WO2016129441A1 - 炭素系発光材料の製造方法 - Google Patents
炭素系発光材料の製造方法 Download PDFInfo
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- WO2016129441A1 WO2016129441A1 PCT/JP2016/052977 JP2016052977W WO2016129441A1 WO 2016129441 A1 WO2016129441 A1 WO 2016129441A1 JP 2016052977 W JP2016052977 W JP 2016052977W WO 2016129441 A1 WO2016129441 A1 WO 2016129441A1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/65—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing carbon
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- 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
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
Definitions
- the present invention relates to a method for producing a carbon-based luminescent material.
- carbon-based luminescent materials have attracted attention as luminescent materials.
- An example of the carbon-based luminescent material is graphene quantum dots. Graphene quantum dots are expected to be superior to semiconductor quantum dots in terms of price, safety, chemical stability, and the like.
- the existing manufacturing methods of carbon-based luminescent materials are roughly classified into two types, a top-down method and a bottom-up method (Non-Patent Document 1).
- the top-down method is a method in which a bulk material having a graphite structure such as carbon fiber, coke, graphene oxide or the like is decomposed and prepared to a nano level using a physical or chemical method.
- the top-down method is a method that can be mass-produced.
- a carbon-based luminescent material having a light emission characteristic that is difficult to produce narrow-band light emission and that is industrially applicable has not been produced by this method.
- the bottom-up method uses a low-molecular compound as a carbon source and is chemically synthesized by firing or hydrothermal reaction.
- a carbon-based light-emitting material that exhibits an extremely high quantum yield of about 70% or more by applying an appropriate dope to the product is produced by a dry method in which cystine is fired as a raw material, the yield is extremely low (non- Patent Document 2).
- Non-Patent Document 3 a method for producing a carbon-based luminescent material by a wet method is described in Non-Patent Document 3, but even if the same reaction conditions are repeated, a carbon-based luminescent material cannot be obtained. There was a problem with reproducibility.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method capable of easily synthesizing a carbon-based light emitting material having a high quantum yield and excellent light emission characteristics with high yield and good reproducibility.
- the present inventors have mixed a raw material containing a polyvalent carboxylic acid, an acid catalyst and a solvent, and heated to obtain a carbon-based luminescent material.
- the present invention was completed by finding that the material exhibits a high quantum yield.
- this invention provides the manufacturing method of the following carbon-type luminescent material.
- a method for producing a carbon-based luminescent material comprising mixing a raw material containing a polyvalent carboxylic acid, an acid catalyst, and a solvent and heating the mixture.
- the manufacturing method of the 1 or 2 carbon type luminescent material in which the said raw material contains an amino group containing compound further. 4).
- a carbon-based luminescent material having a high quantum yield and excellent luminescent properties can be easily synthesized with high yield and good reproducibility.
- the method for producing a carbon-based luminescent material of the present invention is a method in which a raw material containing a polycarboxylic acid, an acid catalyst, and a solvent are mixed and heated.
- the polyvalent carboxylic acid is not particularly limited as long as it is a raw material of a carbon-based light emitting material and has two or more carboxyl groups. Specific examples thereof include citric acid, oxalic acid, malonic acid, succinic acid, fumaric acid, itaconic acid, malic acid, tartaric acid and the like. Of these, citric acid, succinic acid, and oxalic acid are preferable, and citric acid is more preferable.
- the polyvalent carboxylic acid may be used alone or in combination of two or more.
- an amino group-containing compound is further contained as a raw material.
- amino groups amino acids, amino group-containing polyalkylene glycols, primary aliphatic amines and the like are preferable. Of these, amino acids are particularly preferred.
- the amino group-containing compound may be used alone or in combination of two or more.
- amino acids examples include cysteine, glycine, alanine, valine, phenylalanine, threonine, lysine, asparagine, tryptophan, serine, glutamic acid, aspartic acid, ornithine, thyroxine, cystine, leucine, isoleucine, proline, tyrosine, asparagine, glutamine, histidine, Examples include methionine and threonine.
- amino group-containing polyalkylene glycol examples include amino group-containing polyethylene glycol and amino group-containing polypropylene glycol. Of these, cysteine, glycine, amino group-containing polyethylene glycol and the like are preferable. When the amino acid has an optical isomer, the amino acid may be D-form, L-form, or racemate.
