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WO2019065461A1 - 銀ナノワイヤの製造法並びに銀ナノワイヤ、銀ナノワイヤインクおよび透明導電膜 - Google Patents

銀ナノワイヤの製造法並びに銀ナノワイヤ、銀ナノワイヤインクおよび透明導電膜 Download PDF

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WO2019065461A1
WO2019065461A1 PCT/JP2018/034866 JP2018034866W WO2019065461A1 WO 2019065461 A1 WO2019065461 A1 WO 2019065461A1 JP 2018034866 W JP2018034866 W JP 2018034866W WO 2019065461 A1 WO2019065461 A1 WO 2019065461A1
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silver
silver nanowire
silver nanowires
alcohol solvent
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王高 佐藤
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Dowa Electronics Materials Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/16—Making metallic powder or suspensions thereof using chemical processes
    • B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
    • B22F9/24—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00—Manufacture or treatment of nanostructures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20—Conductive material dispersed in non-conductive organic material
    • H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
    • H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports

Definitions

  • the present invention relates to a method for producing silver nanowires useful as a conductive material (filler) of a transparent conductive film.
  • the present invention also relates to a silver nanowire, a silver nanowire ink, and a transparent conductive film obtained by the production method.
  • nanowire (s) a fine metal wire having a thickness of about 200 nm or less.
  • Silver nanowires are considered promising as a conductive material for imparting conductivity to transparent substrates.
  • a transparent substrate such as glass, PET (polyethylene terephthalate), PC (polycarbonate), etc.
  • the liquid component is removed by evaporation or the like, the silver nanowires are on the substrate Since a conductive network is formed by contacting each other, a transparent conductive film can be realized.
  • a transparent conductive film used for a touch panel or the like of an electronic device is required to have clear visibility with little haze, in addition to good conductivity.
  • a silver compound is dissolved in a polyol solvent such as ethylene glycol, and in the presence of a halogen compound and an organic protective agent, a linear shape is obtained using the reducing power of the solvent polyol.
  • a method of precipitating metallic silver hereinafter referred to as "alcohol solvent reduction method"
  • organic protective agent PVP (polyvinyl pyrrolidone) has generally been widely used. PVP is a suitable organic protective agent for depositing thin and long silver nanowires.
  • the molecules of the organic protective agent used in the alcohol solvent reduction method adsorb on the surface of the silver nanowire after synthesis, and become a factor governing the dispersibility of the silver nanowire in the liquid medium.
  • Silver nanowires adsorbed with PVP exhibit good dispersibility in water.
  • an organic solvent for example, alcohol
  • PVP is not necessarily a satisfactory organic protective agent.
  • Patent Document 1 is a copolymer having a polymerization composition of vinyl pyrrolidone and Diallyldimethylammonium salt monomer
  • Patent Document 2 is a copolymer of vinyl pyrrolidone and an acrylate based or methacrylate based monomer
  • Patent Document 3 is Vinyl. Copolymers of pyrrolidone and maleimide based monomers are disclosed, respectively. In the alcohol solvent reduction method using these polymers as organic protective agents, it is possible to synthesize thin and long silver nanowires by optimizing the synthesis conditions, as well as or more than using PVP. is there.
  • the silver nanowires used as the conductive material of the transparent conductive coating film have a thin and long form from the viewpoint of achieving both conductivity and visibility at a high level.
  • the wires easily form aggregates in the silver nanowire dispersion liquid, the yield of silver decreases and the handleability in subsequent steps decreases. Not only that, but the aggregates remaining in the final silver nanowire ink cause the reduction in the haze of the transparent conductor and the short circuit in the patterned circuit.
  • the present invention is intended to provide a technology that is particularly effective in stably producing long wires when synthesizing thin silver nanowires by alcohol solvent reduction, and highly effective in suppressing aggregation of the synthesized wires. It is a thing.
  • the above object is achieved in the alcohol solvent reduction method by advancing a precipitation reaction of silver in an environment in which a predetermined concentration of alkyl ether is present in the solvent.
  • the following invention is disclosed in the present specification.
  • a method of producing a silver nanowire the process of reducing and depositing silver in the form of a wire in an alcohol solvent in which a silver compound and an organic protective agent are dissolved, Using a polymer having a vinyl pyrrolidone structural unit as the organic protective agent, A state in which an alkyl ether is dissolved in the alcohol solvent at a concentration of 0.3 to 25.0 mol / L, and the reduction deposition proceeds in the liquid;
  • a M L M / D M (1)
  • L M is a value representing the average length in nm
  • D M is a value representing the average diameter in nm.
