Patent
US 8,501,318Dispersible and Conductive Nano Graphene Platelets
Bor Z. Jang, Aruna Zhamu
US
Copyright © 2026 Matter42. All rights reserved.
Patent
Atlas literature
Patent
US 8,501,318Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1 Electrical conductivity data of the thin films made from GO nano platelets after various 15 periods of de-oxygenation time at 1,000 * C and 1,100* C, …
FIG. 2 Electrical conductivity data plotted as a function of the corresponding oxygen content in GO nano platelets prepared at two de-oxygenation temperatures.
FIG. 3 Electrical conductivity data of GO nano platelet films after various periods of platelet de- oxygenation time at 1,200 * C and 1,350 *C. 20
FIG. 4 Electrical conductivity data of pristine NGPs and their partially oxidized versions prepared according several preferred embodiments of the present …
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A dispersible and electrically conductive nano graphene platelet (NGP) material comprising at least a single-layer or multiple-layer graphene sheet, wherein said NGP material has an oxygen content no greater than 25% by weight and no less than 5% by weight, wherein said nano graphene platelet material is obtained from a process comprising: (a) preparing a pristine NGP material from a graphitic material; and (b) subjecting said pristine NGP material to an oxidation treatment to obtain said dispersible and conductive NGP material.
The material as set forth in claim 1 wherein said NGP has an oxygen content in the range of approximately 5% to 20% by weight inclusive.
The material as set forth in claim 1 wherein said nano graphene platelet material, when formed into a thin film with a thickness no greater than 100 n m, exhibits an electrical conductivity of at least 10 S/cm.
The material as set forth in claim 1 wherein said nano graphene platelet material, when formed into a thin film with a thickness no greater than 100 rim, exhibits an electrical conductivity of at least 100 S/cm.
The material as set forth in claim 1 wherein said nano graphene platelet material, when formed into a thin film with a thickness no greater than 100 n m, exhibits an electrical conductivity of at least 1,000 S/cm.
The material as set forth in claim 1 wherein said nano graphene material has a specific surface area of approximately from 300 m2/g to 2,600 m2/g.
The material as set forth in claim 1 wherein said nano graphene platelet material comprises single-layer graphene.
The material as set forth in claim 1 8 wherein said oxidation treatment comprises subjecting said pristine NGP material to an oxidizing agent selected from ozone, sulfonic vapor (SO 3), an oxygen-containing gas, hydrogen peroxide vapor, nitric acid vapor, or a combination thereof.
The material as set forth in claim 1 wherein said NGP material is produced from the group consisting of natural graphite, artificial graphite, graphite oxide, graphite fluoride, graphite fiber, carbon fiber, carbon nano-fiber, carbon nano-tube, mesophase carbon micro- bead (MCMB) or carbonaceous micro-sphere (CMS), soft carbon, hard carbon, and combinations thereof.
The material as set forth in claim 1 8 wherein said pristine NGP material is obtained from a process comprising a procedure selected from: a. intercalating said graphitic material with a nonoxidizing agent, followed by a thermal or chemical exfoliation treatment in a non-oxidizing environment; b. subjecting said graphitic material to a supercritical fluid environment for intergraphene layer penetration and exfoliation; c. dispersing said graphitic material in a powder form to an aqueous solution containing a surfactant or dispersing agent to obtain a suspension; and d. subjecting said suspension to direct ultrasonication; or a combination thereof.
8.
A dispersible and electrically conductive nano graphene platelet (NGP) material comprising at least a sin gle -layer or multiple-layer graphene sheet, wherein said NGP material has an oxygen content no greater than 25% by weight and no less than 5% by weight and said NGP The m a teri a l as set forth in claim, further comprises eemprisiig a functional group attached to a surface or edge of the nano graphene platelet material, wherein said functional group is selected from alkyl or aryl silane, alkyl or aralkyl group. hydroxyl group. carboxyl group, amine group, f -rop-S '=4, aldehydic group, quinoidal, fluorocarbon, or a combination thereof.
The material as set forth in claim 112, wherein said, further comprising a functional group is selected from alkyl or aryl silane, alkyl or aralkyl group, hydroxyl group, carboxyl group, amine group, sulfenate greup (--;-3, aldehydic group, quinoidal, fluorocarbon, or a combination thereof.
