Abstract
Cadmium telluride (CdTe) and iron oxide nanoparticles doped silica nanospheres were prepared by a multistep method. Iron oxide nanoparticles were first coated with silica and then modified with amino group. Thereafter, CdTe nanoparticles were assembled on the particle surfaces by their strong interaction with amino group. Finally, an outer silica shell was deposited. The final products were characterized by X-ray powder diffraction, transmission electron microscopy, vibration sample magnetometer, photoluminescence spectra, Fourier transform infrared spectra (FT-IR), and fluorescent microscopy. The characterization results showed that the final nanomaterial possessed a saturation magnetization of about 5.8 emu g−1and an emission peak at 588 nm when the excitation wavelength fixed at 380 nm.
Highlights
Magnetic nanoparticles offer great potential in biomedical applications, including magnetic resonance imaging (MRI), targeted drug delivery, rapid biological separation, biosensors, and magnetic hyperthermia therapy
Scheme 1 Preparation procedure of multifunctional nanoparticles composed of iron oxide nanoparticles and cadmium telluride (CdTe) nanocrystals indicated quantum dots (QDs) can be assembled on the silica surface by amino group, and Liu et al [20] have modified the surface of silica coated iron oxide nanoparticles with CdSe by this principle
The preparation procedure was shown in Scheme 1, iron oxide nanoparticles were first coated with silica and it was modified with amino group
Summary
Magnetic nanoparticles offer great potential in biomedical applications, including magnetic resonance imaging (MRI), targeted drug delivery, rapid biological separation, biosensors, and magnetic hyperthermia therapy. Cadmium telluride (CdTe) nanoparticles, as an important II–VI semiconductor material, have attracted considerable attention over the past decades. They have some unique physical and chemical properties, such as marvelous brightness, narrow and size-tunable emission, fairly high quantum yields, and good chemical and photo stability. These properties make CdTe nanocrystals suitable for biological applications, fabricating photoelectron devices and solar cells [5,6,7,8,9,10,11]
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