METHOD FOR DISPERSING NANOPARTICLES AND METHOD FOR PRODUCING NANOPARTICLES THIN FILM USING THE SAME

摘要

A method of preparing nano-particle dispersion is provided to eliminate unstability, defects or aggregation of nano-particles and to use the dispersion to fabricated second- or three-dimensional thin film for flash memory, DRAM hard disk, LED, OLED, etc. by reforming surface of nano-particle, dispersing the reformed nano-particle in solvent and centrifuging the dispersion. The method includes the steps of: (a) reforming surface of nano-particles to have charge thereon; (b) vacuum drying the reformed nano-particles; and (c) centrifuging the nano-particles after dispersing the dried nano-particles in solvent. The surface reformation step is performed by adding the nano-particles to a charged solution and refluxing the mixture while agitating to react at desired temperature of 50 to 150deg.C for 1 to 10 hours. The vacuum drying step is carried out for 1 to 12 hours. The centrifugation step is executed at 4,000 to 50,000g for 1 minute to 3 hours. The nano-particles are selected from a group consisting of II-VI families, IV-VI families or IV family compound semiconductor, metal and magnetic particles.