A dispersible and electrically conductive nano graphene platelet (NGP) material comprising at least a sin gle- layer or multiple-la y er graphene sheet, wherein said NGP material has an oxygen content no greater than 25% by weight and no less than 5% by weight, wherein said NGP material is obtained from a process comprising: (a) preparing a graphite intercalation compound (GIC) or graphite oxide (GO) from a laminar graphite material; (b) exposing said GIC or GO to a first temperature for a first period of time to obtain exfoliated graphite; and (c) exposing said exfoliated graphite to a second temperature in a protective atmosphere for a second period of time.
The material as defined in claim 14, wherein said protective atmosphere comprises an inert gas, nitrogen, hydrogen, a combination thereof, or vacuum.
The material as defined in claim 14, wherein said first temperature is between approximately 200 * C and 1,500 *C.
The material as set forth in claim 14 wherein said first temperature is between approximately 800 * C and 1,300 "C.
The material as set forth in claim 14 wherein said second temperature is between approximately 800 * C and 1,500 *C.
The material as set forth in claim 14 wherein said second temperature is at least 1,000*C.
The material preeess as set forth in claim 14 wherein said second temperature is at least 1,200 * C and the second period of time is at least 2 minutes.
Materials described outside the worked examples.
nano graphene platelet (NGP) material
graphitic precursor materials
graphite intercalation compound (GIC)
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG. 1 Electrical conductivity data of the thin films made from GO nano platelets after various 15 periods of de-oxygenation time at 1,000 * C and 1,100* C, …
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
electrical conductivity of NGP thin film | ≥ 10 | nano graphene platelet (NGP) material |
BET specific surface area of NGP material | 300–2600 |
Related documents with shared materials, methods, properties, or citations.
Patent
Atlas literature
Patent
US 8,501,318Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1 Electrical conductivity data of the thin films made from GO nano platelets after various 15 periods of de-oxygenation time at 1,000 * C and 1,100* C, …
FIG. 2 Electrical conductivity data plotted as a function of the corresponding oxygen content in GO nano platelets prepared at two de-oxygenation temperatures.
FIG. 3 Electrical conductivity data of GO nano platelet films after various periods of platelet de- oxygenation time at 1,200 * C and 1,350 *C. 20
FIG. 4 Electrical conductivity data of pristine NGPs and their partially oxidized versions prepared according several preferred embodiments of the present …
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A dispersible and electrically conductive nano graphene platelet (NGP) material comprising at least a single-layer or multiple-layer graphene sheet, wherein said NGP material has an oxygen content no greater than 25% by weight and no less than 5% by weight, wherein said nano graphene platelet material is obtained from a process comprising: (a) preparing a pristine NGP material from a graphitic material; and (b) subjecting said pristine NGP material to an oxidation treatment to obtain said dispersible and conductive NGP material.
The material as set forth in claim 1 wherein said NGP has an oxygen content in the range of approximately 5% to 20% by weight inclusive.
The material as set forth in claim 1 wherein said nano graphene platelet material, when formed into a thin film with a thickness no greater than 100 n m, exhibits an electrical conductivity of at least 10 S/cm.
The material as set forth in claim 1 wherein said nano graphene platelet material, when formed into a thin film with a thickness no greater than 100 rim, exhibits an electrical conductivity of at least 100 S/cm.
The material as set forth in claim 1 wherein said nano graphene platelet material, when formed into a thin film with a thickness no greater than 100 n m, exhibits an electrical conductivity of at least 1,000 S/cm.
The material as set forth in claim 1 wherein said nano graphene material has a specific surface area of approximately from 300 m2/g to 2,600 m2/g.
The material as set forth in claim 1 wherein said nano graphene platelet material comprises single-layer graphene.
The material as set forth in claim 1 8 wherein said oxidation treatment comprises subjecting said pristine NGP material to an oxidizing agent selected from ozone, sulfonic vapor (SO 3), an oxygen-containing gas, hydrogen peroxide vapor, nitric acid vapor, or a combination thereof.
