Dispersion solution of metal nanoparticle, method for production thereof, and method for synthesis of metal nanoparticle

A technology of metal nanoparticles and synthesis methods, which can be used in cable/conductor manufacturing, electrical components, circuits, etc., and can solve problems such as raw material limitations

Active Publication Date: 2010-01-06
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to prepare the target metal nanoparticles in the form of a uniform dispersion, it is necessary to use a material in which the metal salt (metal compound) of the raw material is also dissolved in the liquid (solvent), so the raw material has been limited in the past

Method used

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  • Dispersion solution of metal nanoparticle, method for production thereof, and method for synthesis of metal nanoparticle
  • Dispersion solution of metal nanoparticle, method for production thereof, and method for synthesis of metal nanoparticle
  • Dispersion solution of metal nanoparticle, method for production thereof, and method for synthesis of metal nanoparticle

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Comparison scheme
Effect test

Embodiment 1～20、 comparative example 1～3

[0398] First, metal salts containing metal elements shown in Table 1 and Table 2 below, carboxylic acids, reducing agents and additives were respectively dissolved in deionized water to prepare saturated aqueous solutions at room temperature. Note that nitrates were used as metal salts, and only chlorine compounds were used for Au and Pt.

[0399] Next, the obtained carboxylic acid aqueous solution B and one of the metal salt aqueous solution A or the reducing agent aqueous solution C are mixed to form a mixed solution, and then any of the metal salt solution A or the reducing agent aqueous solution C is added to the mixed solution. A solution that has not been added, mixed further. There are two cases for this mixing order: if figure 1 As shown, first mix carboxylic acid aqueous solution B and metal salt aqueous solution A, then add reducing agent aqueous solution C in the mixed solution; also as figure 2 As shown, the carboxylic acid aqueous solution B and the reducing a...

Embodiment 21

[0425] First, silver nitrate was dissolved in deionized water to prepare a metal salt solution. Then chromium nitrate was dissolved in deionized water to prepare an additive aqueous solution. On the other hand, trisodium citrate is dissolved in deionized water, and in a nitrogen flow at a temperature of 35° C., granular ferrous sulfate is directly added to the trisodium citrate aqueous solution having a concentration of 26% to dissolve it, A carboxylic acid-reducing agent mixed solution containing citrate ions and ferrous ions at a molar ratio of 3:2 was prepared. Next, in the state where the above-mentioned nitrogen flow is maintained at a temperature of 35° C., the stirrer of the magnetic stirrer is rotated at a speed of 100 rpm, and the carboxylic acid-reductant mixed solution is stirred into the carboxylic acid-reductant mixed solution. The above-mentioned metal salt aqueous solution and additive aqueous solution were added dropwise and mixed. Wherein, the concentration ...

Embodiment 22

[0427] The chromium nitrate in Example 21 was replaced with tin nitrate, and the dispersion liquid obtained in the same manner as in Example 21 was left at room temperature, and aggregates of precipitated metal nanoparticles were separated by decantation. Deionized water was added to this isolate to prepare a dispersion liquid, which was subjected to desalination treatment by ultrafiltration, and then further continued to replace and wash with ethanol so that the metal content was 50% by mass. This dispersion liquid was used as the first dispersion liquid.

[0428] On the other hand, the silver nitrate in Example 21 was replaced by palladium nitrate, the chromium nitrate in Example 21 was replaced by tin nitrate, the dispersion obtained in the same manner as in Example 21 was left at room temperature, and the precipitated metal was separated by decantation. aggregates of nanoparticles. Deionized water was added to this isolate to prepare a dispersion liquid, which was subject...

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Abstract

An object is to provide: a method for producing a dispersion solution of a metal nanoparticle, which enables to control the shape or particle size of the metal nanoparticle within a wide range; a dispersion solution of a metal nanoparticle, which has excellent dispersion stability; and a method for producing the dispersion solution. Another object is to provide: a dispersion solution of a metal nanoparticle, which has a volume resistivity of 2 to 6 x 10<-6> Omega cm which is a value useful for use as an electrically conductive material; and a method for producing the dispersion solution. Still another object is to provide a method for the synthesis of a metal nanoparticle, which can synthesize a metal nanoparticle from an insoluble metal salt without using no corrosive material and can produce a metal nanoparticle suitable as an electrically conductive material.

Description

technical field [0001] The invention relates to a metal nanoparticle dispersion liquid and a preparation method thereof. The invention further relates to methods for the synthesis of metal nanoparticles. Background technique [0002] Conventionally, metal nanoparticles with a particle size of about several nanometers have a melting point significantly different from that of bulky (bluk) metals, so they are expected to be used as conductive pastes that can be used by low-temperature sintering. In order to prepare the metal nanoparticles described above, conventionally, a method of reducing a metal in a solvent is known. [0003] For example, as a method of synthesizing silver nanoparticles in an aqueous solution, many methods represented by the so-called Carey-Lea sol method in which an aqueous solution of silver nitrate is added to an aqueous solution of ferrous salt-citrate have been studied. Thereby, a silver colloid dispersion having a particle diameter of 10 nm order h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24C22C5/06H01B13/00
Inventor 山崎和彦片桐文衣理荒井将英高田佳明林年治
Owner MITSUBISHI MATERIALS CORP
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