WO2014189149A1 - 金属ナノワイヤの製造方法及び金属ナノワイヤ並びに銀ナノワイヤの製造方法及び銀ナノワイヤ - Google Patents
金属ナノワイヤの製造方法及び金属ナノワイヤ並びに銀ナノワイヤの製造方法及び銀ナノワイヤ Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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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
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/054—Nanosized particles
- B22F1/0547—Nanofibres or nanotubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/06—Metallic powder characterised by the shape of the particles
- B22F1/062—Fibrous particles
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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
- B22F1/07—Metallic powder characterised by particles having a nanoscale microstructure
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- 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
- B22F2009/245—Reduction reaction in an Ionic Liquid [IL]
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2301/00—Metallic composition of the powder or its coating
- B22F2301/25—Noble metals, i.e. Ag Au, Ir, Os, Pd, Pt, Rh, Ru
- B22F2301/255—Silver or gold
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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
- B22F2304/00—Physical aspects of the powder
- B22F2304/05—Submicron size particles
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- 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
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- 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
Definitions
- the present invention relates to a metal nanowire manufacturing method, a metal nanowire manufactured by the method, a silver nanowire manufacturing method, and a silver nanowire manufactured by the method.
- the metal nanowire is a metal having a diameter of nanometer order size, and is a conductive material having a wire shape (linear shape). Since the conductive layer (thin film) formed of the metal nanowire has high conductivity and light transmittance, it is used, for example, as a transparent electrode material for a touch panel.
- Patent Document 1 As a method for producing such metal nanowires, for example, in Patent Document 1 below, a metal salt, polyvinylpyrrolidone, chloride or nitrate, and one or more selected from the group consisting of ethylene glycol and propylene glycol are mixed. Techniques to do this are disclosed.
- An object of the present invention is to provide a method for producing a metal nanowire capable of producing a thin and long metal nanowire, a metal nanowire produced thereby, a method for producing a silver nanowire, and a silver nanowire produced thereby.
- one embodiment of the present invention is a method for producing metal nanowires, wherein at least one selected from metal salts, polymers, halides, sulfides, carbonates and sulfates. And a step of heating and reacting at a temperature of 100 to 250 ° C. for 10 minutes or more in a state where the simple shear stress acting on the solution is 10 mPa ⁇ m or less. Changes in the ultraviolet / visible absorption spectrum of the solution are measured during the reaction process, and the reaction time is controlled based on the ultraviolet / visible absorption spectrum information.
- the metal for producing the metal nanowire is preferably one or more selected from the group consisting of gold, silver, copper, platinum, palladium, ruthenium, cobalt, nickel, molybdenum, indium, iridium and titanium, These metal salts are used. As the salt, nitrates, organic carboxylates, metal alkoxides, and metal phenoxides that are highly soluble in the aliphatic alcohol used are suitable.
- the polymer is at least one selected from the group consisting of polyvinyl pyrrolidone, poly N-vinyl acetamide, poly N-vinyl formamide, polyvinyl caprolactam, and polyacrylamide, and polyvinyl pyrrolidone is particularly preferable.
- the halides are NaCl, CoCl 2 , SnCl 4 , CuCl 2 , NiCl 2 , FeCl 3 , ZnCl 2 , NaBr, NaI, KBr, KI and R 4 NCl, R 4 NBr, R 4 NI
- R is carbon
- the sulfide is selected from the group consisting of Na 2 S and K 2 S
- the carbonate is Na 2 CO is selected from 3 the group consisting of K 2 CO 3
- the sulfate, Na 2 SO 4 and K 2 SO 4 may be selected from the group consisting of.
- the quaternary ammonium salt is more preferably one in which R is a normal alkyl group from the viewpoint of availability.
- the aliphatic alcohol preferably dissolves at least one selected from the metal salts, added halides, sulfides, carbonates and sulfates and has a boiling point of 100 ° C. or higher, and has a shear stress.
- the viscosity is preferably low, and at least the viscosity of the aliphatic alcohol itself is preferably 10 Pa ⁇ s or less at 25 ° C.
- the concentration of the halide, sulfide, carbonate and sulfate is 1 ⁇ 10. It is preferably ⁇ 8 to 1 ⁇ 10 ⁇ 2 M.