The material as set forth in claim 1 wherein said NGP material is produced from the group consisting of natural graphite, artificial graphite, graphite oxide, graphite fluoride, graphite fiber, carbon fiber, carbon nano-fiber, carbon nano-tube, mesophase carbon micro- bead (MCMB) or carbonaceous micro-sphere (CMS), soft carbon, hard carbon, and combinations thereof.
The material as set forth in claim 1 8 wherein said pristine NGP material is obtained from a process comprising a procedure selected from: a. intercalating said graphitic material with a nonoxidizing agent, followed by a thermal or chemical exfoliation treatment in a non-oxidizing environment; b. subjecting said graphitic material to a supercritical fluid environment for intergraphene layer penetration and exfoliation; c. dispersing said graphitic material in a powder form to an aqueous solution containing a surfactant or dispersing agent to obtain a suspension; and d. subjecting said suspension to direct ultrasonication; or a combination thereof.
8.
A dispersible and electrically conductive nano graphene platelet (NGP) material comprising at least a sin gle -layer or multiple-layer graphene sheet, wherein said NGP material has an oxygen content no greater than 25% by weight and no less than 5% by weight and said NGP The m a teri a l as set forth in claim, further comprises eemprisiig a functional group attached to a surface or edge of the nano graphene platelet material, wherein said functional group is selected from alkyl or aryl silane, alkyl or aralkyl group. hydroxyl group. carboxyl group, amine group, f -rop-S '=4, aldehydic group, quinoidal, fluorocarbon, or a combination thereof.
The material as set forth in claim 112, wherein said, further comprising a functional group is selected from alkyl or aryl silane, alkyl or aralkyl group, hydroxyl group, carboxyl group, amine group, sulfenate greup (--;-3, aldehydic group, quinoidal, fluorocarbon, or a combination thereof.
A dispersible and electrically conductive nano graphene platelet (NGP) material comprising at least a sin gle- layer or multiple-la y er graphene sheet, wherein said NGP material has an oxygen content no greater than 25% by weight and no less than 5% by weight, wherein said NGP material is obtained from a process comprising: (a) preparing a graphite intercalation compound (GIC) or graphite oxide (GO) from a laminar graphite material; (b) exposing said GIC or GO to a first temperature for a first period of time to obtain exfoliated graphite; and (c) exposing said exfoliated graphite to a second temperature in a protective atmosphere for a second period of time.
The material as defined in claim 14, wherein said protective atmosphere comprises an inert gas, nitrogen, hydrogen, a combination thereof, or vacuum.
The material as defined in claim 14, wherein said first temperature is between approximately 200 * C and 1,500 *C.
The material as set forth in claim 14 wherein said first temperature is between approximately 800 * C and 1,300 "C.
The material as set forth in claim 14 wherein said second temperature is between approximately 800 * C and 1,500 *C.
The material as set forth in claim 14 wherein said second temperature is at least 1,000*C.
The material preeess as set forth in claim 14 wherein said second temperature is at least 1,200 * C and the second period of time is at least 2 minutes.
Materials described outside the worked examples.
nano graphene platelet (NGP) material
graphitic precursor materials
graphite intercalation compound (GIC)
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG. 1 Electrical conductivity data of the thin films made from GO nano platelets after various 15 periods of de-oxygenation time at 1,000 * C and 1,100* C, …
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
electrical conductivity of NGP thin film | ≥ 10 | nano graphene platelet (NGP) material |
BET specific surface area of NGP material | 300–2600 |
Related documents with shared materials, methods, properties, or citations.
Patent
Atlas literature
Patent
US 8,501,318Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1 Electrical conductivity data of the thin films made from GO nano platelets after various 15 periods of de-oxygenation time at 1,000 * C and 1,100* C, …
FIG. 2 Electrical conductivity data plotted as a function of the corresponding oxygen content in GO nano platelets prepared at two de-oxygenation temperatures.
