Copper nano-ink, printed circuit board substrate, and method of manufacturing printed circuit board substrate

Abstract

This copper nano-ink includes copper nanoparticles and a solvent. The copper nanoparticles have a first mean particle size of 1 nm to 200 nm, the first mean particle size is a volume-based mean diameter obtained by analyzing a scanning electron microscope image of the copper nanoparticles, the copper nanoparticles contain at least one of copper oxide and copper hydroxide, and in the copper nano-ink, a first ratio is 5.0% or less, the first ratio being a ratio of a mass ratio M2 of a total of copper oxide and copper hydroxide to a mass ratio M1 of copper, the mass ratio M2 and the mass ratio M1 being measured by a reference intensity ratio method.

Dependencies are inferred from the claim text.