Copper powder and its manufacturing method

Abstract

The copper powder of the present invention comprises an aggregate of copper particles containing phosphorus (P). In the X-ray photoelectron spectroscopy obtained by measuring the surface of the copper particles using an X-ray photoelectron spectroscopy apparatus, the ratio of the peak intensity P1 of Cu(I) to the peak intensity PP of P, i.e., P1 / PP, is 15.5 to 250.0 or less. Preferably, phosphorus is distributed throughout the center to the surface of the copper particles. The copper particles are suitably manufactured by a method comprising the following steps: mixing a raw material powder containing an aggregate of copper particles containing phosphorus (P) with an aqueous solution containing a complexing agent containing Cu(II) ions.

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