WO2020009421A1 - Procédé de production d'oxyde de graphite et d'oxyde de graphène de manière respectueuse de l'environnement en utilisant une réaction d'hydroxylation - Google Patents

Procédé de production d'oxyde de graphite et d'oxyde de graphène de manière respectueuse de l'environnement en utilisant une réaction d'hydroxylation Download PDF

Info

Publication number
WO2020009421A1
WO2020009421A1 PCT/KR2019/008034 KR2019008034W WO2020009421A1 WO 2020009421 A1 WO2020009421 A1 WO 2020009421A1 KR 2019008034 W KR2019008034 W KR 2019008034W WO 2020009421 A1 WO2020009421 A1 WO 2020009421A1
Authority
WO
WIPO (PCT)
Prior art keywords
graphene
graphite oxide
oxide
reaction
graphite
Prior art date
Application number
PCT/KR2019/008034
Other languages
English (en)
Korean (ko)
Inventor
이중희
박옥경
김남훈
Original Assignee
전북대학교산학협력단
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 전북대학교산학협력단 filed Critical 전북대학교산학협력단
Publication of WO2020009421A1 publication Critical patent/WO2020009421A1/fr

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/15—Nano-sized carbon materials
    • C01B32/182—Graphene
    • C01B32/184—Preparation
    • C01B32/19—Preparation by exfoliation
    • C01B32/192—Preparation by exfoliation starting from graphitic oxides
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/20—Graphite
    • C01B32/21—After-treatment
    • C01B32/23—Oxidation