- the ultraviolet / visible absorption spectrum of the solution was measured during the heating step, and the ratio of the absorption intensity (A420) at 420 nm to the absorption intensity (A350) at 350 nm (A420 nm / A350 nm) did not exceed 2.
- the reaction is preferably stopped when the absorption intensity at 380 nm (A380) does not become less than half of the peak.
- another embodiment of the present invention is a metal nanowire manufactured by the above-described method for manufacturing a metal nanowire.
- the metal nanowire is preferably a silver nanowire.
- a thin and long metal nanowire can be manufactured.
- SEM scanning electron microscope
- a method for producing a metal nanowire prepares a solution containing a metal salt, a polymer, at least one selected from halide, sulfide, carbonate and sulfate, and an aliphatic alcohol.
- a metal salt a polymer
- One feature is that it includes a step of heating and reacting at a temperature of 100 to 250 ° C. for 10 minutes or longer in a state where the simple shear stress acting on the solution is 10 mPa ⁇ m or less. The simple shear stress will be described later.
- the solution preparation in the above step is performed by mixing a first solution containing a polymer and a metal salt with a second solution containing at least one selected from halides, sulfides, carbonates and sulfates. Can do.
- an aliphatic alcohol is included as the solvent of the first solution and the solvent of the second solution.
- a solution may be prepared by mixing a salt of the metal, a polymer, at least one selected from halides, sulfides, carbonates and sulfates, and an aliphatic alcohol. The order of mixing is not particularly limited as long as a uniform solution can be finally prepared.
- the polymer must be dissolved in the aliphatic alcohol to be used, specifically, at least selected from the group consisting of polyvinyl pyrrolidone, poly N-vinyl acetamide, poly N-vinyl formamide, polyvinyl caprolactam, and polyacrylamide. It is a kind, and polyvinylpyrrolidone is particularly preferable. These polymers contribute to wire growth. If the polymer is not present, it can hardly grow into a wire shape, and most of the polymer is produced as an agglomerated powder having an amorphous shape.
- the above aliphatic alcohol acts as a metal salt reducing agent.
- the hydroxyl group of the aliphatic alcohol is used for the reduction of the metal salt.
- the aliphatic alcohol must be capable of dissolving metal salts, halides, sulfides, carbonates and sulfates used as raw materials, and has a boiling point at 1 atm from the reaction (reduction) temperature described later.
- the viscosity is preferably high (100 ° C. or higher), and in order to lower the shear stress, the viscosity is preferably low.
- At least the viscosity of the aliphatic alcohol itself is preferably 10 Pa ⁇ s or less at 25 ° C., 1.5 Pa ⁇ S or less is more preferable, 200 mPa ⁇ s or less is more preferable, and 50 mPa ⁇ s or less is particularly preferable.
- the simple shear stress acting on the solution (reaction solution) mixed with a group alcohol is 10 mPa ⁇ m or less, more preferably 5 mPa ⁇ m or less, and even more preferably 2 mPa ⁇ m or less, at a temperature of 100 to 250 ° C. Heat and react for more than a minute.
- the reaction rate is low when an aliphatic alcohol is used as the reducing agent, and thus the productivity is low and is not preferable. Thereby, since the shear stress which acts on the metal nanowire to produce
- the metal constituting the metal salt is selected from the group consisting of gold, silver, copper, platinum, palladium, ruthenium, cobalt, nickel, molybdenum, indium, iridium and titanium from the viewpoints of resistance and transparency.
- gold, silver and copper are more preferable in consideration of the resistance value.
- the halides, sulfides, carbonates and sulfates can be selected from metal halides, sulfides, carbonates and sulfates that have a higher ionization tendency than the metal to be produced.
- Halides include NaCl, CoCl 2 , SnCl 4 , CuCl 2 , NiCl 2 , FeCl 3 , ZnCl 2 , NaBr, NaI, KBr, KI and R 4 NCl, R 4 NBr, R 4 NI (R is 1 carbon number) Quaternary ammonium salts represented by (12 to 12), Na 2 S, K 2 S as sulfides, Na 2 CO 3 , K 2 CO 3 as carbonates, Na 2 SO as sulfates 4 and K 2 SO 4 can be exemplified.
