Patent
US 9,105,780METHOD OF FABRICATING GRAPHENE QUANTUM DOTS AND HIGH QUALITY GRAPHENE QUANTUM DOTS USING THE METHOD
SeokWoo JEON
US
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US 9,105,780Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1 shows a measurement result of x-ray diffractometer (XRD) of the intercalation compound of graphite in accordance with an embodiment of the present …
FIG. 2A is the survey data of x-ray photoelectron spectroscopy showing the presence of carbon and oxygen due to the sodium potassium.
FIG. 3 shows a measurement result of FT-IR spectroscopy of graphene quantum dots in accordance with an embodiment of the present invention. 15
FIG. 4A shows a result of AFM of the A grade grapheme quantum dots by the embodiment 1.
FIG. 5 B shows a luminescence image of the Uv-Vis spectroscopy of the A and B grade graphene quantum dots fabricated by the embodiment 1.
FIG. 6 shows measurement results of emission spectrum of graphene quantum dots in 5 accordance with an embodiment of the present invention.
FIG. 7(b) shows a luminescence photo of graphene quantum dots fabricated by a conventional oxidation/reduction method.
FIG. 8 shows measurement results of the graphene quantum dots fabricated by an 10 embodiment of the present invention and the graphene quantum dots fabricated …
FIG. 9 shows measurement results of emission spectrum of the graphene quantum dots fabricated by an embodiment of the present invention and the graphene …
FIG. 20 4B-b shows the height profile of the line part in the
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A method for fabricat in g high qua li ty graphene quantum dots, comprising the steps of; mixm g graphite powders with metal hc hydrate salts; 5 form in g an in tercalation compound of graphite where in metal ions are in serted by heat ing the mixed solution; and remov in g the metal ions from the in tercalation compound of graphite.
The method accord in g to claim 1, where in the metal hc hydrate salts in clude at least one metal selected from the group consist in g of Li, Na, K, Ca and Mg.
The method accord in g to claim 1, where in the metal ions of the in tercalation compound of graphite is removed by dissolv in g the in tercalated compound m the solvent of one or the mixture selected from the group consist in g of alcohol, ketone, ether, water, amide.
The method accord in g to claim 1, where in the metal hc hydrate is at least one or the compound selected from the group consist in g of sodium acetate trihydrate (NaC 2H₃₀₂ 3H 2 0), sodium carbonate heptahydrate (Na 2CO 3 7H 2 0), sodium citrate pentahydrate (Na₃C₆H sO₇ 5H₂₀), sodium orthophosphate dodecahydrate (Na₃P O 4 12H 2 0), sodium sulfate heptahydrate (Na 2 SO₄ 7H 2 0), sodium sulfate decahydrate (Na 2 SO₄ 10H₂₀), potassium and magnesium sulfate hexahydrate (K 2 SO₄MgC l2 6H 2 0), calcium acetate hexahydrate (Ca(C 2 H₃₀ 2)2 6H₂ 0), calcium carbonate hexahydrate (CaC O 3 6H 2 0), calcium chloride hexahydrate (CaCl 2 6H 2 0), calcium citrate tetrahydrate 17 (Ca 3[O₂ CCH 2 C(OH)(C O₂)CH 2CO2]2 4H 2 0), calcium lactate pentahydrate (Ca(C 5 H₃₀₃) 2 5H₂₀), calcium ni trate t ri hydrate (Ca(N 03)2 3H 2 0), calcium sulfate dehydrate (CaSO₄ 2H 2 0), magnesium acetate tetrahydrate (Mg(C 2 H₃₀ 2)2 4H 2 0), magnesium carbonate pentahydrate (MgC O₃ 5H₂₀), magnesium acetate t n hydrate (Mg(C 2 H₃₀ 2)2 3H 2 0), 5 magnesium ni trate hexahydrate (Mg(N 03)2 6H 2 0), magnesium orthophosphate octahydrate (Mg(P 04)2 8H 20), magnesium sulfate heptahydrate (MgSO₄ 7H 2 0), magnesium tartrate pentahydrate (MgC₄H₄ 06 5H₂₀) and sodium carbonate decahydrate (Na 2CO₃ 10H₂₀)
The method according to claim 1, wherein the heating the mixed solution car n ed out at 10 the temperature range of 70 ~ 400 °C.