Definitions

  • the present invention relates to a method for environmentally friendly production of graphite oxide and graphene oxide using a chemical oxidation reaction capable of introducing a hydroxyl group (-OH) to the surface of the carbon crystal structure, and more specifically, graphite Oxidation reaction on strong acid solutions such as sulfuric acid (H 2 SO 4 ), phosphoric acid (Phosphoric acid, H 3 PO 4 ), nitric acid (HNO 3 )
  • the reaction solvent is used as distilled water (DI-water), and graphite, sodium hydroxide, and potassium permanganate are added to the distilled water to induce a chemical oxidation reaction to sp 2 bonds between carbon and carbon.
  • the present invention relates to an oxidation process that is environmentally friendly and can improve production efficiency.
  • the oxidation method according to the present invention breaks down the neutralization process time, which accounts for most of the acid wastewater treatment and graphite oxide manufacturing process time, which occur in the washing / neutralization process after the oxidation reaction required by the conventional Hummer 'method in terms of the production of graphite oxide. Can be reduced to reduce product production efficiency and cost, providing a great advantage in the industrial mass production of graphite oxide and graphene oxide.
  • Graphene is a two-dimensional carbon allotrope consisting of carbon-to-carbon bonds, and has excellent mechanical properties as well as low electrical resistivity and high thermal conductivity.
  • Graphene is generally manufactured using chemical oxidation / reduction method and chemical vapor deposition method (CVD), and when the chemical vapor deposition method is used, it is possible to produce high quality graphene.
  • CVD chemical oxidation / reduction method
  • CVD chemical vapor deposition method
  • mass production of graphene oxide should be preceded as an essential prerequisite.
  • graphene oxide reacts graphite with oxidizing agents such as potassium permanganate (KMnO 4 ) and hydrogen peroxide (H 2 O 2 ) in strong acidic solutions such as sulfuric acid, nitric acid, and phosphoric acid.
  • oxidizing agents such as potassium permanganate (KMnO 4 ) and hydrogen peroxide (H 2 O 2 ) in strong acidic solutions such as sulfuric acid, nitric acid, and phosphoric acid.
  • the graphene oxide is prepared by applying a shear force through an ultrasonic disperser, a fine homogenizer, or the like and peeling it into a single layer or an aqueous layer.
  • the prepared graphene oxide finally removes the oxygen functional groups formed on the surface through thermal and chemical reduction methods to finally prepare graphene.
  • the method for preparing graphene using a strong acid solution / acid mixture requires a considerably long process time in the process of neutralizing the pH of the reaction mixture to 6 to 7 while washing the acid solvent after the oxidation reaction. Since a large amount of acidic wastewater treatment process is required, additional costs are required in terms of product commercialization and wastewater treatment in terms of product commercialization, resulting in an improvement in the manufacturing cost of the product.
  • the long neutralization process time and the problem of the large amount of wastewater treatment process will be a big consideration in terms of mass production and commercialization of graphene in the future, and it will be greatly noticed in various industries as a preliminary task that requires a technical solution in terms of manufacturing process. have.
  • due to the acid removal / refining process that requires a long time there is a problem that a high speed graphene oxide synthesis process is difficult to be disposed in a continuous process.
  • the inventors of the present invention provide a method for producing an environmentally friendly graphite oxide comprising reacting an alkali ion, an oxidizing agent and a carbon source in a distilled water solution or a hydrophilic organic solvent to chemically oxidize the carbon source. It provides a method for producing high conductivity graphene oxide comprising the step of peeling through the shear stress or ultrasonic dispersion by addition to the phase and a method for producing graphene through a method of chemically reducing or thermally reducing the graphene oxide. .
  • the present invention provides a method for producing environmentally friendly graphite oxide comprising the following steps.
  • the present invention provides a method for producing graphene comprising the following steps.
  • the present invention provides a method for producing graphene comprising the following steps.
  • Graphite oxide and graphene oxide prepared by the present invention is because the oxidation reaction is carried out in distilled water without using an acidic solution, the defects on the surface of the graphite oxide prepared in comparison with the oxidation reaction using a conventionally used strong acid The rate of formation can be reduced to result in the production of high conductivity graphene oxide.
  • no acidic solution is used as the reaction solvent, a neutralization process that takes most of the time for preparing graphene oxide is not required, and thus, a process time for producing graphite oxide can be significantly reduced.