FIG. 3 Electrical conductivity data of GO nano platelet films after various periods of platelet de- oxygenation time at 1,200 * C and 1,350 *C. 20
FIG. 4 Electrical conductivity data of pristine NGPs and their partially oxidized versions prepared according several preferred embodiments of the present …
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A dispersible and electrically conductive nano graphene platelet (NGP) material comprising at least a single-layer or multiple-layer graphene sheet, wherein said NGP material has an oxygen content no greater than 25% by weight and no less than 5% by weight, wherein said nano graphene platelet material is obtained from a process comprising: (a) preparing a pristine NGP material from a graphitic material; and (b) subjecting said pristine NGP material to an oxidation treatment to obtain said dispersible and conductive NGP material.
The material as set forth in claim 1 wherein said NGP has an oxygen content in the range of approximately 5% to 20% by weight inclusive.
The material as set forth in claim 1 wherein said nano graphene platelet material, when formed into a thin film with a thickness no greater than 100 n m, exhibits an electrical conductivity of at least 10 S/cm.
The material as set forth in claim 1 wherein said nano graphene platelet material, when formed into a thin film with a thickness no greater than 100 rim, exhibits an electrical conductivity of at least 100 S/cm.
The material as set forth in claim 1 wherein said nano graphene platelet material, when formed into a thin film with a thickness no greater than 100 n m, exhibits an electrical conductivity of at least 1,000 S/cm.
The material as set forth in claim 1 wherein said nano graphene material has a specific surface area of approximately from 300 m2/g to 2,600 m2/g.
The material as set forth in claim 1 wherein said nano graphene platelet material comprises single-layer graphene.
The material as set forth in claim 1 8 wherein said oxidation treatment comprises subjecting said pristine NGP material to an oxidizing agent selected from ozone, sulfonic vapor (SO 3), an oxygen-containing gas, hydrogen peroxide vapor, nitric acid vapor, or a combination thereof.
The material as set forth in claim 1 wherein said NGP material is produced from the group consisting of natural graphite, artificial graphite, graphite oxide, graphite fluoride, graphite fiber, carbon fiber, carbon nano-fiber, carbon nano-tube, mesophase carbon micro- bead (MCMB) or carbonaceous micro-sphere (CMS), soft carbon, hard carbon, and combinations thereof.
The material as set forth in claim 1 8 wherein said pristine NGP material is obtained from a process comprising a procedure selected from: a. intercalating said graphitic material with a nonoxidizing agent, followed by a thermal or chemical exfoliation treatment in a non-oxidizing environment; b. subjecting said graphitic material to a supercritical fluid environment for intergraphene layer penetration and exfoliation; c. dispersing said graphitic material in a powder form to an aqueous solution containing a surfactant or dispersing agent to obtain a suspension; and d. subjecting said suspension to direct ultrasonication; or a combination thereof.
8.
A dispersible and electrically conductive nano graphene platelet (NGP) material comprising at least a sin gle -layer or multiple-layer graphene sheet, wherein said NGP material has an oxygen content no greater than 25% by weight and no less than 5% by weight and said NGP The m a teri a l as set forth in claim, further comprises eemprisiig a functional group attached to a surface or edge of the nano graphene platelet material, wherein said functional group is selected from alkyl or aryl silane, alkyl or aralkyl group. hydroxyl group. carboxyl group, amine group, f -rop-S '=4, aldehydic group, quinoidal, fluorocarbon, or a combination thereof.
The material as set forth in claim 112, wherein said, further comprising a functional group is selected from alkyl or aryl silane, alkyl or aralkyl group, hydroxyl group, carboxyl group, amine group, sulfenate greup (--;-3, aldehydic group, quinoidal, fluorocarbon, or a combination thereof.
A dispersible and electrically conductive nano graphene platelet (NGP) material comprising at least a sin gle- layer or multiple-la y er graphene sheet, wherein said NGP material has an oxygen content no greater than 25% by weight and no less than 5% by weight, wherein said NGP material is obtained from a process comprising: (a) preparing a graphite intercalation compound (GIC) or graphite oxide (GO) from a laminar graphite material; (b) exposing said GIC or GO to a first temperature for a first period of time to obtain exfoliated graphite; and (c) exposing said exfoliated graphite to a second temperature in a protective atmosphere for a second period of time.
The material as defined in claim 14, wherein said protective atmosphere comprises an inert gas, nitrogen, hydrogen, a combination thereof, or vacuum.