- metal halides, sulfides, carbonates and sulfates which have a higher ionization tendency than the metal to be produced, contribute to metal wire precipitation and wire growth when the metal salts are reduced. . If they do not exist, they can hardly be grown in the form of wires, and most of them are produced as amorphous aggregated powder.
- the concentration of the polymer is preferably 0.001 to 0.5M as the concentration after mixing the first solution and the second solution when one or more selected from the group of aliphatic alcohols is used as a solvent. 005 to 0.3M is more preferable, and 0.01 to 0.1M is more preferable. If the concentration is too low, nanowires will not be formed, and if it is too high, the polymer will remain excessively in the nanowires, which hinders the reduction in resistance.
- the polymer concentration M (mol / L) means a value converted in terms of monomer units.
- the concentration after mixing the first solution and the second solution is 0.0001 to 0.5 M (M Is preferably mol / L), more preferably 0.0005 to 0.1M, and still more preferably 0.001 to 0.05M. If the salt concentration is too high, the nanowire becomes thick, and if it is too low, the reaction rate is slow and the productivity is lowered.
- the polymer for example, a commercially available product having a weight average molecular weight of 10,000 to 1,200,000 can be used. If the molecular weight is too low, the ability to generate nanowires tends to deteriorate. On the other hand, if the molecular weight is too high, the solution viscosity becomes high, which is not preferable.
- the concentration selected from the halide, sulfide, carbonate, and sulfate is at least one selected from the group consisting of silver as the metal and ethylene glycol and propylene glycol as the aliphatic alcohol.
- the final solution is preferably 1 ⁇ 10 ⁇ 8 to 1 ⁇ 10 ⁇ 2 M (M means mol / L) in consideration of the ratio with the metal salt, and 2 ⁇ 10 ⁇ 8 to 5 more preferably from ⁇ 10 -3 M, and even more preferably 3 ⁇ 10 -8 ⁇ 3 ⁇ 10 -3 M. If the concentration is too low, there is no effect of reducing the wire diameter, and if it is too high, the ratio of reducing the metal used in combination is not negligible for the metal wire to be produced, which is not preferable.
- the molar mixing ratio of the metal salt, polymer, (halide, sulfide, carbonate and sulfate) and aliphatic alcohol is, for example, 1: 0.05 to 15: 1 ⁇ 10 ⁇ 7 to 2 ⁇ 10 ⁇ 2 : 200 to 9000, preferably 1: 0.5 to 10: 1 ⁇ 10 ⁇ 4 to 2 ⁇ 10 ⁇ 2 : 300 to 8000, more preferably 1: 1 to 10: 2. ⁇ 10 ⁇ 3 to 1 ⁇ 10 ⁇ 2 : 400 to 7000.
- the solution containing a polymer and the solution containing a metal salt may be separately prepared, and the first solution may be prepared by mixing these solutions.
- the solvent of the solution containing the polymer and the solvent of the solution containing the metal salt are at least one selected from the group consisting of the aliphatic alcohols.
- the metal nanowire manufactured in the manufacturing method of the present embodiment has a diameter of 200 nm or less and a length in the range of 10 ⁇ m or more. However, if it is too thin, there is anxiety even at practical strength, so 1 nm or more is preferable, and 5 nm or more is more preferable.
- the metal salt is preferably AgNO 3 from the viewpoint of solubility.
- the metal salt is AgNO 3
- the halide is NaCl, CoCl 2 , SnCl 4 , CuCl 2 , NiCl 2 , FeCl 3 , ZnCl 2 , and R 4 NCl (R is the number of carbon atoms)
- a chloride such as a quaternary ammonium salt represented by:
- the metal nanowire is manufactured under a low shear stress.
- the shear stress is strong, the generated nanowire is easily broken, and amorphous Ag particles derived from the broken wire or by-produced are mixed. If used in this state, the transparent conductive film will have a high haze and low transparency, so it is necessary to separate the nanowires from the amorphous particles. It is necessary and purification is not easy.
- the reaction solution used in this case needs to be almost a Newtonian fluid, and this can also be verified by confirming that the viscosity is not affected by the shear rate in advance.
