NICKEL FINE PARTICLE, METHOD FOR PRODUCING THE SAME, AND FLUID COMPOSITION USING THE SAME

摘要

Disclosed is a method for producing nickel metal fine particles by reacting a nickel compound with a reducing agent in a liquid medium. In this method, a liquid medium is added with at least a protective colloid, a reducing agent and a nickel compound which is poorly soluble in the liquid medium, and the resulting liquid is aged, and then a reducing agent and at least one substance selected from noble metals and their compounds are added into the aged liquid, thereby producing nickel metal fine particles. As the noble metals and their compounds, at least one substance selected from palladium, gold, platinum and their compounds is preferable. The thus-produced nickel metal fine particles have an average particle diameter (D) as measured by an electron microscope of 0.001-0.5 µm and an average particle diameter (d) as calculated from the specific surface area of 0.001-0.5 µm. The value of d/D is within the range of 0.85-1.30. The nickel metal fine particles are very fine while having a regular shape, and hardly contain agglomerated particles. Consequently, the nickel metal fine particles are useful as an electrode material for electronic devices and the like.