- the amount of the amino group-containing compound used is preferably 10 to 90 parts by mass, more preferably 20 to 80 parts by mass with respect to 100 parts by mass of the polyvalent carboxylic acid, from the viewpoint of uniform nitrogen introduction efficiency.
- organic compounds other than polyvalent carboxylic acids and amino group-containing compounds may be used as raw materials.
- Such an organic compound is not particularly limited as long as it does not hinder the effects of the present invention.
- the acid catalyst may be a homogeneous acid catalyst or a heterogeneous acid catalyst, but a heterogeneous acid catalyst is preferred from the viewpoint of improving quantum yield.
- the homogeneous acid catalyst include inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid and phosphoric acid, and organic acids such as sulfonic acid and p-toluenesulfonic acid.
- the heterogeneous acid catalyst is preferably a solid acid catalyst, such as a cationic ion exchange resin, a cationic ion exchange membrane, or a solid acid catalyst described in Nature 438, p. 178 (2005). It is done.
- the solid acid catalyst a commercially available product can be used.
- AMBERLYST registered trademark 15 16, 31, 35, etc. manufactured by Rohm and Haas
- AMBERLITE registered trademark IR120B, IR124, 200CT , 252 and the like
- NAFION registered trademark of an ion exchange membrane manufactured by DuPont
- inorganic solid acid catalysts such as zeolite and polyphosphoric acid.
- the acid catalyst may be used alone or in combination of two or more.
- the homogeneous acid catalyst is usually added in an amount of 0.01 to 10% by mass, more preferably 0.1 to 5% by mass, and more preferably 0.5 to 1% by mass with respect to the mass of the raw material. Even more preferred.
- the heterogeneous acid catalyst is preferably a porous body having pores that can enclose the produced carbon-based luminescent material.
- the particle diameter or disk diameter of the carbon-based luminescent material produced can be controlled by the size of the pores. In general, it is preferable to produce a carbon-based luminescent material having a particle diameter (disk diameter) of up to 20 nm using a porous solid acid catalyst having a pore diameter of up to 20 nm.
- a heterogeneous acid catalyst When a heterogeneous acid catalyst is used, it is preferably added in an amount of about 0.1 to 100% by weight, more preferably 1.0 to 50% by weight, more preferably 5.0 to 10% by weight based on the weight of the raw material. Even more preferred.
- the solvent is not particularly limited as long as it can dissolve the raw material to be used.
- solvents include water, dimethyl sulfoxide, dimethylformamide, dimethylacetamide, N-methyl-2-pyrrolidone, hexamethylphosphoric triamide, acetonitrile, acetone, alcohols (methanol, ethanol, 1-propanol, 2-propanol Etc.), glycols (ethylene glycol, triethylene glycol etc.), cellosolves (ethyl cellosolve, methyl cellosolve etc.), polyhydric alcohols (glycerin, pentaerythritol etc.), tetrahydrofuran, toluene, ethyl acetate, butyl acetate, benzene, Examples include toluene, xylene, pentane, hexane, heptane, chlorobenzene, dichlorobenzene, trichlorobenzene, hex
- the amount of the solvent used is preferably 100 to 10,000 parts by mass, more preferably 400 to 2,500 parts by mass with respect to 100 parts by mass of the raw material from the viewpoint of preparing a carbon-based light emitting material having a uniform particle size.
- the production method of the present invention may be performed in the presence of a surfactant.
- a surfactant a cationic surfactant, an anionic surfactant, and a nonionic surfactant are preferable.
- Examples of the cationic surfactant include cetyltrimethylammonium bromide (CTABr) and cetyltrimethylammonium chloride (CTACl).
- Examples of the anionic surfactant include sodium dodecyl sulfate (SDS) and sodium dodecyl benzene sulfonate.
- Examples of nonionic surfactants include polyethylene glycol (PEG) and polypropylene glycol (PPG). The surfactants may be used singly or in combination of two or more.
- the amount of the surfactant used is preferably 10 to 2,000 parts by mass, more preferably 50 to 500 parts by mass with respect to 100 parts by mass of the raw material, from the viewpoint of the dispersibility of the raw material and the critical micelle concentration under the synthesis conditions. .
- a raw material, an acid catalyst, a solvent, and, if necessary, a surfactant are mixed and heated, but these may be mixed in any order.
