Patent ID: 8236089

Claim:
A preparation method of a copper particle composition, comprising: [Step 1] dissolving a copper carboxyl compound expressed by the following chemical figure 1, or a carboxyl group-containing compound expressed by the following chemical figure 2 and a copper salt, in a solvent to prepare a copper(II) precursor solution; (R 1 —COO) 2 Cu Chemical Figure 1 where R 1 is an alkyl group of C 1 to C 18 , R 1 —COOH Chemical Figure 2 where R 1 is an alkyl group of C 1 to C 18 , [Step 2] putting a weak reducing agent with a standard reduction potential of −0.2 to −0.05V to the prepared copper(II) precursor solution to assemble a plurality of Cu 2 O fine particles having an average diameter of 1 to 100 nm with a standard deviation of 0 to 10%, thereby forming spherical Cu 2 O assembly particles having an average diameter of 0.1 to 10 μm with a standard deviation of 0 to 40%; [Step 3] reducing the spherical Cu 2 O assembly particles into copper particles by using a reducing agent; and [Step 4] separating the copper particles from the result product.