The method according to claim 1, further compns ing: re-dispersing the graphene quantum dots into a solvent for ad j ust in g the size of the graphene quantum dots and control h ng the band gap of the graphene quantum dot.
The method according to claim 1, further compns ing: mixin g the graphite powders with at least one 2 dimensional mate ri al selected from the group consisting of MoS2, WS2, MoSe2, MoTe2, TaSe 2, NbSe 2, NiTe 2, BN, and B i2 Te3. 18
Materials described outside the worked examples.
graphite powders
metallic hydrate salts
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG. 1 shows a measurement result of x-ray diffractometer (XRD) of the intercalation compound of graphite in accordance with an embodiment of the present …
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Optical Band Gap | — | graphene quantum dots |
Temperature | 100–400 °C |
Related documents with shared materials, methods, properties, or citations.
Patent
Atlas literature
Patent
US 9,105,780Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1 shows a measurement result of x-ray diffractometer (XRD) of the intercalation compound of graphite in accordance with an embodiment of the present …
FIG. 2A is the survey data of x-ray photoelectron spectroscopy showing the presence of carbon and oxygen due to the sodium potassium.
FIG. 3 shows a measurement result of FT-IR spectroscopy of graphene quantum dots in accordance with an embodiment of the present invention. 15
FIG. 4A shows a result of AFM of the A grade grapheme quantum dots by the embodiment 1.
FIG. 5 B shows a luminescence image of the Uv-Vis spectroscopy of the A and B grade graphene quantum dots fabricated by the embodiment 1.
FIG. 6 shows measurement results of emission spectrum of graphene quantum dots in 5 accordance with an embodiment of the present invention.
FIG. 7(b) shows a luminescence photo of graphene quantum dots fabricated by a conventional oxidation/reduction method.
FIG. 8 shows measurement results of the graphene quantum dots fabricated by an 10 embodiment of the present invention and the graphene quantum dots fabricated …
FIG. 9 shows measurement results of emission spectrum of the graphene quantum dots fabricated by an embodiment of the present invention and the graphene …
FIG. 20 4B-b shows the height profile of the line part in the
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A method for fabricat in g high qua li ty graphene quantum dots, comprising the steps of; mixm g graphite powders with metal hc hydrate salts; 5 form in g an in tercalation compound of graphite where in metal ions are in serted by heat ing the mixed solution; and remov in g the metal ions from the in tercalation compound of graphite.
The method accord in g to claim 1, where in the metal hc hydrate salts in clude at least one metal selected from the group consist in g of Li, Na, K, Ca and Mg.
The method accord in g to claim 1, where in the metal ions of the in tercalation compound of graphite is removed by dissolv in g the in tercalated compound m the solvent of one or the mixture selected from the group consist in g of alcohol, ketone, ether, water, amide.