- the raw material and, if necessary, the surfactant may be added to the solvent in advance, and then the acid catalyst may be added, or the raw material, the acid catalyst, and if necessary, the surfactant may be added to the solvent at the same time.
- Heating may be performed under normal pressure (atmospheric pressure) or under pressure.
- the reaction temperature can be raised above the boiling point at normal pressure, so that the reaction time can be shortened compared to the case of reacting at normal pressure.
- an autoclave When pressurizing, for example, an autoclave may be used.
- the reaction temperature can be raised above the boiling point at normal pressure.
- a reaction temperature of about 200 ° C. can be easily achieved by reacting using an autoclave.
- the pressurization is not particularly limited as long as it can achieve a desired reaction temperature, but is preferably about 200 kPa to 2.0 MPa, more preferably about 500 kPa to 1.0 MPa.
- the reaction temperature depends on the boiling point of the solvent used, but is usually preferably about 40 to 250 ° C, more preferably 60 to 200 ° C, and even more preferably 100 to 150 ° C. Heating is usually performed in a water bath or an oil bath, but heating can also be performed with a microwave. Thus, for example, when water is used as the solvent, the product can be obtained in a shorter time than when heating in a water bath or oil bath.
- the reaction time is preferably about 1 minute to 240 hours, more preferably about 10 minutes to 48 hours, and even more preferably about 12 to 30 hours.
- the reaction time is preferably about 1 minute to 24 hours, more preferably about 10 minutes to 12 hours, and even more preferably about 30 minutes to 3 hours.
- the stirring speed is preferably about 10 to 500 rpm, more preferably about 50 to 300 rpm.
- the obtained product can be purified by removing low molecular weight impurities by dialysis, ultrafiltration or the like, and then removing high molecular weight impurities by centrifugation or the like. What is necessary is just to set suitably the hole diameter of a dialysis membrane or an ultrafiltration membrane, and the centrifugal force at the time of centrifugation according to the molecular weight of what is removed.
- column purification may be performed.
- the column packing in this case may be normal phase or reverse phase.
- the normal phase filler silica particles, alumina particles and the like can be used.
- the reverse phase filler silica particles whose surface is modified with a long-chain alkyl group can be used. Moreover, you may pressurize during column purification from the point of time shortening.
- the carbon-based luminescent material produced by the method of the present invention preferably includes a graphene structure from the viewpoints of chemical stability, luminescence quantum yield, luminescence property control, and the like.
- the carbon-based light emitting material emits light having a wavelength of 380 to 480 nm.
- the carbon-based luminescent material produced by the method of the present invention preferably has a quantum yield of approximately 30% or more, more preferably 50% or more, and even more preferably 60% or more. Further, the half width of the emission spectrum is preferably 100 nm or less, more preferably 90 nm or less, and still more preferably 80 nm or less.
- Example 2 A solution of 0.67 g (3.1 mmol) of citric acid monohydrate and 0.33 g (2.72 mmol) of L-cysteine in 24 mL of deionized water was placed in a 50 mL sample bottle. To the resulting solution was added a stir bar and 0.05 g of Amberlyst 15. This was mounted in a Teflon (registered trademark) inner mounted in a stainless steel autoclave and heated to 200 ° C. over 40 minutes. The atmospheric pressure gradually increased and became constant at 0.8 MPa 30 minutes after reaching 200 ° C. The reaction was continued for 30 minutes and the mixture was allowed to cool to room temperature. The brown precipitate and the solid catalyst were removed with a 0.2 ⁇ m filter to obtain a pale yellow solution. As a result, an aqueous dispersion containing the carbon-based luminescent material 2 was obtained.
- Example 3 A 100 mL three-necked flask was charged with 0.40 g (1.9 mmol) of citric acid monohydrate, 0.10 g (0.8 mmol) of L-cysteine and 0.5 mL of deionized water to prepare a solution. The obtained solution was impregnated with 0.05 g of Nafion (manufactured by DuPont) and reacted at 100 ° C. for 25 hours. The product was extracted from Nafion with 10 mL of water to obtain an aqueous dispersion containing the carbon-based luminescent material 3.