  • the polymer is vinyl pyrrolidone, diallyl dimethyl ammonium salt, ethyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 4-hydroxybutyl acrylate, N-methyl maleimide, N-ethyl maleimide, N-propyl [1] to [3] having a polymerization composition with one or more monomers selected from maleimide, N-tert-butyl maleimide, 2-dimethylaminoethyl methacrylate, and 2-diethylaminoethyl methacrylate
  • the manufacturing method of the silver nanowire in any one of.
  • the alkyl ether is a compound of the structural formula R—O—R ′ type having an ether bond at one position.
  • R and R ′ mean an alkyl group represented by the general formula C n H 2n + 1 (n is an integer of 1 or more).
  • This alkyl group is a functional group in the form of removing one hydrogen from an alkane, and is linear or has carbon (tertiary carbon) bonded to the other three carbons.
  • the methyl-t-butyl ether mentioned above as an example of the alkyl ether is sometimes called TBME (tert-butyl methyl ether), and is represented by the symbolic formula (CH 3 ) 3 COCH 3 .
  • the average length, average diameter and average aspect ratio of silver nanowires follow the definitions below.
  • Average length L M The trace length from one end of one silver nanowire to the other end of a silver nanowire is defined as the length of the wire on an image observed by a field emission scanning electron microscope (FE-SEM). A value obtained by averaging the lengths of the individual silver nanowires present on the microscopic image is defined as an average length L M. In order to calculate the average length, the total number of wires to be measured is set to 100 or more. Here, the average length in the stage in which the silver nanowires recovered from the solution after the reduction reaction were washed (stage before being supplied to the purification step such as cross flow filtration) is evaluated.
  • FIG. 4 exemplifies a TEM bright-field observation image (hereinafter referred to as “TEM image”) of silver nanowires according to the present invention.
  • TEM image TEM bright-field observation image
  • Each wire can be considered to have a substantially even thickness over its entire length. Therefore, thickness measurement can be performed by selecting a portion that does not overlap other wires.
  • the diameters of all the wires except for the wires completely overlapping with other wires and whose diameter is difficult to measure are measured.
  • the operation is performed on a plurality of randomly selected fields of view, the diameters of a total of 100 or more different silver nanowires are determined, the average value of the diameters of the individual silver nanowires is calculated, and the value is defined as the average diameter D M.
  • the average aspect ratio AM is calculated by substituting the above average diameter D M and the average length L M into the following equation (1). However, it is assumed that D M and L M to be substituted into the equation (1) are both values expressed in nm.
  • a M L M / D M (1)
  • the present invention in the case of thin silver nanowires having an average diameter of, for example, 35 nm or less, particularly long silver nanowires having an average length of 15 nm or more and an average aspect ratio of 800 or more can be stably synthesized. Since long silver nanowires with an average length as described above can be obtained at the stage of completion of washing after synthesis, if the purification operation to adjust the wire length distribution by cross flow filtration etc. is performed thereafter, the average length will be Longer, high aspect ratio silver nanowires can be manufactured with high yield. When it is used as a conductive material of a transparent conductive film, a transparent conductive film excellent in visibility with less haze can be realized while maintaining high conductivity.
  • the polymer molecule of the organic protective agent In order to deposit metallic silver in the form of a wire by alcohol solvent reduction method, it is necessary for the polymer molecule of the organic protective agent to be selectively adsorbed on the ⁇ 100 ⁇ face of the nucleus crystal that is considered to be multiple twins of silver. It is. Thereby, the growth of the ⁇ 100 ⁇ plane is suppressed, the ⁇ 111 ⁇ plane which is the closest surface of the silver crystal is preferentially grown, and a linear structure of metallic silver is formed.
  • the selective adsorptivity of polymer molecules is believed to be caused by the interaction between the surface potential of the polymer molecules and the surface potential of the silver crystal face.
  • Homopolymers (PVP) and copolymers having vinyl pyrrolidone structural units are known as polymers excellent in selective adsorption to the silver crystal ⁇ 100 ⁇ plane.
  • the structural formula of a vinyl pyrrolidone structural unit is shown in FIG.
  • the inventors have variously studied a method for improving the average length of the synthesized wire particularly when synthesizing a thin silver nanowire using a polymer having a vinyl pyrrolidone structural unit as an organic protective agent.