The method accord in g to claim 1, where in the metal hc hydrate is at least one or the compound selected from the group consist in g of sodium acetate trihydrate (NaC 2H₃₀₂ 3H 2 0), sodium carbonate heptahydrate (Na 2CO 3 7H 2 0), sodium citrate pentahydrate (Na₃C₆H sO₇ 5H₂₀), sodium orthophosphate dodecahydrate (Na₃P O 4 12H 2 0), sodium sulfate heptahydrate (Na 2 SO₄ 7H 2 0), sodium sulfate decahydrate (Na 2 SO₄ 10H₂₀), potassium and magnesium sulfate hexahydrate (K 2 SO₄MgC l2 6H 2 0), calcium acetate hexahydrate (Ca(C 2 H₃₀ 2)2 6H₂ 0), calcium carbonate hexahydrate (CaC O 3 6H 2 0), calcium chloride hexahydrate (CaCl 2 6H 2 0), calcium citrate tetrahydrate 17 (Ca 3[O₂ CCH 2 C(OH)(C O₂)CH 2CO2]2 4H 2 0), calcium lactate pentahydrate (Ca(C 5 H₃₀₃) 2 5H₂₀), calcium ni trate t ri hydrate (Ca(N 03)2 3H 2 0), calcium sulfate dehydrate (CaSO₄ 2H 2 0), magnesium acetate tetrahydrate (Mg(C 2 H₃₀ 2)2 4H 2 0), magnesium carbonate pentahydrate (MgC O₃ 5H₂₀), magnesium acetate t n hydrate (Mg(C 2 H₃₀ 2)2 3H 2 0), 5 magnesium ni trate hexahydrate (Mg(N 03)2 6H 2 0), magnesium orthophosphate octahydrate (Mg(P 04)2 8H 20), magnesium sulfate heptahydrate (MgSO₄ 7H 2 0), magnesium tartrate pentahydrate (MgC₄H₄ 06 5H₂₀) and sodium carbonate decahydrate (Na 2CO₃ 10H₂₀)
The method according to claim 1, wherein the heating the mixed solution car n ed out at 10 the temperature range of 70 ~ 400 °C.
The method according to claim 1, further compns ing: re-dispersing the graphene quantum dots into a solvent for ad j ust in g the size of the graphene quantum dots and control h ng the band gap of the graphene quantum dot.
The method according to claim 1, further compns ing: mixin g the graphite powders with at least one 2 dimensional mate ri al selected from the group consisting of MoS2, WS2, MoSe2, MoTe2, TaSe 2, NbSe 2, NiTe 2, BN, and B i2 Te3. 18
Materials described outside the worked examples.
graphite powders
metallic hydrate salts
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG. 1 shows a measurement result of x-ray diffractometer (XRD) of the intercalation compound of graphite in accordance with an embodiment of the present …
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Optical Band Gap | — | graphene quantum dots |
Temperature | 100–400 °C |
Related documents with shared materials, methods, properties, or citations.
Patent
Atlas literature
Patent
US 9,105,780Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1 shows a measurement result of x-ray diffractometer (XRD) of the intercalation compound of graphite in accordance with an embodiment of the present …
FIG. 2A is the survey data of x-ray photoelectron spectroscopy showing the presence of carbon and oxygen due to the sodium potassium.
FIG. 3 shows a measurement result of FT-IR spectroscopy of graphene quantum dots in accordance with an embodiment of the present invention. 15
FIG. 4A shows a result of AFM of the A grade grapheme quantum dots by the embodiment 1.
FIG. 5 B shows a luminescence image of the Uv-Vis spectroscopy of the A and B grade graphene quantum dots fabricated by the embodiment 1.
FIG. 6 shows measurement results of emission spectrum of graphene quantum dots in 5 accordance with an embodiment of the present invention.
FIG. 7(b) shows a luminescence photo of graphene quantum dots fabricated by a conventional oxidation/reduction method.
FIG. 8 shows measurement results of the graphene quantum dots fabricated by an 10 embodiment of the present invention and the graphene quantum dots fabricated …
FIG. 9 shows measurement results of emission spectrum of the graphene quantum dots fabricated by an embodiment of the present invention and the graphene …
FIG. 20 4B-b shows the height profile of the line part in the
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A method for fabricat in g high qua li ty graphene quantum dots, comprising the steps of; mixm g graphite powders with metal hc hydrate salts; 5 form in g an in tercalation compound of graphite where in metal ions are in serted by heat ing the mixed solution; and remov in g the metal ions from the in tercalation compound of graphite.
