Synthesis and characteristics of multifunctional Fe ₃ O ₄ -SiO ₂ -CdS magnetic-fluorescent nanocomposites

Abstract

A luminescent superparamagnetic nanocomposite with an Fe 3 O 4 -SiO 2 -CdS structure is synthesized. Coated with a silica shell, Fe 3 O 4 nanoparticles and CdS quantum dots (QDs) are successfully assembled together. Analysed from the test results of X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), hysteresis loop, and photoluminescence (PL) spectrum, these nanocomposites exhibit superparamagnetic and photoluminescent properties.

Cation distributions estimated using the magnetic moments of the spinel ferrites Co1−xCrxFe2O4at 10 K

“…Co ferrites with striking magnetic, electrical, and optical properties have potential applications in various fields, such as recording tapes, permanent magnets, hard disc recording media, read-write heads, magnetic drug delivery, catalysis, color imaging, magnetic refrigeration, magnetic resonance imaging (MRI) contrast enhancement, magnetic cell separation, etc. [1][2][3][4][5] CoFe 2 O 4 is a typical spinel ferrite with an (A)[B] 2 O 4 structure. Each spinel unit cell contains eight formula units.…”

Electric field distribution around the chain of composite nanoparticles in ferrofluids

“…Up to now, a lot of researches, either theoretical or experimental, have been carried out to synthesize and characterize the ferromagnetic core/shell structures, typically including iron oxide metallic shell, [6] Fe 3 O 4 @Au, [7] Fe 3 O 4 @Ag, [8] etc. [9][10][11][12][13] To fabricate core/shell magnetic nanocomposites, magnetic NPs can be obtained with wet chemical processes in aqueous systems and the metallic shell can be reduced at the NP surface to add a metal layer, which can then be functionalized with thiolated molecules via a covalent bond to the surface of the NPs. [14,15] The ferromagnetic nanocomposites will form an ordered chain with the applied magnetic field.…”

A novel method to prepare Au nanocage@SiO 2 nanoparticle

“…[8] This core-shell structure can be functionalized with amino, carboxyl, and alkyl groups to facilitate the rapid translation of the nanoparticles to the target location. [7,8,[13][14][15][16] Some functional nanoparticles, such as QDs, can be connected via these groups, which combine the photothermal properties of the Au nanocage with the optical properties of QDs, showing the potential application in biological mark treatment. A new trend in current nanobiotechnology and theranostics is the fabrication of multifunctional nanoparticles, which combine the therapeutic and diagnostic modalities in a single nanostructure.…”