Patent
US 11,299,671Preparation method for graphene quantum dots with different oxygen contents, graphene quantum dot, and fluorescent material
Linde ZHANG
US
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Patent drawings and their descriptions. Click a drawing to enlarge it.
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
(Currently Ame n ded) A preparation method for graphene quantum dots with different oxygen contents, comprising following steps: step 1: dispersing a graphene oxide in a p e roxid e solution containing hydroxyl radicals to obtain a graphene oxide dispersion; step 2: r nm xing the graphene oxide dispersion with an alka l i liquor, purifying to obtain a graphe n c quantum dot dry powd er, where in a purifying step comprises reacting the purified product with a reducing agent in a solvent reduce an oxygen co ntent of the graphen e quantum dots, and pu rif ying to o b tain the graphe n e quantu m dot dry powder, wherein the reducing agent is at least one o f: potassium borohydride, zinc-hydrochloric acid, iron-acetic acid, lithium aluminum hydride, sodiu m naphthal cne, sodi um amalgam, and Ran c y nickel, and step 3: loading the graphen c quantum dot dry powder on a carri er, performing a gradient elution to obtain a plurality o f' graphene quantum dots with dif f erent oxygen contents. Currently amended
The preparation method for gr aphe ne quantum dots with different oxygen contents according to claim 1, wherein a mass concentration of the graphene oxide in the graphene oxide dispersion is 0.1%- 5%; and/or, a m ass concentration of the peroxide solution is 3%-30 %. Previously presented
The preparation method for graphene quantum dots with different oxygen contents according to claim 1, wherein the peroxide is at least one selected from the group consisting of hydrogen peroxide, ammonium persulfate, sodium p e rsulfate, potassium hydrogen persulfate, sodium perborate, dib e nzoyl peroxid e and dilauroyl peroxide. Previously presented
The preparation method for graphene quantum dots with different oxygen contents according to claim 1, wherein the gradient elution in step 3 includes perfo r ming the gradient elution using a vacuum liquid chromatography or a column c hr omatography. Previously presented
The p reparation method for g raphene quantum dots with different ox vyen contents according to claim 1, wherein the dots produced have an emission wavelength is 550 nm- 750 rim. Currently amended
(new) T he preparation method f or graphene quantum dots with different oxygen contents according to claim 1, whe re st e p 1 is carried out without the addi t ion of a strong acid. New
The preparation method for graphene quantum dots with different oxygen contents according to claim 1, where st ep 1 is carried out without the addition o f pe rmanganate. New
. Canceled
(Cance ll ed). Canceled
8.. Canceled
. Canceled
11.. Canceled
. Canceled
. Canceled
1 8. A preparation method for graphene quantum dots with di ff erent oxygen contents, comp ri sing: a step of converting a graphene oxide to a graphene quantum d ot powder and a step of puri f ying the graphene quantum dot powder, wherein the step for converting a graphene oxide to a graphene quantum dot consists of: step 1: dispersing a ' graphene oxide in a peroxide solution containing hydroxyl radicals to obtain a graphene oxide dispersion; ste p 2: mixing the graphene oxide dispersion with an alkali liquor, purifying to obtain a graphe n e quantum dot dry powder, wh erein t h e step of purifying the graphene quantum dot powder comprises: step 3: reacting the purified product with a reducing agent in a solvent reduce an oxygen content of the graph e ne quantum dots, and purifying to obtain the graphene quantum dot dry powder, wherein the reducing agent is at least one of: potassium borohydride, zin c -hydrochloric acid, iron-acetic acid, lith ium aluminum hydride, sodium naphthalene, sodium amalgam, and Rane y nickel, and step 4: loading the graphene quantum dot dry powder on a carrier, pe r forming a gradient elution to obtain a plurality of graphene quant um dots with different ox yg en contents. New
Materials described outside the worked examples.
graphene oxide
peroxide solution containing hydroxyl radicals
graphene quantum dots with different oxygen contents
alkali liquor
reducing agent
hydrogen peroxide
H₂O₂
ammonium persulfate
(NH₄)2S₂O₈
sodium persulfate
Na₂S₂O₈
potassium hydrogen persulfate
KHSO₅
sodium perborate
NaBO₃
dibenzoyl peroxide
dilauroyl peroxide
potassium borohydride
KBH₄
zinc-hydrochloric acid
iron-acetic acid
lithium aluminum hydride
LiAlH₄
sodium naphthalene
sodium amalgam
Raney nickel
Additional fabrication and treatment steps described in the patent.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
emission wavelength of graphene quantum dots | 550–750 | graphene quantum dots with different oxygen contents |
Duration | 0.5–4 hours | — |
Related documents with shared materials, methods, properties, or citations.