- Example 4 A 50 mL sample bottle was charged with 0.80 g (3.8 mmol) of citric acid monohydrate, 0.20 g (1.7 mmol) of L-cysteine and 24 mL of deionized water to prepare a solution. To the resulting solution was added a stir bar and 0.05 g of Amberlyst 15. This was mounted in a Teflon (registered trademark) inner mounted in a stainless steel autoclave and heated to 200 ° C. over 40 minutes. The atmospheric pressure gradually increased and became constant at 0.8 MPa after 30 minutes. The reaction was continued for 30 minutes and the mixture was allowed to cool to room temperature. The brown precipitate and solid catalyst were removed with a 0.2 ⁇ m filter to give a yellow solution. As a result, an aqueous dispersion containing the carbon-based luminescent material 4 was obtained.
- Example 5 In a 50 mL sample bottle, put 0.8 g (3.8 mmol) of citric acid monohydrate, 0.2 g (1.7 mmol) of L-cysteine, 2.5 g (8.7 mmol) of SDS and 2.5 mL of deionized water, A solution was prepared. A stir bar and 0.05 g of concentrated sulfuric acid were added to the resulting solution. This was mounted in a Teflon (registered trademark) inner mounted in a stainless steel autoclave and heated to 200 ° C. over 40 minutes. The atmospheric pressure gradually increased and became constant at 0.8 MPa after 30 minutes. The reaction was continued for 90 minutes and allowed to cool to room temperature. The brown precipitate and the solid catalyst were removed with a 0.2 ⁇ m filter to obtain an ocher solution. As a result, an aqueous dispersion containing the carbon-based luminescent material 5 was obtained.
- Teflon registered trademark
- Example 6 A 100 mL three-necked flask equipped with a Dimroth condenser and a thermometer was charged with citric acid monohydrate 0.80 g (3.8 mmol), L-cysteine 0.20 g (1.7 mmol), SDS 2.5 g (8.7 mmol) and A solution was prepared by adding 2.5 mL of deionized water. A stir bar and 0.05 g of concentrated sulfuric acid were added to the resulting solution, and the mixture was reacted for 40 hours while stirring and refluxing. After cooling the reaction solution, the reaction system solidified, and the soluble component was extracted with 20 mL of water. Thereby, a carbon-based light emitting material 6-containing aqueous dispersion was obtained.
- Example 7 A carbon-based light emitting material 7-containing aqueous dispersion was prepared in the same manner as in Example 4 except that 0.7 g (3.3 mmol) of citric acid monohydrate and 0.10 g (0.83 mmol) of L-cysteine were used. Obtained.
- Example 8 An aqueous dispersion containing the carbon-based light emitting material 8 was prepared in the same manner as in Example 4 except that 0.51 g (2.4 mmol) of citric acid monohydrate and 0.29 g (2.4 mmol) of L-cysteine were used. Obtained.
- Example 9 A carbon-based light emitting material 9-containing aqueous dispersion was prepared in the same manner as in Example 4 except that 0.73 g (3.4 mmol) of citric acid monohydrate and 0.28 g (2.3 mmol) of L-cysteine were used. Obtained.
- Example 10 To a 100 mL three-necked flask equipped with a Dimroth condenser and thermometer, citric acid monohydrate 0.51 g (2.4 mmol), L-cysteine 0.29 g (2.4 mmol), SDS 0.80 g (2.8 mmol), In addition, 4 mL of deionized water and 25 mL of toluene were added to prepare a solution. A stirrer and 0.05 g of Amberlyst 15 were added to the resulting solution and reacted for 15 hours while stirring and refluxing. During the reaction, water was removed by a Dean Stark trap. The obtained ocher insoluble matter and ocher solution were filtered through a 0.2 ⁇ m filter to obtain a carbon-based light emitting material 10-containing toluene solution.
- Example 11 In a 50 mL sample bottle, 0.63 g (3.0 mmol) of citric acid monohydrate, 0.37 g (3.0 mmol) of L-cysteine, and 2.0 g of an aqueous dispersion containing the carbon-based luminescent material 2 prepared in Example 2 were used. And 22 mL of deionized water were added to prepare a solution. A stir bar and 0.05 g of Amberlyst 15 were added to the resulting solution, and this was mounted in a Teflon (registered trademark) inner mounted in a stainless steel autoclave and heated to 200 ° C. over 40 minutes. The atmospheric pressure gradually increased and became constant at 0.8 MPa 30 minutes after reaching 200 ° C.
