiber. Original
The preparation method of claim 1, wherein the dispersion is dispersion where the carbon-based material and the dispersant are dissolved or dispersed in an aqueous solvent or a polar organic solvent. Original
The preparation method of claim 1, wherein the polyaromatic hydrocarbon oxides contained in the dispersant have a structure where one or more oxygen-containing functional group are bonded to an aromatic hydrocarbon containing 5 to 30 benzene rings. Original
The preparation method of claim 1, wherein the applying of the physical force proceeds by a method using a high speed homogenizer, a high pressure homogenizer, a ball mill, a bead mill or an ultrasonic irradiator. Original
The preparation method of claim 1, wherein the graphene flake has a thickness of 1.5 to 50 nm. Original
The preparation method of claim 1, wherein the graphene flake has a diameter of 0.1 to 10 m, and a diameter/thickness ratio of 50 to 6000. Original
The preparation method of claim 1, wherein the graphene flake is formed in a state where the dispersant is physically attached to a surface of the graphene flake. Original
The preparation method of claim 1, further comprising recovering the graphene flakes from the dispersion of the graphene flakes, and drying the graphene flakes. Original
Canceled
A dispersed composition of graphene, the dispersed composition comprising: graphene flakes to a surface of which a dispersant including a mixture of plural kinds of polyaromatic hydrocarbon oxides, containing the polyaromatic hydrocarbon oxides having a molecular weight of 300 to 1000 in a content of 60% by weight or more, is physically attached; and a polar solvent dissolving or dispersing the graphene flakes. Withdrawn
The dispersed composition of claim 14, wherein it is prepared by forming the graphene flakes to the surface of which the dispersant is physically attached, and then dissolving or dispersing the graphene flakes in the polar solvent. Withdrawn
The dispersed composition of claim 14, wherein the polar solvent includes one or more selected from the group consisting of water, NMP, acetone, DMF, DMSO, ethanol, isopropyl alcohol, methanol, butanol, 2-ethoxy ethanol, 2-butoxy ethanol, 2-methoxy propanol, THF, ethylene glycol, pyridine, dimethylacetamide, N-vinyl pyrrolidone, methyl ethyl ketone, butanone, a -terpinol, formic acid, ethyl acetate and acrylonitrile. Withdrawn
The dispersed composition of claim 14, wherein the graphene flakes to the surface of which the dispersant is physically attached are contained in 50 parts by weight or less, based on 100 parts by weight of the polar solvent. Withdrawn
The dispersed composition of claim 14, wherein it is used as a conductive paste composition, a conductive ink composition, a composition for forming a heat dissipation substrate, an electrically conductive composite, a composite for EMI shielding, or a conductive material for a battery. Withdrawn
Embodiments described in the patent, grouped by the materials and process steps they use.
2 materials1 process step
Preparation of dispersant from petroleum pitch (POSCO) by oxidation in sulfuric acid/nitric acid (3:1 v/v) at 70°C for 3.5 hours, followed by cooling, dilution with distilled water, centrifugation at 3500 rpm for 30 minutes, redispersion, and collection/drying of precipitate. MALDI-TOF, 13C CPMAS NMR, and FT-IR analyses confirmed the presence of polyaromatic hydrocarbon oxides (MW 300-1000 or 300-700, ≥60 wt%) with oxygen-containing functional groups (epoxy, hydroxy, carboxy, -COOH, -OH, -SO₃H).
2 materials3 process steps
Dispersants prepared in the same manner as Preparation Example 1 using a different pitch sample from POSCO, with oxidation reaction times of 1 hour (Prep. Ex. 2), 3.5 hours (Prep. Ex. 3), and 7 hours (Prep. Ex. 4). MALDI-TOF analysis showed that longer oxidation times reduce the content of components with MW >1000 (or >700), yielding dispersants enriched in polyaromatic hydrocarbon oxides with MW 300-1000 (or 300-700).
Materials described outside the worked examples.
graphite or derivative thereof
graphene flake
polar solvent
Measurements and analyses referenced in the patent, with their drawing references.