Patent drawings and their descriptions. Click a drawing to enlarge it.
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
(Currently Ame n ded) A preparation method for graphene quantum dots with different oxygen contents, comprising following steps: step 1: dispersing a graphene oxide in a p e roxid e solution containing hydroxyl radicals to obtain a graphene oxide dispersion; step 2: r nm xing the graphene oxide dispersion with an alka l i liquor, purifying to obtain a graphe n c quantum dot dry powd er, where in a purifying step comprises reacting the purified product with a reducing agent in a solvent reduce an oxygen co ntent of the graphen e quantum dots, and pu rif ying to o b tain the graphe n e quantu m dot dry powder, wherein the reducing agent is at least one o f: potassium borohydride, zinc-hydrochloric acid, iron-acetic acid, lithium aluminum hydride, sodiu m naphthal cne, sodi um amalgam, and Ran c y nickel, and step 3: loading the graphen c quantum dot dry powder on a carri er, performing a gradient elution to obtain a plurality o f' graphene quantum dots with dif f erent oxygen contents. Currently amended
The preparation method for gr aphe ne quantum dots with different oxygen contents according to claim 1, wherein a mass concentration of the graphene oxide in the graphene oxide dispersion is 0.1%- 5%; and/or, a m ass concentration of the peroxide solution is 3%-30 %. Previously presented
The preparation method for graphene quantum dots with different oxygen contents according to claim 1, wherein the peroxide is at least one selected from the group consisting of hydrogen peroxide, ammonium persulfate, sodium p e rsulfate, potassium hydrogen persulfate, sodium perborate, dib e nzoyl peroxid e and dilauroyl peroxide. Previously presented
The preparation method for graphene quantum dots with different oxygen contents according to claim 1, wherein the gradient elution in step 3 includes perfo r ming the gradient elution using a vacuum liquid chromatography or a column c hr omatography. Previously presented
The p reparation method for g raphene quantum dots with different ox vyen contents according to claim 1, wherein the dots produced have an emission wavelength is 550 nm- 750 rim. Currently amended
(new) T he preparation method f or graphene quantum dots with different oxygen contents according to claim 1, whe re st e p 1 is carried out without the addi t ion of a strong acid. New
The preparation method for graphene quantum dots with different oxygen contents according to claim 1, where st ep 1 is carried out without the addition o f pe rmanganate. New
. Canceled
(Cance ll ed). Canceled
8.. Canceled
. Canceled
11.. Canceled
. Canceled
. Canceled
1 8. A preparation method for graphene quantum dots with di ff erent oxygen contents, comp ri sing: a step of converting a graphene oxide to a graphene quantum d ot powder and a step of puri f ying the graphene quantum dot powder, wherein the step for converting a graphene oxide to a graphene quantum dot consists of: step 1: dispersing a ' graphene oxide in a peroxide solution containing hydroxyl radicals to obtain a graphene oxide dispersion; ste p 2: mixing the graphene oxide dispersion with an alkali liquor, purifying to obtain a graphe n e quantum dot dry powder, wh erein t h e step of purifying the graphene quantum dot powder comprises: step 3: reacting the purified product with a reducing agent in a solvent reduce an oxygen content of the graph e ne quantum dots, and purifying to obtain the graphene quantum dot dry powder, wherein the reducing agent is at least one of: potassium borohydride, zin c -hydrochloric acid, iron-acetic acid, lith ium aluminum hydride, sodium naphthalene, sodium amalgam, and Rane y nickel, and step 4: loading the graphene quantum dot dry powder on a carrier, pe r forming a gradient elution to obtain a plurality of graphene quant um dots with different ox yg en contents. New
Materials described outside the worked examples.
graphene oxide
peroxide solution containing hydroxyl radicals
graphene quantum dots with different oxygen contents
alkali liquor
reducing agent
hydrogen peroxide
H₂O₂
ammonium persulfate
(NH₄)2S₂O₈
sodium persulfate
Na₂S₂O₈
potassium hydrogen persulfate
KHSO₅
sodium perborate
NaBO₃
dibenzoyl peroxide
dilauroyl peroxide
potassium borohydride
KBH₄
zinc-hydrochloric acid
iron-acetic acid
lithium aluminum hydride
LiAlH₄
sodium naphthalene
sodium amalgam
Raney nickel
Additional fabrication and treatment steps described in the patent.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
emission wavelength of graphene quantum dots | 550–750 | graphene quantum dots with different oxygen contents |
Duration | 0.5–4 hours | — |
Related documents with shared materials, methods, properties, or citations.