  • an alkyl ether is extremely effective, in addition to the additives such as the halide generally used conventionally.
  • Alkyl ethers have the function of cleaning the ⁇ 111 ⁇ crystal face on which silver preferentially precipitates when synthesizing silver nanowires by the alcohol solvent reduction method, that is, the organic protective agent molecules on the ⁇ 111 ⁇ crystal face. It is thought that it has an effect of suppressing adsorption and activating the exposed ⁇ 111 ⁇ crystal face to promote the deposition of new silver.
  • the action to activate the ⁇ 111 ⁇ crystal face is mainly borne by the conventional additives such as halides, but it is presumed that the alkyl ether also acts in a similar manner.
  • the presence of the alkyl ether in addition to the halogen in the vicinity of the previously deposited linear structure of metallic silver increases the effect of the cleaning, and the thickness direction surface of the linear structure ( ⁇ 100 ⁇ crystal plane)
  • the relative ease of deposition on the lengthwise exposed surface ( ⁇ 111 ⁇ crystal plane) relative to the ease of deposition of silver on silver is further enhanced, resulting in silver nanowires having a large average aspect ratio. It is considered that the synthesis becomes easy.
  • the alkyl ether concentration increases, the effect of improving the average length of the silver nanowires becomes saturated.
  • the amount ratio of the alkyl ether in the liquid is, for example, 1 mol of the polymer having a vinylpyrrolidone structural unit, which is an organic protective agent, in terms of the quantitative ratio to the organic protective agent present in the alcohol solvent at the time of the reductive deposition reaction. It is preferable to adjust in the range of 003 to 0.30 mol. Also, in terms of the amount ratio to silver, it is possible to adjust the existing amount of alkyl ether in the solution in the range of 0.005 to 0.50 mol at the time of reaction disclosure with respect to 1 mol of the total amount of silver used for the reaction. preferable.
  • alkyl ether examples include ethyl methyl ether (CH 3 CH 2 OCH 3 ), methyl t-butyl ether ((CH 3 ) 3 COCH 3 ), ethyl isoamyl ether ((CH 3 ) 2 CHCH 2 CH 2 OC 2 H 5 ), ethyl-t-butyl ether ((CH 3 ) 3 COC 2 H 5 ), diisoamyl ether ((CH 3 ) 2 CHCH 2 CH 2 OCH 2 CH 2 CH (CH 3 ) 2 ), diisopropyl ether ((CH 3 ) 3 ) 2 CHOCH (CH 3 ) 2 ), diethyl ether (C 2 H 5 OC 2 H 5 ), dibutyl ether (C 4 H 9 OC 4 H 9 ), dipropyl ether (C 3 H 7 OC 3 H 7 ) , dimethyl ether (CH 3 OCH 3), ethylene glycol monomethyl ether (CH 3 OCH 2 CH 2 ),
  • PVP polyvinylpyrrolidone
  • a copolymer of vinylpyrrolidone and a hydrophilic monomer is a suitable target.
  • the latter copolymers include, for example, vinyl pyrrolidone and diallyl dimethyl ammonium salt, ethyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 4-hydroxybutyl acrylate, N-methyl maleimide, N-ethyl maleimide, N- Examples include copolymers having a polymerization composition with one or more monomers selected from propyl maleimide and N-tert-butyl maleimide.
  • the polymerization composition of the copolymer is preferably 0.1 to 10% by weight of monomers other than vinyl pyrrolidone, with the balance being vinyl pyrrolidone.
  • the weight average molecular weight Mw of the polymer used for the organic protective agent is preferably in the range of 30,000 to 300,000, and more preferably in the range of 30,000 to 150,000. Mw can be determined by GPC (gel permeation chromatography).
  • the silver nanowire is preferably as thin and long as possible from the viewpoint of forming a transparent conductive coating film excellent in conductivity and visibility.
  • an object having an average length of 15 ⁇ m or more, an average diameter of 35 nm or less, and an average aspect ratio of 800 or more according to the equation (1) is suitable. It is more preferable that the average length is 15 ⁇ m or more and the average diameter is 33 nm or less. It is more preferable that the average length is 15 ⁇ m or more and the average diameter is 30 nm or less.
  • silver nanowires having a long average length and a large average aspect ratio can be obtained in the synthesis stage, so that the length distribution can be efficiently adjusted at a high yield, for example, by cross flow purification in the subsequent steps. Can.
