Patent ID: 7910164
Filing Date: 2011-03-22
Classification: B22F,B82Y,C22C,H01F,Y10T

Abstract:
1. A method for manufacturing bifunctional magnetic core-semiconductor shell nanoparticles by a sequential process, the method comprising: mixing magnetic core material precursors and a reducing agent for the core material precursors; mixing the resultant with a solvent for the magnetic core material precursors and the reducing agent and preparing a first mixture solution; heating the first mixture solution to a first temperature and maintaining the first mixture solution for a first period; cooling the first mixture solution to a room temperature and preparing magnetic core materials; mixing the magnetic core materials with semiconductor shell material precursors and a reducing agent for the semiconductor shell material precursors; in the same location where magnetic core materials are prepared, mixing the resultant with a solvent for the semiconductor shell material precursors and the reducing agent and preparing a second mixture solution, wherein the solvent for the semiconductor shell material precursors is the same as the solvent for the magnetic core material precursors; heating the second mixture solution to a second temperature and maintaining the second mixture solution for a second period; and cooling the second mixture solution to a room temperature and coating the magnetic core materials with the semiconductor shell materials, wherein the preparing of the first mixture solution further comprises adding a polymer surfactant, wherein the preparing of the second mixture solution further comprises adding a polymer surfactant, and wherein the core is magnetite (Fe