Patent drawings and their descriptions. Click a drawing to enlarge it.
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
(Currently Ame n ded) A preparation method for graphene quantum dots with different oxygen contents, comprising following steps: step 1: dispersing a graphene oxide in a p e roxid e solution containing hydroxyl radicals to obtain a graphene oxide dispersion; step 2: r nm xing the graphene oxide dispersion with an alka l i liquor, purifying to obtain a graphe n c quantum dot dry powd er, where in a purifying step comprises reacting the purified product with a reducing agent in a solvent reduce an oxygen co ntent of the graphen e quantum dots, and pu rif ying to o b tain the graphe n e quantu m dot dry powder, wherein the reducing agent is at least one o f: potassium borohydride, zinc-hydrochloric acid, iron-acetic acid, lithium aluminum hydride, sodiu m naphthal cne, sodi um amalgam, and Ran c y nickel, and step 3: loading the graphen c quantum dot dry powder on a carri er, performing a gradient elution to obtain a plurality o f' graphene quantum dots with dif f erent oxygen contents. Currently amended
The preparation method for gr aphe ne quantum dots with different oxygen contents according to claim 1, wherein a mass concentration of the graphene oxide in the graphene oxide dispersion is 0.1%- 5%; and/or, a m ass concentration of the peroxide solution is 3%-30 %. Previously presented
The preparation method for graphene quantum dots with different oxygen contents according to claim 1, wherein the peroxide is at least one selected from the group consisting of hydrogen peroxide, ammonium persulfate, sodium p e rsulfate, potassium hydrogen persulfate, sodium perborate, dib e nzoyl peroxid e and dilauroyl peroxide. Previously presented
The preparation method for graphene quantum dots with different oxygen contents according to claim 1, wherein the gradient elution in step 3 includes perfo r ming the gradient elution using a vacuum liquid chromatography or a column c hr omatography. Previously presented
The p reparation method for g raphene quantum dots with different ox vyen contents according to claim 1, wherein the dots produced have an emission wavelength is 550 nm- 750 rim. Currently amended
(new) T he preparation method f or graphene quantum dots with different oxygen contents according to claim 1, whe re st e p 1 is carried out without the addi t ion of a strong acid. New
The preparation method for graphene quantum dots with different oxygen contents according to claim 1, where st ep 1 is carried out without the addition o f pe rmanganate. New
. Canceled
(Cance ll ed). Canceled
8.. Canceled
. Canceled
11.. Canceled
. Canceled
. Canceled
1 8. A preparation method for graphene quantum dots with di ff erent oxygen contents, comp ri sing: a step of converting a graphene oxide to a graphene quantum d ot powder and a step of puri f ying the graphene quantum dot powder, wherein the step for converting a graphene oxide to a graphene quantum dot consists of: step 1: dispersing a ' graphene oxide in a peroxide solution containing hydroxyl radicals to obtain a graphene oxide dispersion; ste p 2: mixing the graphene oxide dispersion with an alkali liquor, purifying to obtain a graphe n e quantum dot dry powder, wh erein t h e step of purifying the graphene quantum dot powder comprises: step 3: reacting the purified product with a reducing agent in a solvent reduce an oxygen content of the graph e ne quantum dots, and purifying to obtain the graphene quantum dot dry powder, wherein the reducing agent is at least one of: potassium borohydride, zin c -hydrochloric acid, iron-acetic acid, lith ium aluminum hydride, sodium naphthalene, sodium amalgam, and Rane y nickel, and step 4: loading the graphene quantum dot dry powder on a carrier, pe r forming a gradient elution to obtain a plurality of graphene quant um dots with different ox yg en contents. New
Materials described outside the worked examples.
graphene oxide
peroxide solution containing hydroxyl radicals
graphene quantum dots with different oxygen contents
alkali liquor
reducing agent
hydrogen peroxide
H₂O₂
ammonium persulfate
(NH₄)2S₂O₈
sodium persulfate
Na₂S₂O₈
potassium hydrogen persulfate
KHSO₅
sodium perborate
NaBO₃
dibenzoyl peroxide
dilauroyl peroxide
potassium borohydride
KBH₄
zinc-hydrochloric acid
iron-acetic acid
lithium aluminum hydride
LiAlH₄
sodium naphthalene
sodium amalgam
Raney nickel
Additional fabrication and treatment steps described in the patent.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
emission wavelength of graphene quantum dots | 550–750 | graphene quantum dots with different oxygen contents |
Duration | 0.5–4 hours | — |
Related documents with shared materials, methods, properties, or citations.