The material as defined in claim 14, wherein said first temperature is between approximately 200 * C and 1,500 *C.
The material as set forth in claim 14 wherein said first temperature is between approximately 800 * C and 1,300 "C.
The material as set forth in claim 14 wherein said second temperature is between approximately 800 * C and 1,500 *C.
The material as set forth in claim 14 wherein said second temperature is at least 1,000*C.
The material preeess as set forth in claim 14 wherein said second temperature is at least 1,200 * C and the second period of time is at least 2 minutes.
Materials described outside the worked examples.
nano graphene platelet (NGP) material
graphitic precursor materials
graphite intercalation compound (GIC)
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG. 1 Electrical conductivity data of the thin films made from GO nano platelets after various 15 periods of de-oxygenation time at 1,000 * C and 1,100* C, …
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
electrical conductivity of NGP thin film | ≥ 10 | nano graphene platelet (NGP) material |
BET specific surface area of NGP material | 300–2600 |
Related documents with shared materials, methods, properties, or citations.
Patent
Atlas literature
Patent
US 8,501,318Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1 Electrical conductivity data of the thin films made from GO nano platelets after various 15 periods of de-oxygenation time at 1,000 * C and 1,100* C, …
FIG. 2 Electrical conductivity data plotted as a function of the corresponding oxygen content in GO nano platelets prepared at two de-oxygenation temperatures.
FIG. 3 Electrical conductivity data of GO nano platelet films after various periods of platelet de- oxygenation time at 1,200 * C and 1,350 *C. 20
FIG. 4 Electrical conductivity data of pristine NGPs and their partially oxidized versions prepared according several preferred embodiments of the present …
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A dispersible and electrically conductive nano graphene platelet (NGP) material comprising at least a single-layer or multiple-layer graphene sheet, wherein said NGP material has an oxygen content no greater than 25% by weight and no less than 5% by weight, wherein said nano graphene platelet material is obtained from a process comprising: (a) preparing a pristine NGP material from a graphitic material; and (b) subjecting said pristine NGP material to an oxidation treatment to obtain said dispersible and conductive NGP material.
The material as set forth in claim 1 wherein said NGP has an oxygen content in the range of approximately 5% to 20% by weight inclusive.
The material as set forth in claim 1 wherein said nano graphene platelet material, when formed into a thin film with a thickness no greater than 100 n m, exhibits an electrical conductivity of at least 10 S/cm.
The material as set forth in claim 1 wherein said nano graphene platelet material, when formed into a thin film with a thickness no greater than 100 rim, exhibits an electrical conductivity of at least 100 S/cm.
The material as set forth in claim 1 wherein said nano graphene platelet material, when formed into a thin film with a thickness no greater than 100 n m, exhibits an electrical conductivity of at least 1,000 S/cm.
The material as set forth in claim 1 wherein said nano graphene material has a specific surface area of approximately from 300 m2/g to 2,600 m2/g.
The material as set forth in claim 1 wherein said nano graphene platelet material comprises single-layer graphene.
The material as set forth in claim 1 8 wherein said oxidation treatment comprises subjecting said pristine NGP material to an oxidizing agent selected from ozone, sulfonic vapor (SO 3), an oxygen-containing gas, hydrogen peroxide vapor, nitric acid vapor, or a combination thereof.
The material as set forth in claim 1 wherein said NGP material is produced from the group consisting of natural graphite, artificial graphite, graphite oxide, graphite fluoride, graphite fiber, carbon fiber, carbon nano-fiber, carbon nano-tube, mesophase carbon micro- bead (MCMB) or carbonaceous micro-sphere (CMS), soft carbon, hard carbon, and combinations thereof.
The material as set forth in claim 1 8 wherein said pristine NGP material is obtained from a process comprising a procedure selected from: a. intercalating said graphitic material with a nonoxidizing agent, followed by a thermal or chemical exfoliation treatment in a non-oxidizing environment; b. subjecting said graphitic material to a supercritical fluid environment for intergraphene layer penetration and exfoliation; c. dispersing said graphitic material in a powder form to an aqueous solution containing a surfactant or dispersing agent to obtain a suspension; and d. subjecting said suspension to direct ultrasonication; or a combination thereof.
