| abstract |
[Problem] To provide flat copper particles having a high packing density and easy viscosity control when made into a paste. The flat copper particles of the present invention have a contour defined by a plurality of substantially linear sides in a plan view, and all the angles formed by adjacent sides are 60 degrees or more and less than 180. The average particle diameter Dia is considerably 0.05 to 0.5 μm. This flat copper particle is suitably manufactured by a method including a first reduction step and a second reduction step performed thereafter. In the first reduction step, reducing sugar or hydrazine is used as the reducing agent, and in the second reduction step, two reducing agents having a hydrogen reduction standard potential E 0 of −1.11 to −1.24 V are used as the reducing agent. Use above. [Selection] Figure 1 |