Patent drawings and their descriptions. Click a drawing to enlarge it.
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
(Currently Ame n ded) A preparation method for graphene quantum dots with different oxygen contents, comprising following steps: step 1: dispersing a graphene oxide in a p e roxid e solution containing hydroxyl radicals to obtain a graphene oxide dispersion; step 2: r nm xing the graphene oxide dispersion with an alka l i liquor, purifying to obtain a graphe n c quantum dot dry powd er, where in a purifying step comprises reacting the purified product with a reducing agent in a solvent reduce an oxygen co ntent of the graphen e quantum dots, and pu rif ying to o b tain the graphe n e quantu m dot dry powder, wherein the reducing agent is at least one o f: potassium borohydride, zinc-hydrochloric acid, iron-acetic acid, lithium aluminum hydride, sodiu m naphthal cne, sodi um amalgam, and Ran c y nickel, and step 3: loading the graphen c quantum dot dry powder on a carri er, performing a gradient elution to obtain a plurality o f' graphene quantum dots with dif f erent oxygen contents. Currently amended
The preparation method for gr aphe ne quantum dots with different oxygen contents according to claim 1, wherein a mass concentration of the graphene oxide in the graphene oxide dispersion is 0.1%- 5%; and/or, a m ass concentration of the peroxide solution is 3%-30 %. Previously presented
The preparation method for graphene quantum dots with different oxygen contents according to claim 1, wherein the peroxide is at least one selected from the group consisting of hydrogen peroxide, ammonium persulfate, sodium p e rsulfate, potassium hydrogen persulfate, sodium perborate, dib e nzoyl peroxid e and dilauroyl peroxide. Previously presented
The preparation method for graphene quantum dots with different oxygen contents according to claim 1, wherein the gradient elution in step 3 includes perfo r ming the gradient elution using a vacuum liquid chromatography or a column c hr omatography. Previously presented
The p reparation method for g raphene quantum dots with different ox vyen contents according to claim 1, wherein the dots produced have an emission wavelength is 550 nm- 750 rim. Currently amended
(new) T he preparation method f or graphene quantum dots with different oxygen contents according to claim 1, whe re st e p 1 is carried out without the addi t ion of a strong acid. New
The preparation method for graphene quantum dots with different oxygen contents according to claim 1, where st ep 1 is carried out without the addition o f pe rmanganate. New
. Canceled
(Cance ll ed). Canceled
8.. Canceled
. Canceled
11.. Canceled
. Canceled
. Canceled
1 8. A preparation method for graphene quantum dots with di ff erent oxygen contents, comp ri sing: a step of converting a graphene oxide to a graphene quantum d ot powder and a step of puri f ying the graphene quantum dot powder, wherein the step for converting a graphene oxide to a graphene quantum dot consists of: step 1: dispersing a ' graphene oxide in a peroxide solution containing hydroxyl radicals to obtain a graphene oxide dispersion; ste p 2: mixing the graphene oxide dispersion with an alkali liquor, purifying to obtain a graphe n e quantum dot dry powder, wh erein t h e step of purifying the graphene quantum dot powder comprises: step 3: reacting the purified product with a reducing agent in a solvent reduce an oxygen content of the graph e ne quantum dots, and purifying to obtain the graphene quantum dot dry powder, wherein the reducing agent is at least one of: potassium borohydride, zin c -hydrochloric acid, iron-acetic acid, lith ium aluminum hydride, sodium naphthalene, sodium amalgam, and Rane y nickel, and step 4: loading the graphene quantum dot dry powder on a carrier, pe r forming a gradient elution to obtain a plurality of graphene quant um dots with different ox yg en contents. New
Materials described outside the worked examples.
graphene oxide
peroxide solution containing hydroxyl radicals
graphene quantum dots with different oxygen contents
alkali liquor
reducing agent
hydrogen peroxide
H₂O₂
ammonium persulfate
(NH₄)2S₂O₈
sodium persulfate
Na₂S₂O₈
potassium hydrogen persulfate
KHSO₅
sodium perborate
NaBO₃
dibenzoyl peroxide
dilauroyl peroxide
potassium borohydride
KBH₄
zinc-hydrochloric acid
iron-acetic acid
lithium aluminum hydride
LiAlH₄
sodium naphthalene
sodium amalgam
Raney nickel
Additional fabrication and treatment steps described in the patent.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
emission wavelength of graphene quantum dots | 550–750 | graphene quantum dots with different oxygen contents |
Duration | 0.5–4 hours | — |
Related documents with shared materials, methods, properties, or citations.