Patent ID: 7906084
Filing Date: 2011-03-15
Classification: C30B,Y10S

Abstract:
1. A method for producing lead (Pb)-chalcogenide nanoparticles, the method being operable to control the shape and size of the Pb-chalcogenide nanoparticles, and comprising of the steps: preparing a Pb precursor containing a Pb compound and a carboxylic acid dissolved in a hydrocarbon solution of the form (R) preparing a chalcogen element precursor containing a chalcogen element dissolved in a hydrocarbon solution of the form (R) mixing the Pb precursor with the chalcogen element precursor to make a Pb-chalcogen mixture having the Pb:chalcogen element ratio; preparing a nucleation and growth solution containing a surfactant; heating the nucleation and growth solution to a nucleation temperature sufficient to nucleate Pb-chalcogenide nanoparticles when the Pb-chalcogen mixture is added; injecting the Pb-chalcogen element mixture into the nucleation and growth solution whereby said nucleation and growth solution causes Pb-chalcogenide nanoparticles to nucleate; cooling the Pb-chalcogenide nanoparticle solution to a growth temperature that is below the nucleation temperature; holding the Pb-chalcogenide nanoparticle solution at the growth temperature for a predetermined time period such that a desired nanoparticle size is obtained; and cooling the Pb-chalcogenide nanoparticle solution to a temperature below the growth temperature such that continued growth of the Pb-chalcogenide nanoparticles is terminated.