A Facile Approach to Fabrication of Bifunctional Magnetic-Optical Fe₃O₄@ZnS Microspheres

Abstract

Bifunctional magnetic-optical Fe 3 O 4 @ZnS microspheres with core-shell heterostructures have been successfully fabricated by a simple chemical deposition method. The adsorption of sodium dodecyl sulfate (SDS) on the preformed magnetite microspheres played an essential role in directing the structure of the composites. The presented materials were characterized by FE-SEM, HRTEM, XRD, FTIR, fluorescence spectrophotometer, and SQUID MPMS. The results showed that spherical Fe 3 O 4 cores were coated by a uniform ZnS layer. The saturation magnetization value of Fe 3 O 4 @ZnS core-shell microspheres is 52.5 emu g -1 at room temperature. Ultraviolet and visible light can be easily obtained by exposing the microspheres to different excitation wavelengths. The combined magnetic and fluorescent properties endow the microspheres with great potential applications in drug targeting, bioseparation and diagnostic analysis.

Functionalized magnetic iron oxide/alginate core-shell nanoparticles for targeting hyperthermia

“…Here we chose the experiment parameters of 10 mg of alginate and pH 10 for obtaining the optimal particle size for intravenous injection. The role of alginate is to homogeneously distribute the Figure 3A, the X-ray diffraction patterns for Fe 3 O 4 , indicating that the synthetic method used in this study (ie, the combined coprecipitation and pre-gel methods) did not alter the crystalline phase of iron oxide. Further evidence of the formation of Fe 3 O 4 @Alg nanoparticles was provided by FTIR.…”

“…Superparamagnetic iron oxide nanoparticles (SPIONs), including magnetite (Fe 3 O 4 ) and maghemite (γ-Fe 2 O 3 ), have been extensively utilized in biomedical applications, including as magnetic resonance imaging contrast agents, 1 for biocatalysis, 2 for biological separation, 3 for biosensing, 4 diagnostic medical devices, 5 and hyperthermia. Among these applications, hyperthermia 6 is a physical therapy in which SPIONs generate heat and thus kill cancer cells when they are exposed to an external magnetic field.…”

“…In this study, we developed a new synthetic approach to prepare carboxylic acid-functionalized SPIONs (ie, Fe 3 6 ]⋅3H 2 O), 10% neutral buffered formalin, nuclear fast red counterstain, and sodium alginate were purchased from Sigma-Aldrich (St Louis, MO, USA). D-(+)-galactosamine hydrochloride was provided by Acros Organics (Thermo Fisher Scientific, Bridgewater, NJ, USA).…”

Self-organization of an optomagnetic CoFe2O4–ZnS nanocomposite: preparation and characterization

“…However, because of the lattice nonconformity of the components, it is difficult for QDs to directly coat magnetic particles. To address these challenges, some intermediate layers such as amorphous silica can be used as spacers in the synthesis of nanocomposites [17][18][19].…”

Fabrication and optical properties of ZnS:Mn2+ quantum dots/SiO2 nanocomposites

“…[1][2][3][4]. Among the widely studied II-VI semiconductor nanomaterials, ZnS has great advantages as follows: (1) low toxicity, (2) high photostability, (3) relative lower price, (4) simple synthesis procedure [5]. It is well known that doping Mn 2?…”