Provider: Ingenta Connect
Database: Ingenta Connect
Content: application/x-research-info-systems
TY - ABST
AU - Salgueiriño-Maceira, Verónica
AU - Correa-Duarte, Miguel A.
AU - López-Quintela, M. Arturo
AU - Rivas, José
TI - Advanced Hybrid Nanoparticles
JO - Journal of Nanoscience and Nanotechnology
PY - 2009-06-01T00:00:00///
VL - 9
IS - 6
SP - 3684
EP - 3688
KW - SUPERPARAMAGNETISM
KW - CORE-SHELL STRUCTURE
KW - FLUORESCENCE
KW - SURFACE PLASMON BAND
N2 - Methods for the development of bifunctional magnetic and optically tunable nanoparticles with a structural design involving a magnetic iron oxide core (Fe3O4/γ-Fe2O3) surrounded by a thick silica shell and further covered with
an outer shell of optically active nanoparticles (CdTe quantum dots or gold nanoparticles) are reported. These highly fluorescent, optically tunable, and magnetic core–shell nanoparticles were synthesized from a modified Stöber method combined with the Layer-by-layer (LbL) assembly
technique. Both types of particles were prepared through two main steps, including a controlled addition of tetraethoxysilane (TEOS) to a dispersion of Fe3O4/γ-Fe2O3 nanoparticles, which were thereby homogeneously incorporated as cores
into monodisperse silica spheres. The second step involved the LbL assembly of polyelectrolytes and luminescent CdTe quantum dots or Au nanoparticles onto the surface of the silica-coated magnetite/maghemite particles, which (for CdTe) were finally covered with an outer, protective silica
shell. These spherical particles have a typical diameter of 220 and 230±10 nm, a saturation magnetization (MS) of 1.34 emu/g at room temperature and a strong excitonic photoluminescence or an intense surface plasmon band.
UR - https://www.ingentaconnect.com/content/asp/jnn/2009/00000009/00000006/art00051
M3 - doi:10.1166/jnn.2009.NS51
UR - https://doi.org/10.1166/jnn.2009.NS51
ER -