- the viscosity of the reaction solution is measured at, for example, 6 rpm and 60 rpm, and if the viscosity ratio is about 1, the reaction solution is almost Newton. Judged to be fluid.
- liquid A is the first solution (metal salt, polymer, aliphatic alcohol)
- liquid B is selected from the second solution (halide, sulfide, carbonate, and sulfate). At least one kind of aliphatic alcohol).
- a metal salt and a halide, sulfide, carbonate and sulfate is not allowed to coexist. When both coexist, the reaction starts to proceed before reaching the target temperature during the temperature rise, and the shape of the nanowire may become uneven.
- Liquid A and liquid B are separately prepared in advance, preheated to the reaction temperature with preheaters 10a and 10b, mixed in a microreactor or tubular reactor under a low shear stress, and placed in a reactor 12 heated to the reaction temperature. Aged.
- reaction can be performed at a slow circulation rate using a loop reactor.
- reaction Preparation of the solution) at a temperature at which the reaction does not proceed (for example, room temperature), and then the reaction solution is reacted under a condition that the simple shear stress is 10 mPa ⁇ m or less, more preferably 5 mPa ⁇ m or less, and even more preferably 2 mPa ⁇ m or less.
- the reaction can be carried out for a predetermined time by heating to a temperature.
- this embodiment is characterized by observing the ultraviolet / visible absorption spectrum of the reaction solution during the reaction.
- the ultraviolet / visible absorption spectrum based on the nanowire is hardly observed, but in the case of Ag, the ultraviolet / visible absorption spectrum of the nanowire is observed at 350 to 370 nm as the reaction proceeds, and the spectrum of the nanoparticle is 420 nm. Observed nearby.
- a broad peak having a peak around 380 to 389 nm also appears as a reaction mixture.
- the absorption intensity ratio of 420 nm / 350 nm is calculated with the growth of the nanowire, and is at least 2 or less, usually 1.5 or less, and the peak intensity at 380 nm increases.
- the absorption intensity at 380 nm is further reduced to less than half of the peak before the ratio of the peaks at 420 nm and 350 nm exceeds 2, more preferably before 1.5.
- the peak intensity varies depending on the concentration of the metal salt, so it is preferable to observe continuously. However, if the concentration to be implemented in the manufacturing process is determined industrially, the peak intensity is reacted at a preset concentration. The change in the ultraviolet / visible absorption spectrum of the reaction solution over time can be tracked, and the maximum value of the absorption intensity obtained as a result can be used as an index.
- the composition of the reaction solution such as the type and concentration of the metal salt used, is different from that of Ag, so the wavelength to be noted changes.
- the reaction time can be controlled from the ultraviolet / visible absorption spectrum information of the liquid.
- reaction solution A reaction solution for carrying out the reaction using the apparatus schematically shown in Fig. 1 was prepared as follows.
- Preparation of solution A 1 g of polyvinylpyrrolidone (manufactured by Nippon Shokubai Co., Ltd., weight average molecular weight 1.1 million) and 1.25 g of silver nitrate (reagent manufactured by Wako Pure Chemical Industries, Ltd.) were dissolved in 500 g of ethylene glycol.
- Liquid A and liquid B prepared as described above were mixed with a magnetic stirrer in a beaker at room temperature, and the viscosities at 20 ° C., 40 ° C., and 60 ° C. were measured, and 1 / T (T is an absolute temperature) and The viscosity at high temperature was estimated by plotting the logarithm of viscosity. The measured values and estimated values of the viscosity are shown in Table 1 below.
- An oil bath in which the liquid mixture of liquid A and liquid B is put into a separable cylindrical 1 liter flask with an inner diameter of 12 cm with a three-necked upper lid, and is set at a predetermined temperature while stirring with a three-one motor with a Dimroth cooler. And heated.
- the simple shear stress [mPa ⁇ m] (peripheral linear velocity [m / s] ⁇ viscosity ⁇ [mPa ⁇ s]) was calculated from the inner diameter of 12 cm, the rotation speed of the three-one motor, and the above viscosity.
- Table 2 shows the calculated simple shear stress at each rotation number at 150 ° C.
