Synthesis of magnetite and magnetite-silica/colloidal gold core-shell Nanoshells |
Paper ID : 1467-UFGNSM-FULL |
Authors: |
Abstract: |
In the recent decade, scientists have focused on spherical core-shell nanostructures because of their unique optical, physical, chemical and magnetic properties. Compared to quantum dots, metal nanoshells attracted more attention which is due to the absence of toxic cadmium in their structures. In this research, synthesis of two types of nanoshells with two different types of cores was studied. Magnetite and magnetite-silica nanoparticles were used as cores of these nanoshells. First, APTES ligand was attached to the surface of magnetite nanoparticles synthesized by co-precipitation method and coated by silica. In this way, surface possessed positive charge. Then, colloidal gold was synthesized by adding tri-sodium citrate and HAuCl4 to boiling water by vigorous stirring. Due to its negative charge, the colloids were absorbed to positively charged core-ligand electrostatically. To study the properties of synthesized nanostructures, XRD, TEM and magnetometer tests were conducted. Based on the results, silica coated cores had better magnetic properties because silica shell prevented oxidizing of magnetite to maghemite. Therefore, it was easier to control, conduct, and detect magnetite-silica-gold nanoshells. Hence, for medical purposes which are the main application of Nanoshells, especially for cancer therapy, magnetite- silica- gold nanoshells are more suitable. |
Keywords: |
Silica, Magnetite, Colloidal gold, Core- shell nanostructures, Nanoshells |
Status : Paper Accepted (Poster Presentation) |