- Teflon registered trademark
- Example 12 An aqueous dispersion containing the carbon-based luminescent material 12 was prepared in the same manner as in Example 4 except that 0.75 g (3.6 mmol) of citric acid monohydrate and 0.05 g (0.41 mmol) of L-cysteine were used. Obtained.
- Example 13 Example 4 except that 0.64 g (3.1 mmol) of citric acid monohydrate and 0.36 g (3.0 mmol) of L-cysteine were used, and 0.05 g of concentrated sulfuric acid was used instead of Amberlyst 15. An aqueous dispersion containing the carbon-based luminescent material 13 was obtained by the same method as described above.
- Example 14 A solution of 0.67 g (3.1 mmol) of citric acid monohydrate and 0.33 g (2.72 mmol) of L-cysteine in 24 mL of deionized water was placed in a 50 mL sample bottle. To the obtained solution, 0.05 g (manufactured by DuPont) of Nafion finely cut into strips having a width of about 1 mm and a length of about 5 mm was added. This was mounted in a Teflon (registered trademark) inner mounted in a stainless steel autoclave and heated to 200 ° C. over 40 minutes. The atmospheric pressure gradually increased and became constant at 0.7 MPa after 30 minutes. The reaction was continued for 90 minutes and allowed to cool to room temperature. The brown precipitate and the solid catalyst were removed with a 0.2 ⁇ m filter to obtain an orange solution. As a result, an aqueous dispersion containing the carbon-based light emitting material 14 was obtained.
- Example 15 A carbon-based light emitting material 15-containing toluene dispersion was obtained in the same manner as in Example 5 except that 25 mL of toluene was used instead of deionized water.
- Example 16 A carbon-based light emitting material 16-containing aqueous dispersion was obtained in the same manner as in Example 13, except that 0.24 g of phosphoric acid was used instead of concentrated sulfuric acid.
- Example 17 To a 100 mL three-necked flask equipped with a Dimroth condenser and a thermometer, 0.20 g (0.95 mmol) of citric acid monohydrate and 0.5 mL (0.56 mmol) of PEG-diamine represented by the following formula (Sigma-Aldrich) Solution) was prepared. A stirrer and 2.0 g of phosphoric acid were added to the obtained solution and reacted at 90 ° C. for 40 hours to obtain a carbon-based light emitting material 17 as a black viscous body.
- PEG-diamine represented by the following formula (Sigma-Aldrich) Solution