FIG. 8 shows TEM analysis results (a and b), and AFM analysis results (c and d), for measuring a diameter and a thickness of a graphene flake of Example 4, …
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Thickness Nm | 1.5–50 nm | graphene flake |
Diameter Um | 0.1–10 µm |
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STRUCTURE AND MANUFACTURING METHOD OF THE STRUCTURE, AND GALLIUM NITRIDE-BASED SEMICONDUCTOR LIGHT-EMITTING DEVICE USING THE STRUCTURE AND MANUFACTURING METHOD OF THE DEVICE
TRANSFERRING METHOD OF GRAPHENE USING SELF-ADHESIVE FILM
FIG. 8 shows TEM analysis results (a and b), and AFM analysis results (c and d), for measuring a diameter and a thickness of a graphene flake of Example 4, …
FIG. 8 shows TEM analysis results (a and b), and AFM analysis results (c and d), for measuring a diameter and a thickness of a graphene flake of Example 4, …
FIG. 13 is a graph showing measurement results of sheet resistance of a graphene film, after preparing the graphene film using graphene flakes of Example 4, in …
FIG. 13 is a graph showing measurement results of sheet resistance of a graphene film, after preparing the graphene film using graphene flakes of Example 4, in …
FIG. 14 is a drawing showing measurement results of sheet resistance of a film with appearance of the formed film, after preparing a paste 8 composition using …
Diameter Thickness Ratio | 50–6000 | graphene flake |
Oxygen Content Wt Pct | 12–50 wt% | polyaromatic hydrocarbon oxides dispersant |
Thickness | 6–17 nm | — |
Temperature | 30–200 °C | — |
Thickness | 5–30 nm | — |
FIG. 8 shows TEM analysis results (a and b), and AFM analysis results (c and d), for measuring a diameter and a thickness of a graphene flake of Example 4, …
FIG. 8 shows TEM analysis results (a and b), and AFM analysis results (c and d), for measuring a diameter and a thickness of a graphene flake of Example 4, …
FIG. 13 is a graph showing measurement results of sheet resistance of a graphene film, after preparing the graphene film using graphene flakes of Example 4, in …
FIG. 13 is a graph showing measurement results of sheet resistance of a graphene film, after preparing the graphene film using graphene flakes of Example 4, in …
FIG. 14 is a drawing showing measurement results of sheet resistance of a film with appearance of the formed film, after preparing a paste 8 composition using …
Diameter Thickness Ratio | 50–6000 | graphene flake |
Oxygen Content Wt Pct | 12–50 wt% | polyaromatic hydrocarbon oxides dispersant |
Thickness | 6–17 nm | — |
Temperature | 30–200 °C | — |
Thickness | 5–30 nm | — |
FIG. 8 shows TEM analysis results (a and b), and AFM analysis results (c and d), for measuring a diameter and a thickness of a graphene flake of Example 4, …
FIG. 8 shows TEM analysis results (a and b), and AFM analysis results (c and d), for measuring a diameter and a thickness of a graphene flake of Example 4, …
FIG. 13 is a graph showing measurement results of sheet resistance of a graphene film, after preparing the graphene film using graphene flakes of Example 4, in …
FIG. 13 is a graph showing measurement results of sheet resistance of a graphene film, after preparing the graphene film using graphene flakes of Example 4, in …
FIG. 14 is a drawing showing measurement results of sheet resistance of a film with appearance of the formed film, after preparing a paste 8 composition using …
Diameter Thickness Ratio | 50–6000 | graphene flake |
Oxygen Content Wt Pct | 12–50 wt% | polyaromatic hydrocarbon oxides dispersant |
Thickness | 6–17 nm | — |
Temperature | 30–200 °C | — |
Thickness | 5–30 nm | — |
FIG. 8 shows TEM analysis results (a and b), and AFM analysis results (c and d), for measuring a diameter and a thickness of a graphene flake of Example 4, …
FIG. 8 shows TEM analysis results (a and b), and AFM analysis results (c and d), for measuring a diameter and a thickness of a graphene flake of Example 4, …
FIG. 13 is a graph showing measurement results of sheet resistance of a graphene film, after preparing the graphene film using graphene flakes of Example 4, in …
FIG. 13 is a graph showing measurement results of sheet resistance of a graphene film, after preparing the graphene film using graphene flakes of Example 4, in …
FIG. 14 is a drawing showing measurement results of sheet resistance of a film with appearance of the formed film, after preparing a paste 8 composition using …
Diameter Thickness Ratio | 50–6000 | graphene flake |
Oxygen Content Wt Pct | 12–50 wt% | polyaromatic hydrocarbon oxides dispersant |
Thickness | 6–17 nm | — |
Temperature | 30–200 °C | — |
Thickness | 5–30 nm | — |