MAGNETIC FLUORESCENT NANOCOMPOSITE AND THE SYNTHESIS OF THE NANOCOMPOSITE

摘要

PURPOSE: A nanocomposite with simultaneous magnetic and fluorescent properties and a manufacturing method thereof is provided to display high luminous efficiency even in an aqueous solution and have high magnetic properties. CONSTITUTION: A nanocomposite comprises an S-H combined cadmium selenide/zinc sulfide core-shell quantum dot and an iron oxide colloidal nanocluster. A ratio of cadmium to selenium to zinc sulfide in the cadmium selenide/zinc sulfide core-shell quantum dot is 0.1:0.2:4:3. A coupling ratio of the cadmium selenide/zinc sulfide core-shell quantum dot to the iron oxide colloidal nanocluster is between 1:20 and 1:40, by weight. A manufacturing method of the nanocomposite comprises the following steps: coupling the iron oxide(Fe3O4) colloidal nanocluster coated with poly(acrylic acid)(PAA) with N-3-dimethylaminopropyl-N'-ethylcarbodiimide hydrochloride(EDC)/N-hydroxysulfosuccinimide sodium salt(Sulfo-NHS); replacing the surface with thiol groups by adding cysteamine; dispersing the iron oxide colloidal nanocluster of which the surface is substituted with thiol groups in a solution; adding the cadmium selenide/zinc sulfide (CdSe/ZnS) nanoparticle solution; and forming the nanocluster by using a magnet while stirring and washing the solution.