- Example 18 An aqueous dispersion containing the carbon-based light emitting material 18 in the same manner as in Example 4 except that 0.54 g (2.6 mmol) of citric acid monohydrate and 0.46 g (3.8 mmol) of L-cysteine were used. Got.
- the carbon-based luminescent material obtained by the method of the present invention showed a high quantum yield.
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Abstract
Description
1.多価カルボン酸を含む原料、酸触媒及び溶媒を混合して、加熱することを特徴とする炭素系発光材料の製造方法。
2.前記多価カルボン酸が、クエン酸である1の炭素系発光材料の製造方法。
3.前記原料が、更に、アミノ基含有化合物を含む1又は2の炭素系発光材料の製造方法。
4.前記アミノ基含有化合物が、アミノ酸である3の炭素系発光材料の製造方法。
5.前記アミノ酸が、システインである4の炭素系発光材料の製造方法。
6.前記酸触媒が、細孔を有する多孔質体不均一酸触媒である1~5のいずれかの炭素系発光材料の製造方法。
7.更に、界面活性剤を混合する1~6のいずれかの炭素系発光材料の製造方法。
8.前記炭素系発光材料がグラフェン構造を有するものである1~7のいずれかの炭素系発光材料の製造方法。
9.前記炭素系発光材料が、波長380~480nmの光を発光するものである1~8のいずれかの炭素系発光材料の製造方法。
(1)蛍光スペクトル:日本分光製(株)FP-6500
(2)量子収率の測定:(株)島津製作所製UV-3600及び日本分光(株)製FP-6500
[実施例1]
ジムロート冷却管及び温度計を装着した100mL三口フラスコに、クエン酸一水和物0.67g(3.1mmol)、L-システイン0.33g(2.72mmol)及び脱イオン水24mLを入れ、溶液を調製した。得られた溶液に、攪拌子及びAmberlyst 15 0.05gを加え、攪拌還流しながら95時間反応させ、炭素系発光材料1含有水分散液を得た。
50mLサンプルビンに、クエン酸一水和物0.67g(3.1mmol)とL-システイン0.33g(2.72mmol)を脱イオン水24mLに溶解した溶液を入れた。得られた溶液に、攪拌子及びAmberlyst 15 0.05gを加えた。これをステンレス製オートクレーブ内に装着したテフロン(登録商標)製インナー内に装着し、40分かけて200℃まで昇温した。気圧が徐々に上昇し、200℃に達してから30分後0.8MPaで一定となった。そのまま30分反応し、室温まで放冷した。褐色沈殿と固体触媒を0.2μmフィルターで除き、淡黄色の溶液を得た。これにより炭素系発光材料2含有水分散液を得た。
100mL三口フラスコに、クエン酸一水和物0.40g(1.9mmol)、L-システイン0.10g(0.8mmol)及び脱イオン水0.5mLを入れ、溶液を調製した。得られた溶液を、ナフィオン0.05g(デュポン社製)に含浸させ、100℃で25時間反応させた。ナフィオンから生成物を水10mLで抽出し、炭素系発光材料3含有水分散液を得た。
50mLサンプルビンに、クエン酸一水和物0.80g(3.8mmol)、L-システイン0.20g(1.7mmol)及び脱イオン水24mLを入れ、溶液を調製した。得られた溶液に、攪拌子及びAmberlyst 15 0.05gを加えた。これをステンレス製オートクレーブ内に装着したテフロン(登録商標)製インナー内に装着し、40分かけて200℃まで昇温した。気圧が徐々に上昇し、30分後0.8MPaで一定となった。そのまま30分反応し、室温まで放冷した。褐色沈殿と固体触媒を0.2μmフィルターで除き、黄色の溶液を得た。これにより、炭素系発光材料4含有水分散液を得た。
50mLサンプルビンに、クエン酸一水和物0.8g(3.8mmol)、L-システイン0.2g(1.7mmol)、SDS2.5g(8.7mmol)及び脱イオン水2.5mLを入れ、溶液を調製した。得られた溶液に、攪拌子及び濃硫酸0.05gを加えた。これをステンレス製オートクレーブ内に装着したテフロン(登録商標)製インナー内に装着し、40分かけて200℃まで昇温した。気圧が徐々に上昇し、30分後0.8MPaで一定となった。そのまま90分反応し、室温まで放冷した。褐色沈殿と固体触媒を0.2μmフィルターで除き、黄土色の溶液を得た。これにより、炭素系発光材料5含有水分散液を得た。
ジムロート冷却管及び温度計を装着した100mL三口フラスコに、クエン酸一水和物0.80g(3.8mmol)、L-システイン0.20g(1.7mmol)、SDS2.5g(8.7mmol)及び脱イオン水2.5mLを入れ、溶液を調製した。得られた溶液に、攪拌子及び濃硫酸0.05gを加え、攪拌還流しながら40時間反応させた。反応液を冷却後、反応系が固化したので水20mLで可溶分を抽出した。これにより、炭素系発光材料6含有水分散液を得た。