- Fig. 2 shows the ultraviolet / visible absorption spectrum of each reaction solution reacted at 150 ° C for 1 hour while changing the simple shear stress.
- Table 3 shows the absorption intensity ratios of 420 nm and 350 nm obtained from these ultraviolet / visible absorption spectra.
- FIG. 3A shows a case where the simple shear stress is 0.17 mPa ⁇ m
- FIG. 3B shows a case where the simple shear stress is 1.7 mPa ⁇ m
- FIG. 3C shows a simple case. This is the case where the shear stress is 5.1 mPa ⁇ m
- FIG. 3D shows the case where the simple shear stress is 10.2 mPa ⁇ m.
- FIG. 4 shows the time-dependent change of the ultraviolet and visible absorption spectrum of the reaction solution when the simple shear stress is 150 ° C. and 1.7 mPa ⁇ m.
- Table 4 shows the relationship between the absorption intensity at 380 nm and the absorption intensity ratio at 420 nm and 350 nm for each reaction time determined from these ultraviolet / visible absorption spectra.
- FIG. 5A and 5B show scanning electron microscope (SEM) images of Ag nanowires generated at reaction times of 1.5 hours and 3 hours, respectively.
- FIG. 5 (a) shows a reaction time of 1.5 hours
- FIG. 5 (b) shows a reaction time of 3 hours. It can be seen that after 3 hours, particulate by-products are observed. This is considered to be because the reaction was continued until the absorption intensity at 380 nm obtained from the ultraviolet / visible absorption spectrum reached a peak value (absorption intensity when the reaction time was 1 hour) or less (0.42).
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Abstract
Description
上記ポリマーは、ポリビニルピロリドン、ポリN-ビニルアセトアミド、ポリN-ビニルホルムアミド、ポリビニルカプロラクタム、ポリアクリルアミドからなる群より選択される少なくとも一種であり、特にポリビニルピロリドンが好ましい。
図1に概略を示した装置を用いて反応を行うための反応液を以下の通り調製した。
A液の調製:エチレングリコール500gにポリビニルピロリドン((株)日本触媒製 重量平均分子量110万)1g、硝酸銀(和光純薬工業(株)製試薬)1.25gを溶解した。
B液の調製:塩化第二鉄(和光純薬工業(株)製試薬特級)9.16mgをエチレングリコール(和光純薬工業(株)製試薬特級)17gに溶解した。
Claims (17)
- 金属の塩と、ポリマーと、ハロゲン化物、硫化物、炭酸塩および硫酸塩から選択される少なくとも一種と、脂肪族アルコールとを含む溶液を調製する工程と、前記溶液に作用する簡易剪断応力を10mPa・m以下の状態で100~250℃の温度で10分以上加熱・反応する工程とを含み、前記加熱・反応工程中に溶液の紫外・可視吸収スペクトル変化を測定し、その紫外・可視吸収スペクトル情報をもとに反応時間を制御することを特徴とする金属ナノワイヤの製造方法。
