METHOD FOR MANUFACTURING METAL NANOPARTICLES BY USING PHASE TRANSITION REDUCTION, AND METAL INK COMPRISING METAL NANOPARTICLES MANUFACTURED THEREBY

摘要

A method of preparing metal nanoparticles using a phase transfer reduction method in which a reduction reaction is adjusted by distribution equilibrium between an intermediate formed by a coordinate bond between a capping material and various metal precursors in the form of an organic phase and a reducing agent present in an aqueous phase, and a metal ink prepared from the metal nanoparticles. The method of preparing metal nanoparticles includes dissolving a metal precursor and a capping agent in an organic phase, dissolving a reducing agent in an aqueous phase, mixing the organic phase and the aqueous phase to form a precipitate, separating the precipitate, and drying the separated precipitate. The metal nanoparticles prepared using the method can be prepared to have various particle sizes according to the kind of precursors and a length of an alkyl chain of an amine used as the capping agent. As a self-quenching reaction in which growth of the nanoparticles in the aqueous layer is stopped takes place since the nanoparticle precipitate into the aqueous layer from the organic layer due to a difference in density of the metal nanoparticles formed during a reaction, a particle size of the metal nanoparticles can be easily controlled, and excellent processability in which the metal nanoparticles are easily separated/purified from the organic layer in which most reaction by-products are present can be ensured. Also, as the metal nanoparticles having various particle sizes are able to be prepared, a metal ink having various sintering temperatures spanning from a low temperature to a high temperature can be prepared using the metal nanoparticles.

主权项

1. A method of preparing metal nanoparticles, comprising:
dissolving a metal precursor and a capping agent in an organic phase; dissolving a reducing agent in an aqueous phase; mixing the organic phase and the aqueous phase to form a precipitate; separating the precipitate; and drying the separated precipitate.