  • an excessive amount generated in the neutralization process Since it does not produce acidic wastewater solution, it is possible to remove industrial wastewater treatment process later. This will significantly reduce the manufacturing cost and production time of the product will provide a great advantage in terms of cost competitiveness and production process efficiency in terms of commercialization of graphene oxide.
  • FIG. 1 illustrates a schematic diagram of an oxidation reaction of natural graphite using an oxidation reaction on distilled water according to one embodiment of the present invention.
  • Example 2 shows Fourier transform infrared spectroscopy (FT-IR) analysis results of Example 1 according to an embodiment of the present invention.
  • FIG. 3 shows the results of thermogravimetric analysis (TGA) of graphene according to Example 1 and Comparative Example 2 according to an embodiment of the present invention.
  • Figure 4 shows the results of confirming the change of the dispersion phase of Example 1 according to an embodiment of the present invention on distilled water and enmethylpyrrolidone (N-Methyl Pyrrolidone, NMP).
  • Example 5 is GO-1 (using the graphene oxide and Hummer 'oxidation method of Example 2 prepared through a process of peeling by applying a shearing force through ultrasonic dispersion in Example 1 according to an embodiment of the present invention) Comparative Example 1) is shown through the analysis of the atomic force microscope (Atomic Force Microscope, AFM).
  • Example 6 is D-band and G of GO-1 (Comparative Example 1) prepared using Example 2 and Hummer 'oxidation method prepared by exfoliating Example 1 through ultrasonic dispersion according to an embodiment of the present invention.
  • the Raman graph shows the change in intensity ratio (I D / I G ) of the -band.
  • Example 7 is a result of comparing the electrical conductivity of Example 1 and GO-1 (Comparative Example 1) prepared using the Hummer 'oxidation method according to an embodiment of the present invention.
  • graphene oxide is a rapid chemical oxidation method in which graphite is reacted with an oxidizing agent such as potassium permanganate (KMnO 4 ) and hydrogen peroxide (H 2 O 2 ) in strong acid solutions such as sulfuric acid, nitric acid, and phosphoric acid.
  • an oxidizing agent such as potassium permanganate (KMnO 4 ) and hydrogen peroxide (H 2 O 2 ) in strong acid solutions such as sulfuric acid, nitric acid, and phosphoric acid.
  • the method for producing graphite oxide using a strong acid solution / acid mixture requires a fairly long process time in the process of neutralizing the pH of the reaction mixture to 6 to 7 while washing the acid solvent after the oxidation reaction, There is a disadvantage in that a large amount of wastewater treatment process generated in the treatment process is required. In addition, due to the acid removal / refining process that requires a long time, there is a problem that a high speed graphene oxide synthesis process is difficult to be disposed in a continuous process.
  • the chemical oxidation reaction is induced by using an aqueous solution containing alkali ions and oxidizing agent of the osmium tetroxide (OsO4) series
  • the reaction solvent was used as distilled water (DI-water), and it was confirmed that graphite oxide could be efficiently produced by drastically reducing the production time in terms of environment-friendly and process.
  • natural graphite, sodium hydroxide (NaOH) and potassium permanganate (KMnO 4 ) were added to 50 mL of distilled water, followed by stirring at 60 ° C. for 3 days (FIG. 1).
  • the present invention provides a method for producing an affinity graphite oxide comprising the following steps.
  • the alkali metal ion may be any one or more selected from the group consisting of sodium hydroxide (NaOH), potassium hydroxide (KOH), barium hydroxide (BrOH) and lithium hydroxide (LiOH), preferably sodium hydroxide.
  • the molar concentration of the alkali metal may be 1 mol to 50 mol, preferably 10 mol to 40 mol, and most preferably 20 to 25 mol.
  • the oxidizing agent may be any one or more selected from the group of onium tetraoxide consisting of potassium permanganate, potassium chlorate, perchloric acid, and hydrogen peroxide, and preferably potassium permanganate.
  • the molar concentration of the oxidant may be 1 mol to 50 mol, preferably 10 mol to 40 mol, and most preferably 20 to 25 mol.
  • Chemical ion bonding between the alkali metal and hydroxyl by the oxidizing agent may form an alkali hydroxide material that generates hydroxide ions and alkali ions in an aqueous solution.
  • the above-mentioned method can be used to form graphite between carbon and carbon atoms on a graphite surface through a chemical reaction between sodium hydroxide (NaOH) in distilled water and potassium oxidant (Potassium permanganate, KMnO 4 ). Conversion of sp 2 bonds to sp 3 bonds can form hydroxyl (Hydroxyl, -OH) functional groups.
  • As a result of comparing the graphite oxide and natural graphite of the present invention it was confirmed that graphite oxide containing about 15 wt% of an oxygen functional group was prepared (FIG. 3).
  • the carbon source may be any one selected from the group consisting of carbon nanotubes, carbon nanowires, carbon nanofibers, graphite, activated carbon, and graphene having sp 2 bonds between carbon atoms, preferably graphite.