8.
A dispersible and electrically conductive nano graphene platelet (NGP) material comprising at least a sin gle -layer or multiple-layer graphene sheet, wherein said NGP material has an oxygen content no greater than 25% by weight and no less than 5% by weight and said NGP The m a teri a l as set forth in claim, further comprises eemprisiig a functional group attached to a surface or edge of the nano graphene platelet material, wherein said functional group is selected from alkyl or aryl silane, alkyl or aralkyl group. hydroxyl group. carboxyl group, amine group, f -rop-S '=4, aldehydic group, quinoidal, fluorocarbon, or a combination thereof.
The material as set forth in claim 112, wherein said, further comprising a functional group is selected from alkyl or aryl silane, alkyl or aralkyl group, hydroxyl group, carboxyl group, amine group, sulfenate greup (--;-3, aldehydic group, quinoidal, fluorocarbon, or a combination thereof.
A dispersible and electrically conductive nano graphene platelet (NGP) material comprising at least a sin gle- layer or multiple-la y er graphene sheet, wherein said NGP material has an oxygen content no greater than 25% by weight and no less than 5% by weight, wherein said NGP material is obtained from a process comprising: (a) preparing a graphite intercalation compound (GIC) or graphite oxide (GO) from a laminar graphite material; (b) exposing said GIC or GO to a first temperature for a first period of time to obtain exfoliated graphite; and (c) exposing said exfoliated graphite to a second temperature in a protective atmosphere for a second period of time.
The material as defined in claim 14, wherein said protective atmosphere comprises an inert gas, nitrogen, hydrogen, a combination thereof, or vacuum.
The material as defined in claim 14, wherein said first temperature is between approximately 200 * C and 1,500 *C.
The material as set forth in claim 14 wherein said first temperature is between approximately 800 * C and 1,300 "C.
The material as set forth in claim 14 wherein said second temperature is between approximately 800 * C and 1,500 *C.
The material as set forth in claim 14 wherein said second temperature is at least 1,000*C.
The material preeess as set forth in claim 14 wherein said second temperature is at least 1,200 * C and the second period of time is at least 2 minutes.
Materials described outside the worked examples.
nano graphene platelet (NGP) material
graphitic precursor materials
graphite intercalation compound (GIC)
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG. 1 Electrical conductivity data of the thin films made from GO nano platelets after various 15 periods of de-oxygenation time at 1,000 * C and 1,100* C, …
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
electrical conductivity of NGP thin film | ≥ 10 | nano graphene platelet (NGP) material |
BET specific surface area of NGP material | 300–2600 |
Related documents with shared materials, methods, properties, or citations.
graphite oxide (GO)
FIG. 2 Electrical conductivity data plotted as a function of the corresponding oxygen content in GO nano platelets prepared at two de-oxygenation temperatures.
FIG. 3 Electrical conductivity data of GO nano platelet films after various periods of platelet de- oxygenation time at 1,200 * C and 1,350 *C. 20
FIG. 4 Electrical conductivity data of pristine NGPs and their partially oxidized versions prepared according several preferred embodiments of the present …
Duration | 5–30 seconds | — |
Pressure | 7.4–69 MPa | — |
Duration | 600–86400 s | — |
Duration | 1–120 minutes | — |
Duration | 1–80 minutes | — |
Pressure | 1070–10000 psi | — |
Duration | 10–120 minutes | — |
Duration | 10–80 minutes | — |
Thickness | ≤ 1 nm | — |
Thickness | ≤ 10 nm | — |
Pressure | ≥ 7.4 MPa | — |
Thickness | ≥ 1 nm | — |
Duration | ≥ 2 minutes | — |
Thickness | ≤ 10 µm | — |
Thickness | ≤ 1 µm | — |
Thickness | ≤ 2 nm | — |
Duration | ≤ 15 seconds | — |
Pressure | ≥ 22.1 MPa | — |
Duration | ≥ 10 minutes | — |
Duration | ≥ 5 minutes | — |
Compression Processes for Graphene Sheets
graphite oxide (GO)
FIG. 2 Electrical conductivity data plotted as a function of the corresponding oxygen content in GO nano platelets prepared at two de-oxygenation temperatures.