The method accord in g to claim 1, where in the metal hc hydrate salts in clude at least one metal selected from the group consist in g of Li, Na, K, Ca and Mg.
The method accord in g to claim 1, where in the metal ions of the in tercalation compound of graphite is removed by dissolv in g the in tercalated compound m the solvent of one or the mixture selected from the group consist in g of alcohol, ketone, ether, water, amide.
The method accord in g to claim 1, where in the metal hc hydrate is at least one or the compound selected from the group consist in g of sodium acetate trihydrate (NaC 2H₃₀₂ 3H 2 0), sodium carbonate heptahydrate (Na 2CO 3 7H 2 0), sodium citrate pentahydrate (Na₃C₆H sO₇ 5H₂₀), sodium orthophosphate dodecahydrate (Na₃P O 4 12H 2 0), sodium sulfate heptahydrate (Na 2 SO₄ 7H 2 0), sodium sulfate decahydrate (Na 2 SO₄ 10H₂₀), potassium and magnesium sulfate hexahydrate (K 2 SO₄MgC l2 6H 2 0), calcium acetate hexahydrate (Ca(C 2 H₃₀ 2)2 6H₂ 0), calcium carbonate hexahydrate (CaC O 3 6H 2 0), calcium chloride hexahydrate (CaCl 2 6H 2 0), calcium citrate tetrahydrate 17 (Ca 3[O₂ CCH 2 C(OH)(C O₂)CH 2CO2]2 4H 2 0), calcium lactate pentahydrate (Ca(C 5 H₃₀₃) 2 5H₂₀), calcium ni trate t ri hydrate (Ca(N 03)2 3H 2 0), calcium sulfate dehydrate (CaSO₄ 2H 2 0), magnesium acetate tetrahydrate (Mg(C 2 H₃₀ 2)2 4H 2 0), magnesium carbonate pentahydrate (MgC O₃ 5H₂₀), magnesium acetate t n hydrate (Mg(C 2 H₃₀ 2)2 3H 2 0), 5 magnesium ni trate hexahydrate (Mg(N 03)2 6H 2 0), magnesium orthophosphate octahydrate (Mg(P 04)2 8H 20), magnesium sulfate heptahydrate (MgSO₄ 7H 2 0), magnesium tartrate pentahydrate (MgC₄H₄ 06 5H₂₀) and sodium carbonate decahydrate (Na 2CO₃ 10H₂₀)
The method according to claim 1, wherein the heating the mixed solution car n ed out at 10 the temperature range of 70 ~ 400 °C.
The method according to claim 1, further compns ing: re-dispersing the graphene quantum dots into a solvent for ad j ust in g the size of the graphene quantum dots and control h ng the band gap of the graphene quantum dot.
The method according to claim 1, further compns ing: mixin g the graphite powders with at least one 2 dimensional mate ri al selected from the group consisting of MoS2, WS2, MoSe2, MoTe2, TaSe 2, NbSe 2, NiTe 2, BN, and B i2 Te3. 18
Materials described outside the worked examples.
graphite powders
metallic hydrate salts
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG. 1 shows a measurement result of x-ray diffractometer (XRD) of the intercalation compound of graphite in accordance with an embodiment of the present …
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Optical Band Gap | — | graphene quantum dots |
Temperature | 100–400 °C |
Related documents with shared materials, methods, properties, or citations.
Patent
Atlas literature
Patent
US 9,105,780Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1 shows a measurement result of x-ray diffractometer (XRD) of the intercalation compound of graphite in accordance with an embodiment of the present …
FIG. 2A is the survey data of x-ray photoelectron spectroscopy showing the presence of carbon and oxygen due to the sodium potassium.
FIG. 3 shows a measurement result of FT-IR spectroscopy of graphene quantum dots in accordance with an embodiment of the present invention. 15
FIG. 4A shows a result of AFM of the A grade grapheme quantum dots by the embodiment 1.
