Preparation, Characterization of High-Luminescent and Magnetic Eu3+, Dy3+ Doped Superparamagnetic Nano-Fe3O4.

Pure superparamagnetic nano-Fe3O4 (SPMNPs) and Ln3+ (Eu3+, Dy3+) doped SPMNPs are successfully synthesized by reverse micelle method. The structure, morphology, magnetic properties and PL properties of the samples were characterized by XRD, FT-IR, TEM, PPMS, EDS and luminescence spectrometer respectively. The influences of Ln3+ doping amount on magnetic properties and PL properties were investigated in detail. The results show, with increasing of the Lna+ doping amount increasing, the morphologies and particle sizes of the doped Fe304 nanoparticles change, leading to saturation magnetization and coercivity changing accordingly. The change of lattice parameter and particle size was discussed based on Rietveld analysis of XRD pattern of the doped Fe3O4 nanoparticles. The coincidence of the ZFC and FC magnetization curves within the temperature range from 120.6 to 300 K, indicating that Fe3O4 nanoparticles are single domain super-paramagnetic.

Preparation and characterization of chain-like and peanut-like Fe3O4@SiO2 core-shell structure.

The size- and shape-controlled Fe3O4@SiO2 nanocomposites were successfully synthesized via the sol-gel method. The results showed that the size, shape, and property of the products were directly influenced by the amount of TEOS, and the concentration of water-based magnetic fluid in the coating process. The morphology and properties of the products were characterized by TEM, SEM, X-ray powder diffraction, IR and EDS. The Fe3O4@SiO2 composites with easily-controlled size arranged from 58 to 835 nm could be synthesized by adjusting the experimental parameters. When TEOS amount is 1 mL and the concentration of magnetic fluid were 30.0 and 10.0 mg/mL respectively, chain-like and peanuts-like well-dispersed Fe3O4@SiO2 particles with clear core-shell structure were obtained. These size- and shape-controlled Fe3O4@SiO2 composites may have potential application in the field of targeted drug delivery and MRI contrast agent.

Biomolecule-assisted green route to Sb2S3 crystals with three-dimensional dandelionlike patterns.

This paper describes a simple biomolecule-assisted solvothermal approach to fabricate the three-dimensional (3D) Sb2S3 microsphere with a wealth of novel morphologies in the presence of L-cysteine, which served as both the sulfur source and the directing molecule in the formation of antimony sulfide nanostructures. The effects of different solvents, and polyvinylpyrrolidone (PVP) on the morphology, structure, and phase composition of the as-prepared Sb2S3 products were discussed. The formation of 3D dandelionlike Sb2S3 microsphere was probably via the mechanism of the orientated aggregation growth of the Sb2S3 particles under the complexing action of L-cysteine, and co-action of the surfactant PVP. The absorption spectra of as-prepared 3D dandelionlike Sb2S3 structures show an optical shoulder band gap of 1.81 eV, which is near to the optimum for photovoltaic conversion.