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US 10,894,302 B2Granted
Multilayered metal nano and micron particles
AssigneeAlpha Assembly Solutions Inc.
InventorsShamik Ghoshal, Remya Chandran, Sutapa Mukherjee, Siuli Sarkar, Ranjit Pandher, Bawa Singh
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Abstract
A sintering powder, wherein a least a portion of the particles making up the sintering powder comprise: a core comprising a first material; and a shell at least partially coating the core, the shell comprising a second material having a lower oxidation potential than the first material.
Claims15
A sintering powder, wherein particles of the sintering powder comprise:
- a core comprising a first material comprising copper;
- and
- a shell at least partially coating the core, the shell comprising a layer of a second material having a lower oxidation potential than the first material, the second material comprising silver;
- and
- a capping agent at least partially coating the shell, the capping agent comprising octylamine;
- wherein the particles have a D50 of from 1 to 30 nm.
3 more elements
A method of manufacturing a sintering powder comprising copper-containing nanoparticles coated with a layer comprising silver, the method comprising:
- (i) providing a solution comprising a hydrazine reducing agent, a capping agent, and copper-containing nanoparticles;
- (ii) contacting the solution from step (i) with hydroxide ions and acetone to reduce the concentration of the hydrazine reducing agent in the solution;
- (iii) contacting the solution from step (ii) with a silver salt to at least partially coat at least some of the copper-containing nanoparticles with a layer comprising silver;
- and
- (iv) recovering at least some of the copper-containing nanoparticles coated with the layer comprising silver from the solution of step (iii);
- wherein the particles comprise:
- a core comprising the first material comprising copper;
- and
- a shell at least partially coating the core, the shell comprising a layer of the second material comprising silver;
- and
- a capping agent at least partially coating the shell, the capping agent comprising octylamine;
- wherein the particles have a D50 of from 1 to 30 nm.
9 more elements
Dependencies are inferred from the claim text.