クエン酸一水和物を0.7g(3.3mmol)、L-システインを0.10g(0.83mmol)使用した以外は、実施例4と同じ方法で炭素系発光材料7含有水分散液を得た。
クエン酸一水和物を0.51g(2.4mmol)、L-システインを0.29g(2.4mmol)使用した以外は、実施例4と同じ方法で炭素系発光材料8含有水分散液を得た。
クエン酸一水和物を0.73g(3.4mmol)、L-システインを0.28g(2.3mmol)使用した以外は、実施例4と同じ方法で炭素系発光材料9含有水分散液を得た。
ジムロート冷却管及び温度計を装着した100mL三口フラスコに、クエン酸一水和物0.51g(2.4mmol)、L-システイン0.29g(2.4mmol)、SDS0.80g(2.8mmol)、並びに脱イオン水4mL及びトルエン25mLを入れ、溶液を調製した。得られた溶液に、攪拌子及びAmberlyst 15 0.05gを加え、攪拌還流しながら15時間反応させた。反応中、ディーン・スタークトラップにより水を取り除いた。得られた黄土色不溶物と黄土色溶液とを0.2μmフィルターでろ過し、炭素系発光材料10含有トルエン溶液を得た。
50mLサンプルビンに、クエン酸一水和物0.63g(3.0mmol)、L-システイン0.37g(3.0mmol)、実施例2で調製した炭素系発光材料2含有水分散液2.0g、並びに脱イオン水22mLを入れ、溶液を調製した。得られた溶液に、攪拌子及びAmberlyst 15 0.05gを加え、これをステンレス製オートクレーブ内に装着したテフロン(登録商標)製インナー内に装着し、40分かけて200℃まで昇温した。気圧が徐々に上昇し、200℃に達してから30分後0.8MPaで一定となった。そのまま30分反応し、室温まで放冷した。褐色沈殿と固体触媒を0.2μmフィルターで除き、淡黄色の溶液を得た。これにより炭素系発光材料11含有水分散液を得た。
クエン酸一水和物を0.75g(3.6mmol)、L-システインを0.05g(0.41mmol)使用した以外は、実施例4と同じ方法で炭素系発光材料12含有水分散液を得た。
クエン酸一水和物を0.64g(3.1mmol)、L-システインを0.36g(3.0mmol)使用し、Amberlyst 15のかわりに濃硫酸0.05gを使用した以外は、実施例4と同じ方法で炭素系発光材料13含有水分散液を得た。
50mLサンプルビンに、クエン酸一水和物0.67g(3.1mmol)とL-システイン0.33g(2.72mmol)を脱イオン水24mLに溶解した溶液を入れた。得られた溶液に、幅1mm、長さ5mm程度の短冊状に細かく切断したナフィオン0.05g(デュポン社製)を加えた。これをステンレス製オートクレーブ内に装着したテフロン(登録商標)製インナー内に装着し、40分かけて200℃まで昇温した。気圧が徐々に上昇し、30分後0.7MPaで一定となった。そのまま90分反応し、室温まで放冷した。褐色沈殿と固体触媒を0.2μmフィルターで除き、橙色の溶液を得た。これにより、炭素系発光材料14含有水分散液を得た。
脱イオン水のかわりにトルエン25mLを用いた以外は、実施例5と同じ方法で炭素系発光材料15含有トルエン分散液を得た。
濃硫酸のかわりにリン酸0.24gを用いた以外は、実施例13と同じ方法で炭素系発光材料16含有水分散液を得た。
ジムロート冷却管及び温度計を装着した100mL三口フラスコに、クエン酸一水和物0.20g(0.95mmol)、下記式で表されるPEG-ジアミン0.5mL(0.56mmol)(Sigma-Aldrich社製)を入れ、溶液を調製した。得られた溶液に、攪拌子及びリン酸2.0gを加え、90℃で40時間反応させ、黒色粘凋体として、炭素系発光材料17を得た。
クエン酸一水和物を0.54g(2.6mmol)、L-システインを0.46g(3.8mmol)使用した以外は、実施例4と同じ方法で、炭素系発光材料18含有水分散液を得た。
各実施例で得られたポリマーについて、蛍光スペクトル及び量子収率の測定を行った。結果を表1に示す。
Claims (9)
- 多価カルボン酸を含む原料、酸触媒及び溶媒を混合して、加熱することを特徴とする炭素系発光材料の製造方法。
- 前記多価カルボン酸が、クエン酸である請求項1記載の炭素系発光材料の製造方法。
- 前記原料が、更に、アミノ基含有化合物を含む請求項1又は2記載の炭素系発光材料の製造方法。
- 前記アミノ基含有化合物が、アミノ酸である請求項3記載の炭素系発光材料の製造方法。
- 前記アミノ酸が、システインである請求項4記載の炭素系発光材料の製造方法。
- 前記酸触媒が、細孔を有する多孔質体不均一酸触媒である請求項1~5のいずれか1項記載の炭素系発光材料の製造方法。
- 更に、界面活性剤を混合する請求項1~6のいずれか1項記載の炭素系発光材料の製造方法。
- 前記炭素系発光材料がグラフェン構造を有するものである請求項1~7のいずれか1項記載の炭素系発光材料の製造方法。
- 前記炭素系発光材料が、波長380~480nmの光を発光するものである請求項1~8のいずれか1項記載の炭素系発光材料の製造方法。
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| WO2017130999A1 (ja) * | 2016-01-26 | 2017-08-03 | 日産化学工業株式会社 | 炭素系発光材料の製造方法 |
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