FIG. 5 B shows a luminescence image of the Uv-Vis spectroscopy of the A and B grade graphene quantum dots fabricated by the embodiment 1.
FIG. 6 shows measurement results of emission spectrum of graphene quantum dots in 5 accordance with an embodiment of the present invention.
FIG. 7(b) shows a luminescence photo of graphene quantum dots fabricated by a conventional oxidation/reduction method.
FIG. 8 shows measurement results of the graphene quantum dots fabricated by an 10 embodiment of the present invention and the graphene quantum dots fabricated …
FIG. 9 shows measurement results of emission spectrum of the graphene quantum dots fabricated by an embodiment of the present invention and the graphene …
FIG. 20 4B-b shows the height profile of the line part in the
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A method for fabricat in g high qua li ty graphene quantum dots, comprising the steps of; mixm g graphite powders with metal hc hydrate salts; 5 form in g an in tercalation compound of graphite where in metal ions are in serted by heat ing the mixed solution; and remov in g the metal ions from the in tercalation compound of graphite.
The method accord in g to claim 1, where in the metal hc hydrate salts in clude at least one metal selected from the group consist in g of Li, Na, K, Ca and Mg.
The method accord in g to claim 1, where in the metal ions of the in tercalation compound of graphite is removed by dissolv in g the in tercalated compound m the solvent of one or the mixture selected from the group consist in g of alcohol, ketone, ether, water, amide.
The method accord in g to claim 1, where in the metal hc hydrate is at least one or the compound selected from the group consist in g of sodium acetate trihydrate (NaC 2H₃₀₂ 3H 2 0), sodium carbonate heptahydrate (Na 2CO 3 7H 2 0), sodium citrate pentahydrate (Na₃C₆H sO₇ 5H₂₀), sodium orthophosphate dodecahydrate (Na₃P O 4 12H 2 0), sodium sulfate heptahydrate (Na 2 SO₄ 7H 2 0), sodium sulfate decahydrate (Na 2 SO₄ 10H₂₀), potassium and magnesium sulfate hexahydrate (K 2 SO₄MgC l2 6H 2 0), calcium acetate hexahydrate (Ca(C 2 H₃₀ 2)2 6H₂ 0), calcium carbonate hexahydrate (CaC O 3 6H 2 0), calcium chloride hexahydrate (CaCl 2 6H 2 0), calcium citrate tetrahydrate 17 (Ca 3[O₂ CCH 2 C(OH)(C O₂)CH 2CO2]2 4H 2 0), calcium lactate pentahydrate (Ca(C 5 H₃₀₃) 2 5H₂₀), calcium ni trate t ri hydrate (Ca(N 03)2 3H 2 0), calcium sulfate dehydrate (CaSO₄ 2H 2 0), magnesium acetate tetrahydrate (Mg(C 2 H₃₀ 2)2 4H 2 0), magnesium carbonate pentahydrate (MgC O₃ 5H₂₀), magnesium acetate t n hydrate (Mg(C 2 H₃₀ 2)2 3H 2 0), 5 magnesium ni trate hexahydrate (Mg(N 03)2 6H 2 0), magnesium orthophosphate octahydrate (Mg(P 04)2 8H 20), magnesium sulfate heptahydrate (MgSO₄ 7H 2 0), magnesium tartrate pentahydrate (MgC₄H₄ 06 5H₂₀) and sodium carbonate decahydrate (Na 2CO₃ 10H₂₀)
The method according to claim 1, wherein the heating the mixed solution car n ed out at 10 the temperature range of 70 ~ 400 °C.
The method according to claim 1, further compns ing: re-dispersing the graphene quantum dots into a solvent for ad j ust in g the size of the graphene quantum dots and control h ng the band gap of the graphene quantum dot.