- 前記金属が、金、銀、銅、白金、パラジウム、ルテニウム、コバルト、ニッケル、モリブデン、インジウム、イリジウムおよびチタンからなる群から選択される1以上である請求項1に記載の金属ナノワイヤの製造方法。
- 前記金属の塩が硝酸塩、有機カルボン酸塩、金属アルコキシド、金属フェノキシドからなる群から選択される1以上である請求項1または請求項2に記載の金属ナノワイヤの製造方法。
- 前記ポリマーがポリビニルピロリドン、ポリN-ビニルアセトアミド、ポリN-ビニルホルムアミド、ポリビニルカプロラクタム、ポリアクリルアミドからなる群より選択される少なくとも一種である請求項1から請求項3のいずれかに記載の金属ナノワイヤの製造方法。
- 前記脂肪族アルコールの1気圧での沸点が100℃以上、粘度が25℃で10Pa・s以下である請求項1から請求項4のいずれかに記載の金属ナノワイヤの製造方法。
- 前記ハロゲン化物は、NaCl、CoCl2、SnCl4、CuCl2、NiCl2、FeCl3、ZnCl2、NaBr、NaI、KBr、KIおよびR4NCl、R4NBr、R4NI(Rは炭素数が1~12のアルキル基)に示される4級アンモニウム塩からなる群から選択され、前記硫化物が、Na2SおよびK2Sからなる群から選択され、前記炭酸塩が、Na2CO3およびK2CO3からなる群から選択され、前記硫酸塩が、Na2SO4およびK2SO4からなる群から選択され、前記硝酸塩が、NaNO3、NiNO3、CoNO3およびFe2(NO3)3からなる群から選択される請求項1から請求項5のいずれかに記載の金属ナノワイヤの製造方法。
- 前記金属が銀であり、前記脂肪族アルコールがエチレングリコールおよびプロピレングリコールからなる群から選択される1以上であり、かつ前記ハロゲン化物、硫化物、炭酸塩および硫酸塩から選択される少なくとも一種の濃度が1×10-8~1×10-2Mである請求項1から請求項6のいずれかに記載の金属ナノワイヤの製造方法。
- 前記加熱工程中に溶液の紫外・可視吸収スペクトルを測定し、350nmでの吸収強度(A350)に対する420nmでの吸収強度(A420)の比率(A420nm/A350nm)が2を超えず、かつ、380nmでの吸収強度(A380)がピーク時の半分以下にならない時点で反応を停止することを特徴とする請求項7に記載の金属ナノワイヤの製造方法。
- 請求項1から請求項8のいずれかに記載の金属ナノワイヤの製造方法により製造した金属ナノワイヤ。
- 銀の塩と、ポリマーと、ハロゲン化物、硫化物、炭酸塩および硫酸塩から選択される少なくとも一種と、脂肪族アルコールとを含む溶液を調製する工程と、前記溶液に作用する簡易剪断応力を10mPa・m以下の状態で100~250℃の温度で10分以上加熱・反応する工程とを含み、前記加熱・反応工程中に溶液の紫外・可視吸収スペクトル変化を測定し、その紫外・可視吸収スペクトル情報をもとに反応時間を制御することを特徴とする銀ナノワイヤの製造方法。
- 前記銀の塩が硝酸塩、有機カルボン酸塩、銀アルコキシド、銀フェノキシドからなる群から選択される1以上である請求項10に記載の銀ナノワイヤの製造方法。
- 前記ポリマーがポリビニルピロリドン、ポリN-ビニルアセトアミド、ポリN-ビニルホルムアミド、ポリビニルカプロラクタム、ポリアクリルアミドからなる群より選択される少なくとも一種である請求項10または請求項11に記載の銀ナノワイヤの製造方法。
- 前記脂肪族アルコールの1気圧での沸点が100℃以上、粘度が25℃で10Pa・s以下である請求項10から請求項12のいずれかに記載の銀ナノワイヤの製造方法。
- 前記ハロゲン化物は、NaCl、CoCl2、SnCl4、CuCl2、NiCl2、FeCl3、ZnCl2、NaBr、NaI、KBr、KIおよびR4NCl、R4NBr、R4NI(Rは炭素数が1~12のアルキル基)に示される4級アンモニウム塩からなる群から選択され、前記硫化物が、Na2SおよびK2Sからなる群から選択され、前記炭酸塩が、Na2CO3およびK2CO3からなる群から選択され、前記硫酸塩が、Na2SO4およびK2SO4からなる群から選択される請求項10から請求項13のいずれかに記載の銀ナノワイヤの製造方法。
- 前記脂肪族アルコールがエチレングリコールおよびプロピレングリコールからなる群から選択される1以上であり、かつ前記ハロゲン化物、硫化物、炭酸塩および硫酸塩から選択される少なくとも一種の濃度が1×10-8~1×10-2Mである請求項10から請求項14のいずれかに記載の銀ナノワイヤの製造方法。
- 前記加熱工程中に溶液の紫外・可視吸収スペクトルを測定し、350nmでの吸収強度(A350)に対する420nmでの吸収強度(A420)の比率(A420nm/A350nm)が2を超えず、かつ、380nmでの吸収強度(A380)がピーク時の半分以下にならない時点で反応を停止することを特徴とする請求項15に記載の銀ナノワイヤの製造方法。
- 請求項10から請求項16のいずれかに記載の銀ナノワイヤの製造方法により製造した銀ナノワイヤ。
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