BiOI nanolamellas and BiSI nanowires were synthesized using Bi(NO3)3·5H2O, (NH2)2CS and I2 as reactants in the solvothermal process with ethanol as the system media. The as-prepared samples were characterized by X-ray powder diffraction (XRD), scanning electronic microscopy (SEM), Energy-Dispersive X-ray Spectrometer (EDS). The competitive growth of BiOI and BiSI were investigated by changing the quantity of (NH2)2CS. A possible reaction mechanism was proposed.
BiOCl nanosheets were annealed at different temperatures. The effect of annealing on structures and properties was characterized by X-ray diffraction (XRD), N2 adsorption-desorption, UV-visible diffuse reflectance spectroscopy (DRS) and photoluminescence spectroscopy (PL). The photocatalytic performance was evaluated by photodegrading Rhodamine B (RhB) under UV light irradiation. It was found oxygen vacancy defects (OVDs) could be generated during the annealing treatment and the best photocatalytic efficiency was obtained when the annealing temperature was 450 °C. The enhanced photocatalytic efficiency was ascribed to the high separation efficiency of the photogenerated electron-hole pairs due to the existence of the OVDs as positively charged centers.
Hairball-like bismuth trisulphide microcrystallines has been successfully prepared via one step solvothermal process and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM) techniques. The morphologies of the Bi2S3 microcrystallines were influenced by reaction time, temperature, the mole ratio of the reactants and concentration of starting materials, and the growth process has been proposed. The electrochemical behavior of Bi2S3 was investigated using the cyclic voltammetry.
Single crystalline Mn3O4 nanorods with diameters of 10-200 nm and lengths up to several microns have been synthesized by a simple hydrothermal method at a relatively low temperature. The products have been characterized by microscopic and spectroscopic techniques. From the Electron Spin Resonance (ESR) spectra of the products, hyperfine structure (six absorption peaks of ESR) of Mn2+ ion adding the Mn3+ ion signal was observed and results confirmed the nanorods showed paramagnetic behaviors.
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