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US 10,201,852 B2Granted
Silver particle synthesizing method, silver particles, conductive paste producing method, and conductive paste
AssigneeOsaka University
InventorsKatsuaki Suganuma, Jinting Jiu
Life of this patent
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Abstract
A silver particle synthesizing method includes reducing a dispersant from first silver particles each covered with the dispersant to obtain second silver particles. The method further includes synthesizing third silver particles each having a larger particle diameter than the second silver particles by causing a reaction between a silver compound and a reductant in a liquid phase containing the second silver particles.
Claims10
A silver particle synthesizing method comprising:
- synthesizing first silver particles each covered with a dispersant by causing a reaction between a first silver compound and a first reductant in a liquid phase containing the dispersant;
- reducing the dispersant from the first silver particles to obtain second silver particles having an average particle diameter of at least 100 nanometers and no greater than 500 nanometers;
- and
- synthesizing third silver particles each in a polyhedral shape while synthesizing fourth silver particles by causing a reaction between a second silver compound and a second reductant in a liquid phase containing the second silver particles, the third silver particles having a first particle diameter distribution, the fourth silver particles having a second particle diameter distribution different from the first particle diameter distribution, wherein
- the first particle diameter distribution has an average particle diameter range of at least 1 micrometer and no greater than 15 micrometers, and
- the second particle diameter distribution has an average particle diameter range of at least 100 nanometers and less than 1 micrometer.
3 more elements
Silver particles comprising:
- silver particles each in a polyhedral shape having a first particle diameter distribution;
- and
- silver particles having a second particle diameter distribution different from the first particle diameter distribution, wherein
- the first particle diameter distribution has an average particle diameter range of at least 1 micrometer and no greater than 15 micrometers,
- the second particle diameter distribution has an average particle diameter range of at least 100 nanometers and less than 1 micrometer, and
- the silver particles in the polyhedral shape each have a crystal surface.
3 more elements
A conductive paste producing method comprising:
- synthesizing first silver particles each covered with a dispersant by causing a reaction between a first silver compound and a first reductant in a liquid phase containing the dispersant;
- reducing the dispersant from the first silver particles to obtain second silver particles having an average particle diameter of at least 100 nanometers and no greater than 500 nanometers;
- synthesizing third silver particles each in a polyhedral shape while synthesizing fourth silver particles by causing a reaction between a second silver compound and a second reductant in a liquid phase containing the second silver particles, the third silver particles having a first particle diameter distribution, the fourth silver particles having a second particle diameter distribution different from the first particle diameter distribution;
- and
- producing a conductive paste by mixing the third and fourth silver particles with an alcohol, wherein
- the first particle diameter distribution has an average particle diameter range of at least 1 micrometer and no greater than 15 micrometers, and
- the second particle diameter distribution has an average particle diameter range of at least 100 nanometers and less than 1 micrometer.
4 more elements
A conductive paste comprising:
- silver particles each in a polyhedral shape having a first particle diameter distribution;
- silver particles having a second particle diameter distribution different from the first particle diameter distribution;
- and
- an alcohol, wherein
- the first particle diameter distribution has an average particle diameter range of at least 1 micrometer and no greater than 15 micrometers,
- the second particle diameter distribution has an average particle diameter range of at least 100 nanometers and less than 1 micrometer, and
- the silver particles in the polyhedral shape each have a crystal surface.
4 more elements
Dependencies are inferred from the claim text.