  • the hydrophilic organic solvent is selected from the group consisting of dimethylformamide (Dimethylformamide, DMF), ethylenepyrrolidone (N-Methyl Pyrrolidone, NMP), dimethyl sulfoxide (Dimethyl sulfoxide, DMSO) and ethanol (Ethanol, EtOH) It can be either.
  • the reaction may be performed at 40 ° C. to 80 ° C. for 1 day to 10 days, preferably at 50 ° C. to 70 ° C. for 1 day to 8 days, and more preferably The reaction may proceed for 2 to 6 days at 55 °C to 65 °C.
  • the (ii) may be stirred for 1 minute to 120 minutes at room temperature, preferably the reaction may proceed for 1 to 60 minutes at 15 °C to 35 °C, more preferably 1 at 20 °C to 30 °C The reaction may proceed for 30 minutes.
  • the present invention also provides a method for producing graphene oxide comprising the following steps.
  • Graphene oxide is prepared by peeling graphite oxide in the organic solvent or distilled water through shear stress or ultrasonic dispersion.
  • the organic solvent may be any one or more selected from the group consisting of water, methanol, ethanol, dimethylformamide, dimethylacetamide, N-methylpyrrolidone, dimethylformamide, and mixtures thereof, as a hydrophilic solvent.
  • a hydrophilic solvent Preferably N-methylpyrrolidone.
  • the graphite oxide of the present invention After adding the graphite oxide of the present invention to distilled water and NMP phase and proceeding a peeling process through an ultrasonic disperser for 30 minutes, the dispersibility over time was observed to show the dispersed phase even after 30 days (FIG. 4). ).
  • the graphite oxide prepared according to the present invention was irradiated using AFM to confirm whether it is exfoliated in a hydrophilic organic solvent through ultrasonic dispersion to form graphene oxide, and as shown in FIG. It was confirmed that the eggplant was made of graphene oxide.
  • the present invention provides a method for producing graphene comprising the following steps.
  • the reducing agent may be any one or more selected from the group consisting of hydrazine, hydrazine monohydrate, acetichydrazide, sodium or potassium borohydride, N-methyl pyrrolidine and morpholine, preferably hydrazine, hydrazine monohydride It may be any one selected from the group consisting of latex and acetichydrazide, most preferably hydrazine.
  • the shear force rate may be 100 to 10000 rpm, preferably 500 to 10000 rpm, and most preferably 5000 to 6000 rpm.
  • the present invention provides a method for producing graphene comprising the following steps.
  • the temperature range may be 500 ° C or higher, preferably 500 ° C to 1000 ° C, and more preferably 600 ° C to 800 ° C.
  • the oxidation reaction described in the embodiment of the present invention proceeds in distilled water, it will provide advantages in terms of commercialization of graphene oxide and graphene, and also greatly reduces the defect production rate of the surface occurring in the oxidation reaction process, resulting in crystallinity and Since the graphene oxide with improved electrical conductivity can be produced, it can be widely used in materials fields such as high-performance polymer composite materials as well as electrical and electronic devices.
  • Graphite oxide was prepared by exposing the graphite oxide prepared in Example 1 to distilled water or enmethylpyrrolidone (NMP) solution and applying a shear force for 30 minutes using an ultrasonic disperser to perform a peeling process.
  • NMP enmethylpyrrolidone
  • the graphene oxide prepared in Example 2 was specified as GO.
  • Natural graphite was used as an initial material to determine the physical properties, oxidation, and absence of graphite oxide prepared by the oxidation method proposed by the present invention, and 2 was specified in the comparison to prove the results of the present invention.
  • Example 1 In order to confirm the formation and content of the oxidation functional group by the oxidation method proposed in the present invention, it was confirmed by comparing the TGA pyrolysis curves of Example 1 and Comparative Example 2, the results are shown in FIG. As can be seen in FIG. 3, in the case of pure graphite state which does not undergo oxidation reaction, 2 shows a stable pyrolysis curve up to 800 degrees. However, in Example 1 in which the oxidation reaction was performed through the present invention, the pyrolysis curve was shown from 200 degrees by the oxygen functional group, and about 15 wt% in the decomposition temperature range of the oxygen functional group is 200-500 degrees. A weight loss was shown.
  • Example 1 Graphite oxide prepared by the oxidation method proposed in the present invention (Example 1) was examined using AFM to determine whether the graphene oxide was peeled off in a hydrophilic organic solvent through ultrasonic dispersion, and the confirmed results were shown in FIG. 5 is shown. As can be seen in Figure 5 it was confirmed that the case of Example 2 was made of graphene oxide having a thickness of less than about 2nm. Through the above results, it was confirmed that the graphene oxide and the mixed graphene oxide dispersion liquid can be easily prepared by the method for producing graphite oxide and the graphene oxide proposed through the present invention.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Nanotechnology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Carbon And Carbon Compounds (AREA)

