Nano-metal solution, nano-metal complex grains and manufacturing method of metal film

A nano-metal complex grain, comprising:

• a plurality of metal grains;
• a metal layer, covering surfaces of the metal grains;
• and
• an alloy layer, located between the metal grains and the metal layer, wherein the alloy layer is an alloy of the metal grains and the metal layer, and the metal grains are bonded together.

A manufacturing method of a metal film, the manufacturing method comprising:

• fabricating a nano-metal solution, the nano-metal solution comprising:
• a plurality of metal grains having an amount of 0.1˜30 wt %;
• a plurality of metallic-organic self-decomposition molecules having an amount of 0.1˜50 wt % and having formula 1:
• wherein M represents a metal ion;
• and
• a solvent having an amount of 20˜99.8 wt %,
• wherein the metallic-organic self-decomposition molecules and the metal grains are evenly mixed in the solvent, and the metallic-organic self-decomposition molecules are adsorbed on surfaces of the metal grains;
• forming the nano-metal solution on a substrate;
• and
• performing a sintering process to self-decompose the metallic-organic self-decomposition molecules so as to form a metal layer on the surfaces of the metal grains by the metal ions of the metallic-organic self-decomposition molecules and form an alloy layer between the metal grains and the metal layer, wherein the alloy layer is an alloy of the metal grains and the metal layer.