  • silver nitrate, silver acetate, silver oxide, silver chloride and the like can be mentioned, but silver nitrate (AgNO 3 ) is easy to use in consideration of the solubility in a solvent and the cost.
  • silver compound the organic protective agent and the alkyl ether
  • reduction deposition may be allowed to proceed in an alcohol solvent in which an alkali metal hydroxide or aluminum salt is dissolved.
  • an alcohol solvent to which an alkyl ether is added can be applied.
  • Comparative Example 1 (Organic protective agent) A copolymer powder was prepared by dissolving 1-vinyldipyrrolidone and diallyldimethylammonium nitrate in a solvent, methyl isobutyl ketone, as a solvent, and copolymerizing by adding a polymerization initiator.
  • the 1 H NMR spectrum of the copolymer powder was measured by nuclear magnetic resonance spectroscopy (NMR) with JNM-LA400 (400 MHz) manufactured by JEOL Ltd., and the components contained in the powder were examined.
  • NMR nuclear magnetic resonance spectroscopy
  • JNM-LA400 400 MHz
  • VP vinyl pyrrolidone
  • ethyl acetate uses the integral value of the peak around 4.1 ppm
  • methyl-t-butyl ether uses the integral value of the peak around 1.2 ppm
  • methyl isobutyl ketone uses the integral value of the peak around 0.9 ppm
  • the mole% of each component was calculated.
  • the residual VP amount was determined by the following equation (2).
  • VP R (mol%) [2 ⁇ (I 1 + I 2 ) / (3 ⁇ I 3 )] ⁇ 100 (2)
  • I 3 is the integral value of the peak (3.0-3.4ppm) derived from the methylene protons adjacent to the N atom of the polymer.
  • the weight average molecular weight Mw of the above copolymer was determined by GPC (gel permeation chromatography) under the following conditions.
  • ⁇ Device HLC-8320GPC EcoSEC (made by Tosoh Corporation)
  • Column TSKgel GMPWXL ( ⁇ 2) + G2500PWXL
  • Flow rate 1.0 mL / min
  • Temperature 40 ° C
  • Injection volume 200 ⁇ L -Multi-angle light scattering detector: DAWN HELEOS II (manufactured by Wyatt Technology) Refractive index (RI) detector: Optilab T-rEX (manufactured by Wyatt Technology)
  • the weight average molecular weight Mw was 89,078.
  • the above solution A is put in a reaction vessel and heated from normal temperature to 95 ° C. with stirring at a rotational speed of 250 rpm, and then the whole solution B is added to solution A using a tube pump from two addition ports. Added over a minute.
  • 4 g of a propylene glycol solution is added using a tube pump in order to wash out the inside of the tube to which solution B adheres, and then it is kept stirring at 95 ° C. for 3.5 hours. Cooled to 0 C over 2.0 hours and held at 85 0 C for 19 hours.
  • the reaction liquid of the stage cooled to normal temperature containing the synthesized silver nanowire is referred to as “post-synthesis reaction liquid” (the same in each of the following examples).
  • the dispersion In measuring the length of silver nanowires, the dispersion is placed on an observation table for SEM, water is volatilized on the observation table, and then a field emission scanning electron microscope (manufactured by Hitachi High-Technologies Corporation; S-4700) The observation was performed at an acceleration voltage of 3 kV and a magnification of 1,500. For three or more randomly selected fields of view, the average length was measured according to the above definition using software (Dr. Kampas) for all wires whose full length can be confirmed within the field of view.
  • the dispersion was placed on an observation table for TEM, and bright field images were observed at an acceleration voltage of 100 kV and a magnification of 40,000 with a transmission electron microscope (manufactured by JEOL Ltd .; JEM-1011).
  • the observation image is taken, and the original image taken to accurately measure the diameter is enlarged to twice the size, and then using software (Motic Image Plus 2.1 S), the average diameter is determined according to the above definition. It was measured.
  • the average aspect ratio was determined by substituting the values of the average length and the average diameter into the equation (1).
  • the average diameter of the silver nanowires was 26.7 nm, and the average length was 20.5 ⁇ m.
  • the average aspect ratio was 20500 (nm) /26.7 (nm) ⁇ 768.
  • Table 1 The results are summarized in Table 1 together with other examples and comparative examples.
  • Example 1 Comparative Example 1 was carried out except that, in addition to each of the substances mixed in Comparative Example 1, 0.0263 g of methyl-t-butyl ether was used as solution A when synthesizing silver nanowires.
