The preparation of core-shell magnetic silica nanospheres for enhancing magnetism and fluorescence intensity.
J Nanosci Nanotechnol
; 13(11): 7615-9, 2013 Nov.
Article
en En
| MEDLINE
| ID: mdl-24245302
ABSTRACT
Recently, magnetic and luminescent composite silica with structure of micro- and nanospheres containing both magnetic (Fe3O4) nanoparticles (MPs) and quantum dots (QDs) has attracted great interests. In this study, we have prepared core-shell structure of silica spheres in which magnets are incorporated into silica core and QDs into a mesoporous silica shell by using C18-TMS (octade-cyltrimethoxysilane). MPs were synthesized by a co-precipitation method from ferrous and ferric solutions with a molecular ratio of 23. Monodisperse magnetic silica cores have been prepared via sol-gel reaction of TEOS (tetraethoxysilane) and water using base catalyst. The size of magnetic silica nanospheres was confirmed by dynamic laser light scattering system (DLS) and scanning electoron microscope (SEM). The pore volume and surface area were calculated by using BET after calcination. The core-shell structure plays an important role in providing more domains for MPs in silica Core and QDs in silica shell. QDs were incorporated into the mesoporous shell by hydrophobic interactions. Magnetic characterization was performed using a superconducting quantum interference device (SQUID). The optical properties of the particles were characterized with UV/Vis spectrometer, PL spectrometer, and fluorescence microscope.
Buscar en Google
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Dióxido de Silicio
/
Cristalización
/
Puntos Cuánticos
/
Nanosferas
/
Nanopartículas de Magnetita
Idioma:
En
Revista:
J Nanosci Nanotechnol
Año:
2013
Tipo del documento:
Article