Search

Abstract: The amorphous MoS2 nanoparticles have been synthesized by a simple oxidation–reduction reaction in an aqueous solution. A series of products with different morphologies, such as MoS2 nanospheres, inorganic fullerene-like nanospheres, nanorods and Mo bended rods, can be obtained by annealing the amorphous MoS2 nanoparticles under N2 atmosphere under 400–1200°C. These products have been characterized by X-ray diffraction, field emission scanning electronic microscopy, transmission electron microscopy and high-resolution transmission electron microscopy in detail. The possible transformation mechanism for the structure has been discussed based on the experimental results. In addition, the optical properties of IF-MoS2 have also been performed by UV–vis absorption spectroscopy. [Copyright &y& Elsevier]

Abstract: MoS2 films were prepared by chemical bath deposition using Ni interlayer, which was deposited electrolessly on Si substrates. The combined techniques of X-ray diffraction, field emission scanning electron microscope (FESEM), Raman spectroscopy and optical reflective spectra were used for characterization of MoS2 films at different conditions. Results indicated that the type-II MoS2 films oriented with their c axis perpendicular to the plane of Si substrates were obtained at annealing temperature greater than 800°C. The effect of nickel on the orientation of 2H–MoS2 crystallites can be explained on the basis of binary Ni–S phase diagram. The thin films have a direct optical bandgap of 1.87eV as a result of optical reflective spectra. This article offers an easy way to prepare type-II MoS2 film of better crystallite. [Copyright &y& Elsevier]

Abstract: The composite of hollow glass microspheres coated by SnO2 nanoparticles has been successfully fabricated via sol-gel method. The phase structures, morphologies, particle size, shell thickness, chemical compositions of the composite have been characterized by XRD, FESEM, and EDX. The results show that SnO2 coating on hollow glass microspheres can be achieved, and the coating layers are constituted by SnO2 nanoparticles of mean size ca. 15 nm. The SnO2 coating layers grow thicker with the increased concentration of SnCl4. The effects of parameters (reaction temperature, concentration of NaOH and SnCl4, and time) were investigated to yield SnO2 coating on hollow glass microspheres, and the UV–vis absorption spectra of the composites were studied. [Copyright &y& Elsevier]