Abstract

La présente invention concerne un procédé d'oxydation efficace respectueux de l'environnement servant à produire de l'oxyde de graphite (O-Gr) et de l'oxyde de graphène à haute conductivité (GO) à l'aide d'une réaction d'oxydation chimique capable d'introduire un groupe hydroxyle dans un réseau cristallin de carbone. Plus particulièrement, au lieu de conduire une réaction d'oxydation dans une solution d'acide fort qui est typiquement utilisée en tant que solvant de réaction lors de la production d'oxyde de graphite à partir de graphène, tel que l'acide sulfurique (H2SO4), l'acide phosphorique (H3PO4), et l'acide nitrique (HNO3), le procédé d'oxydation de la présente invention utilise de l'eau désionisée (eau DI) en tant que solvant réactionnel pour la réaction d'oxydation, et en ajoutant du graphite, de l'hydroxyde de sodium et du permanganate de potassium à l'eau DI, induit une réaction d'oxydation chimique, produisant de l'O-Gr et un GO à haute conductivité, ce qui permet de réduire les défauts du réseau. Selon la présente invention, le procédé d'oxydation peut réduire considérablement le temps de traitement et les coûts requis pour le procédé de traitement et de neutralisation des eaux usées acides générées par des procédés de lavage/neutralisation post-réaction dans la production d'O-Gr, et peut ainsi augmenter l'efficacité de la production de produit et en réduire les coûts, offrant un grand avantage dans la production en masse d'O-Gr et de GO.
PCT/KR2019/008034 2018-07-03 2019-07-02 Procédé de production d'oxyde de graphite et d'oxyde de graphène de manière respectueuse de l'environnement en utilisant une réaction d'hydroxylation WO2020009421A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2018-0077191 2018-07-03
KR1020180077191A KR102072914B1 (ko) 2018-07-03 2018-07-03 수산화 반응을 이용한 친환경적으로 산화 흑연 및 산화 그래핀을 제조하는 방법

Publications (1)

Publication Number Publication Date
WO2020009421A1 true WO2020009421A1 (fr) 2020-01-09

Family

ID=69060149

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2019/008034 WO2020009421A1 (fr) 2018-07-03 2019-07-02 Procédé de production d'oxyde de graphite et d'oxyde de graphène de manière respectueuse de l'environnement en utilisant une réaction d'hydroxylation

Country Status (2)

Country Link
KR (1) KR102072914B1 (fr)
WO (1) WO2020009421A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115465860A (zh) * 2022-07-06 2022-12-13 山东海科创新研究院有限公司 一种低氧、高剥离氧化石墨烯的制备方法及所得产品的应用
CN116199378A (zh) * 2023-03-06 2023-06-02 国中创业(北京)环保科技有限公司 一种石墨烯制备工艺中废水资源化处理方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100996883B1 (ko) * 2010-01-08 2010-11-26 전남대학교산학협력단 그라핀시트 제조방법 및 상기 방법으로 제조된 그라핀시트
KR20140062964A (ko) * 2012-11-15 2014-05-27 주식회사 아이디티인터내셔널 산화흑연의 제조방법
KR20140122944A (ko) * 2013-04-11 2014-10-21 주식회사 아이디티인터내셔널 산화흑연의 제조방법 및 제조장치
US20160064726A1 (en) * 2014-08-27 2016-03-03 Semiconductor Energy Laboratory Co., Ltd. Storage battery electrode, manufacturing method thereof, storage battery, electronic device, and graphene
KR20170054941A (ko) * 2015-11-10 2017-05-18 한국에너지기술연구원 층간 간격이 넓어진 환원 그래핀 산화물의 제조방법과 그에 따라 제조된 환원 그래핀산화물 및 이를 포함하는 슈퍼커패시터

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101273492B1 (ko) * 2011-06-16 2013-06-17 인하대학교 산학협력단 수소저장용 전이금속입자가 담지된 흑연분말복합체의 제조방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100996883B1 (ko) * 2010-01-08 2010-11-26 전남대학교산학협력단 그라핀시트 제조방법 및 상기 방법으로 제조된 그라핀시트
KR20140062964A (ko) * 2012-11-15 2014-05-27 주식회사 아이디티인터내셔널 산화흑연의 제조방법
KR20140122944A (ko) * 2013-04-11 2014-10-21 주식회사 아이디티인터내셔널 산화흑연의 제조방법 및 제조장치
US20160064726A1 (en) * 2014-08-27 2016-03-03 Semiconductor Energy Laboratory Co., Ltd. Storage battery electrode, manufacturing method thereof, storage battery, electronic device, and graphene
KR20170054941A (ko) * 2015-11-10 2017-05-18 한국에너지기술연구원 층간 간격이 넓어진 환원 그래핀 산화물의 제조방법과 그에 따라 제조된 환원 그래핀산화물 및 이를 포함하는 슈퍼커패시터

