Method for producing silver nanoparticles

A method controlling the molar ratio of chelating agent to silver ions and using specific reducing agents with microwave irradiation produces silver nanoparticles with small and uniform sizes, addressing production challenges and reducing costs for mass production.

JP7743822B2Active Publication Date: 2025-09-25TOYOTA JIDOSHA KK
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Patent Information

Application Number
JP2022137826
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-08-31
Publication Date
2025-09-25
Estimated Expiration
2042-08-31

AI Technical Summary

Technical Problem

Conventional methods for producing silver nanoparticles face challenges in achieving small and uniform particle sizes due to complex synthesis conditions, fast reaction rates, and limitations in silver ion concentration, leading to increased production costs and particle coarsening.

Method used

A method involving a controlled molar ratio of chelating agent to silver ions, using reducing agents with specific functional groups, and excluding polymer protective agents, combined with microwave irradiation, to produce silver nanoparticles with a molar ratio of 0.12 to 5.0, resulting in small and uniform particle sizes.

Benefits of technology

Enables the production of silver nanoparticles with narrow particle size distribution and high yield, reducing production costs through mass production, suitable for use as high-heat-resistant bonding materials in electronics packaging.

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Abstract

To provide a production method of silver nanoparticles, capable of easily producing silver nanoparticles having a small and uniform particle diameter even from silver ions that are present at a high concentration in a solution to reduce production cost through high-volume production.SOLUTION: The production method of silver nanoparticles includes reducing silver ions in a reaction liquid. The reaction liquid contains silver ions (i), a reductant (ii), a chelate agent (iii) and a solvent (iv), with a molar ratio between the chelate agent and the silver ions (Chelate agent / Silver ions) of 0.12 to 5.0.SELECTED DRAWING: Figure 1
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Citation Information

Patent Citations

  • Methods for preparing silver nano-particles and conductive nano-film of silver nano-particles

    CN102463351A

  • Method for producing particulate silver particle, and particulate silver particle obtained by the method

    JP2007239077A

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    JP2008156720A

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    JP2016135916A

  • Method for manufacturing metal nanoparticle

    JP2019178355A