Copper-containing nanoparticles and manufacturing method therefor
Copper-containing nanoparticles with excellent oxidation resistance is provided. The present invention relates to a method for manufacturing copper-containing nanoparticles including obtaining copper-containing nanoparticles that contain an organic component by heat treating an organic copper compound at a temperature equal to or higher than a decomposition initiation temperature of the compound and lower than a complete decomposition temperature of the compound in a non-oxidative atmosphere in the presence of an organic material containing a 1,2-alkanediol having 5 or more carbon atoms and/or a derivative thereof.
1. A method for manufacturing copper-containing nanoparticles, comprising a step of obtaining nanoparticles containing an organic component, copper and cuprous oxide by heat treating an organic copper compound at a temperature equal to or higher than a decomposition initiation temperature of the compound and lower than a complete decomposition temperature of the compound in a non-oxidative atmosphere in the presence of an organic material containing (1) a tertiary amine compound and (2) a 1,2-alkanediol and/or a derivative thereof, wherein the number of carbon atoms in the 1,2-alkanediol or a derivative thereof is 8 to 30.
2. The manufacturing method according to claim 1 , wherein the organic copper compound is a copper salt of an organic acid having 5 or more carbon atoms.
3. The manufacturing method according to claim 1 , wherein heat treatment is performed under conditions with no primary amine or secondary amine present.
4. Copper-containing, nanoparticles comprising an organic component, Cu and Cu 2 O in each particle, wherein an intensity ratio of Cu 2 O in an X-ray diffraction pattern is 50% or less given 100% as the total of intensities of Cu and Cu 2 O, and wherein the organic component contains at least one of a 1,2-alkanediol with 5 or more carbon atoms, a derivative thereof and a component derived from these.
5. The copper-containing nanoparticles according to claim 4 , wherein the content of the organic component is 25 wt % or less.
6. The copper-containing nanoparticles according to claim 4 , wherein the change in the intensities of the Cu and Cu 2 O in the X-ray diffraction pattern immediately after oxidation resistance testing in which the copper-containing nanoparticles immediately after synthesis is left for 1 month at a temperature of 25° C. and a humidity of 60% in air is no more than 3% of intensities of the Cu and Cu 2 O in the X-ray diffraction pattern of the copper-containing nanoparticles immediately after synthesis.
7. The copper-containing nanoparticles according to claim 4 , which is obtained by the manufacturing method according to claim 1 .
8. A paste comprising the copper-containing nanoparticles according to claim 4 and at least one of a solvent and a viscosity modifying resin.