Conductive Pastes Using Bimodal Particle Size Distribution

摘要

Monodispersed metal nanoparticles are prepared by preparing a homogeneous metal complex solution by mixing metal salt with a complexing agent in solvent. A precipitating agent is added into the homogeneous metal complex solution to form a slurry. A homogeneous mixture of reducing agent and solvent is added to perform reducing reaction on the slurry to form metal nanoparticles in a controlled environment under gas purge. A capping agent is added to modify surface properties of metal nanoparticles. The metal nanoparticles are washed and the metal nanoparticles are recovered by phase extraction or centrifugation. The technique can be used to prepare conductive pastes with bimodal particle size distribution.

主权项

1. A method to prepare monodispersed metal nanoparticles, the method comprising:
preparing a homogeneous metal complex solution by mixing metal salt with a complexing agent with a mole ratio (metal salt : complexing agent) ranging from 1:0.5 to 1:20, in solvent; adding precipitating agent into the homogeneous metal complex solution to form a slurry; adding a homogeneous mixture of reducing agent and solvent to perform reducing reaction on the slurry to form metal nanoparticles in a controlled environment under gas purge; adding capping agent to modify surface properties of metal nanoparticles; and washing the metal nanoparticles by washing solvent repeatedly and recovering the metal nanoparticles by phase extraction or centrifugation.