  • the experiment was performed under the same conditions as in.
  • the concentration of methyl-t-butyl ether in the alcohol solvent at the initiation of the precipitation reaction of silver (ie, the initiation of the addition of solution B) is 0.598 mmol / L.
  • the average diameter of silver nanowires obtained under this condition was 28.4 nm, and the average length was 23.3 ⁇ m.
  • the average aspect ratio was 23300 (nm) /28.4 (nm) ⁇ 820.
  • Example 2 Comparative Example 1 was carried out except that, in addition to the respective substances mixed in Comparative Example 1, 0.0798 g of methyl-t-butyl ether was further mixed and dissolved as solution A when synthesizing silver nanowires.
  • the experiment was performed under the same conditions as in.
  • the concentration of methyl-t-butyl ether in the alcohol solvent at the initiation of precipitation reaction of silver (ie, the initiation of addition of solution B) is 1.811 mmol / L.
  • the average diameter of the silver nanowire obtained under this condition was 27.8 nm, and the average length was 24.5 ⁇ m.
  • the average aspect ratio was 24500 (nm) /27.8 (nm) ⁇ 881.
  • Comparative Example 1 was carried out except that, in addition to the respective substances mixed in Comparative Example 1, 0.1344 g of methyl-t-butyl ether was used as solution A in synthesizing silver nanowires. The experiment was performed under the same conditions as in.
  • the methyl-t-butyl ether concentration in the alcohol solvent at the initiation of the precipitation reaction of silver (ie, the initiation of the addition of solution B) is 3.049 mmol / L.
  • the average diameter of silver nanowires obtained under this condition was 27.7 nm, and the average length was 22.7 ⁇ m.
  • the average aspect ratio was 22700 (nm) /27.7 (nm) ⁇ 819.
  • Example 4 Comparative Example 1 was carried out except that, as the solution A, 0.4250 g of methyl-t-butyl ether was further mixed and dissolved in addition to the respective materials mixed in Comparative Example 1 when synthesizing silver nanowires.
  • the experiment was performed under the same conditions as in.
  • the concentration of methyl-t-butyl ether in the alcohol solvent at the initiation of the precipitation reaction of silver (ie, the initiation of the addition of solution B) is 9.643 mmol / L.
  • the average diameter of silver nanowires obtained under this condition was 27.0 nm, and the average length was 24.5 ⁇ m.
  • the average aspect ratio was 24500 (nm) /27.0 (nm) 907 907.
  • Comparative Example 1 was carried out except that, in addition to the respective materials mixed in Comparative Example 1, 0.5825 g of methyl-t-butyl ether was further mixed and dissolved as solution A when synthesizing silver nanowires.
  • the experiment was performed under the same conditions as in.
  • the concentration of methyl-t-butyl ether in the alcohol solvent at the initiation of the precipitation reaction of silver (ie, the initiation of the addition of solution B) is 13.215 mmol / L.
  • the average diameter of the silver nanowire obtained under this condition was 27.0 nm, and the average length was 26.2 ⁇ m.
  • the average aspect ratio was 26200 (nm) /27.0 (nm) 970 970.
  • the presence of the alkyl ether in the alcohol solvent at the time of silver nanowire synthesis can significantly improve the average length of the synthesized wire and, accordingly, the average aspect ratio of the wire also improves. Do.
  • FIG. 2 For reference, a SEM photograph of the silver nanowire obtained in Comparative Example 1 is shown in FIG. 2, and a SEM photograph of the silver nanowire obtained in Example 5 is shown in FIG.
  • the measurement conditions were an LPF measurement mode, a quantitative count mode, and 10 repeated measurements. Further, the maximum length limitation range is 10 to 300 ⁇ m, and the average luminance value limitation range is 0 to 40.
  • Ten measured values were integrated, and the number of aggregates per 55 ⁇ L of the silver nanowire-containing solution was taken as the number of aggregates counted in the silver nanowire-containing solution. Table 2 shows the results.
  • the presence of the alkyl ether in the alcohol solvent at the time of silver nanowire synthesis is effective not only to improve the average aspect ratio of the silver nanowires to be synthesized but also to suppress aggregation of the wires.

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PCT/JP2018/034866 2017-09-26 2018-09-20 銀ナノワイヤの製造法並びに銀ナノワイヤ、銀ナノワイヤインクおよび透明導電膜 Ceased WO2019065461A1 (ja)

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