FIG. 3 Electrical conductivity data of GO nano platelet films after various periods of platelet de- oxygenation time at 1,200 * C and 1,350 *C. 20
FIG. 4 Electrical conductivity data of pristine NGPs and their partially oxidized versions prepared according several preferred embodiments of the present …
Duration | 5–30 seconds | — |
Pressure | 7.4–69 MPa | — |
Duration | 600–86400 s | — |
Duration | 1–120 minutes | — |
Duration | 1–80 minutes | — |
Pressure | 1070–10000 psi | — |
Duration | 10–120 minutes | — |
Duration | 10–80 minutes | — |
Thickness | ≤ 1 nm | — |
Thickness | ≤ 10 nm | — |
Pressure | ≥ 7.4 MPa | — |
Thickness | ≥ 1 nm | — |
Duration | ≥ 2 minutes | — |
Thickness | ≤ 10 µm | — |
Thickness | ≤ 1 µm | — |
Thickness | ≤ 2 nm | — |
Duration | ≤ 15 seconds | — |
Pressure | ≥ 22.1 MPa | — |
Duration | ≥ 10 minutes | — |
Duration | ≥ 5 minutes | — |
Compression Processes for Graphene Sheets
graphite oxide (GO)
FIG. 2 Electrical conductivity data plotted as a function of the corresponding oxygen content in GO nano platelets prepared at two de-oxygenation temperatures.
FIG. 3 Electrical conductivity data of GO nano platelet films after various periods of platelet de- oxygenation time at 1,200 * C and 1,350 *C. 20
FIG. 4 Electrical conductivity data of pristine NGPs and their partially oxidized versions prepared according several preferred embodiments of the present …
Duration | 5–30 seconds | — |
Pressure | 7.4–69 MPa | — |
Duration | 600–86400 s | — |
Duration | 1–120 minutes | — |
Duration | 1–80 minutes | — |
Pressure | 1070–10000 psi | — |
Duration | 10–120 minutes | — |
Duration | 10–80 minutes | — |
Thickness | ≤ 1 nm | — |
Thickness | ≤ 10 nm | — |
Pressure | ≥ 7.4 MPa | — |
Thickness | ≥ 1 nm | — |
Duration | ≥ 2 minutes | — |
Thickness | ≤ 10 µm | — |
Thickness | ≤ 1 µm | — |
Thickness | ≤ 2 nm | — |
Duration | ≤ 15 seconds | — |
Pressure | ≥ 22.1 MPa | — |
Duration | ≥ 10 minutes | — |
Duration | ≥ 5 minutes | — |
Compression Processes for Graphene Sheets
graphite oxide (GO)
FIG. 2 Electrical conductivity data plotted as a function of the corresponding oxygen content in GO nano platelets prepared at two de-oxygenation temperatures.
FIG. 3 Electrical conductivity data of GO nano platelet films after various periods of platelet de- oxygenation time at 1,200 * C and 1,350 *C. 20
FIG. 4 Electrical conductivity data of pristine NGPs and their partially oxidized versions prepared according several preferred embodiments of the present …
Duration | 5–30 seconds | — |
Pressure | 7.4–69 MPa | — |
Duration | 600–86400 s | — |
Duration | 1–120 minutes | — |
Duration | 1–80 minutes | — |
Pressure | 1070–10000 psi | — |
Duration | 10–120 minutes | — |
Duration | 10–80 minutes | — |
Thickness | ≤ 1 nm | — |
Thickness | ≤ 10 nm | — |
Pressure | ≥ 7.4 MPa | — |
Thickness | ≥ 1 nm | — |
Duration | ≥ 2 minutes | — |
Thickness | ≤ 10 µm | — |
Thickness | ≤ 1 µm | — |
Thickness | ≤ 2 nm | — |
Duration | ≤ 15 seconds | — |
Pressure | ≥ 22.1 MPa | — |
Duration | ≥ 10 minutes | — |
Duration | ≥ 5 minutes | — |
Compression Processes for Graphene Sheets