The method according to claim 1, further compns ing: mixin g the graphite powders with at least one 2 dimensional mate ri al selected from the group consisting of MoS2, WS2, MoSe2, MoTe2, TaSe 2, NbSe 2, NiTe 2, BN, and B i2 Te3. 18
Materials described outside the worked examples.
graphite powders
metallic hydrate salts
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG. 1 shows a measurement result of x-ray diffractometer (XRD) of the intercalation compound of graphite in accordance with an embodiment of the present …
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Optical Band Gap | — | graphene quantum dots |
Temperature | 100–400 °C |
Related documents with shared materials, methods, properties, or citations.
solvent for ion removal and re-dispersion
graphene quantum dots
2-dimensional materials
MoS₂
WS₂
MoSe₂
MoTe₂
TaSe₂
NbSe₂
NiTe₂
BN
Bi₂Te₃
FIG. 2A is the survey data of x-ray photoelectron spectroscopy showing the presence of carbon and oxygen due to the sodium potassium.
FIG. 3 shows a measurement result of FT-IR spectroscopy of graphene quantum dots in accordance with an embodiment of the present invention. 15
FIG. 4A shows a result of AFM of the A grade grapheme quantum dots by the embodiment 1.
FIG. 5 B shows a luminescence image of the Uv-Vis spectroscopy of the A and B grade graphene quantum dots fabricated by the embodiment 1.
| — |
Temperature | 150–300 °C | — |
Thickness | ≥ 20 nm | — |
solvent for ion removal and re-dispersion
graphene quantum dots
2-dimensional materials
MoS₂
WS₂
MoSe₂
MoTe₂
TaSe₂
NbSe₂
NiTe₂
BN
Bi₂Te₃
FIG. 2A is the survey data of x-ray photoelectron spectroscopy showing the presence of carbon and oxygen due to the sodium potassium.
FIG. 3 shows a measurement result of FT-IR spectroscopy of graphene quantum dots in accordance with an embodiment of the present invention. 15
FIG. 4A shows a result of AFM of the A grade grapheme quantum dots by the embodiment 1.
FIG. 5 B shows a luminescence image of the Uv-Vis spectroscopy of the A and B grade graphene quantum dots fabricated by the embodiment 1.
| — |
Temperature | 150–300 °C | — |
Thickness | ≥ 20 nm | — |
solvent for ion removal and re-dispersion
graphene quantum dots
2-dimensional materials
MoS₂
WS₂
MoSe₂
MoTe₂
TaSe₂
NbSe₂
NiTe₂
BN
Bi₂Te₃
FIG. 2A is the survey data of x-ray photoelectron spectroscopy showing the presence of carbon and oxygen due to the sodium potassium.
FIG. 3 shows a measurement result of FT-IR spectroscopy of graphene quantum dots in accordance with an embodiment of the present invention. 15
FIG. 4A shows a result of AFM of the A grade grapheme quantum dots by the embodiment 1.
FIG. 5 B shows a luminescence image of the Uv-Vis spectroscopy of the A and B grade graphene quantum dots fabricated by the embodiment 1.
| — |
Temperature | 150–300 °C | — |
Thickness | ≥ 20 nm | — |
solvent for ion removal and re-dispersion
graphene quantum dots
2-dimensional materials
MoS₂
WS₂
MoSe₂
MoTe₂
TaSe₂
NbSe₂
NiTe₂
BN
Bi₂Te₃
FIG. 2A is the survey data of x-ray photoelectron spectroscopy showing the presence of carbon and oxygen due to the sodium potassium.
FIG. 3 shows a measurement result of FT-IR spectroscopy of graphene quantum dots in accordance with an embodiment of the present invention. 15
FIG. 4A shows a result of AFM of the A grade grapheme quantum dots by the embodiment 1.
FIG. 5 B shows a luminescence image of the Uv-Vis spectroscopy of the A and B grade graphene quantum dots fabricated by the embodiment 1.
| — |
Temperature | 150–300 °C | — |
Thickness | ≥ 20 nm | — |