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115465860A (zh) * 2022-07-06 2022-12-13 山东海科创新研究院有限公司 一种低氧、高剥离氧化石墨烯的制备方法及所得产品的应用
CN115465860B (zh) * 2022-07-06 2023-06-16 山东海科创新研究院有限公司 一种低氧、高剥离氧化石墨烯的制备方法及所得产品的应用
CN116199378A (zh) * 2023-03-06 2023-06-02 国中创业(北京)环保科技有限公司 一种石墨烯制备工艺中废水资源化处理方法

Also Published As

Publication number Publication date
KR102072914B1 (ko) 2020-02-03
KR20200004126A (ko) 2020-01-13

Similar Documents

Publication Publication Date Title
WO2017188564A1 (fr) Procédé de fabrication de fibre d'oxyde de graphène, de fibre de graphène, et ou de fibre composite de graphène ou (d'oxyde) de graphène à l'aide d'un procédé de filage humide induit par champ électrique
WO2014081117A1 (fr) Procédé de formation d'une boîte quantique à base de graphène
WO2013081248A1 (fr) Matière réduite d'oxyde de graphène dispersée à une concentration élevée par interaction cation-π et procédé de fabrication de cette matière
WO2017191887A1 (fr) Procédé de fabrication d'une fibre composite d'oxyde de graphène/nanotube de carbone, fibre composite d'oxyde de graphène/graphène ou fibre composite d'oxyde de graphène/graphène/nanotube de carbone utilisant un procédé de filage par voie humide
WO2020009421A1 (fr) Procédé de production d'oxyde de graphite et d'oxyde de graphène de manière respectueuse de l'environnement en utilisant une réaction d'hydroxylation
WO2014058235A1 (fr) Procédé pour former un oxyde de graphène
WO2015106437A1 (fr) Procédé de préparation à grande échelle de boîtes quantiques en graphène
WO2011078462A2 (fr) Dispersion de graphène et composé de polymère liquide ionique-graphène
WO2011055961A2 (fr) Procédé pour fabriquer une feuille de carbone composite par revêtement d'une solution de dispersion mixte sur une feuille de graphite expansé
WO2016045035A1 (fr) Procédé de préparation de graphène
CN101913592A (zh) 共价功能化石墨烯及其制备方法
KR101103672B1 (ko) 대량생산용 산화 그래핀의 원심분리형 연속 합성 정제 장치, 및 이를 이용한 산화 그래핀의 합성 정제 방법
CN109650379B (zh) 一种单壁碳纳米管梯度氧化纯化方法
WO2016043396A1 (fr) Procédé de préparation de graphène dopé à l'azote et graphène dopé à l'azote ainsi préparé
WO2023013938A1 (fr) Procédé de production de film mince conducteur utilisant du graphite expansible
CN110203913B (zh) 一种制备石墨烯的方法
WO2017209380A1 (fr) Procédé de fabrication de balles de graphène
WO2020105926A1 (fr) Oxyde de graphène réduit dopé au soufre, sa méthode de fabrication et nanocomposite de polyimide contenant de l'oxyde de graphène réduit dopé au soufre
WO2020180079A1 (fr) Matériau contenant du carbone obtenu à partir de marc de café, son procédé de production et son utilisation
WO2019059570A1 (fr) Procédé de production de catalyseur de pile à combustible, et catalyseur de pile à combustible ainsi produit
CN108314024B (zh) 一种石墨烯透明导电薄膜的等离子体制备方法
WO2019093660A2 (fr) Procédé de fabrication de maghémite
WO2016114467A1 (fr) Procédé de préparation de nanotubes de carbone à parois multiples, modifiés avec du méthacrylate
KR101425375B1 (ko) 탈수소고리화 반응을 이용한 탄소재료의 후처리 방법, 이를 통하여 후처리 된 탄소재료 및 이를 포함하는 고분자복합재료
WO2016171466A1 (fr) Oxyde de graphène et son procédé de fabrication

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19830674

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19830674

Country of ref document: EP

Kind code of ref document: A1