Synthesis And Electochemical Property Of Selenide Nanomaterials

Selenide nanomaterials have unique optical, electrical, magnetic, photoelectric and thermoelectric properties, which makes them potential applications in solar cells, infrared detectors, photoelectric device, thermoelectric device and chemical sensors. Therefore, the study for selenide nanomaterials is a hot point in nanomaterial field.In this paper, PbSe nanotubes, Bi2Se3 nanotubes and SnSe2 nanoplates were respectively prepared by hydrothermal synthesis, in which the t-Se nanotubes were used as engaged-template that reacted with relevant metal ions. The selenides as-obtained were characterized by Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Thermogravimetric Analysis (TGA), etc. Furthermore, the formation mechanism of selenide nanomaterials was disscussed, and their electrochemical property was studied by the cyclic voltammetry.Our main work as follows:1. Synthesis and Electochemical Behavior of PbSe nanotubesFirst, the t-Se nanotubes were synthesized as our report. Then, with the hydrothermal synthesis, the t-Se nanotubes as-obtained were used as template reagent that reacted with Pb(NO3)2 to form PbSe nanotubes. Through a series of experiments, it was found that the reaction temperature and the molar ratio of reactants play an important role in formation of the PbSe nanotubes. The products obtained were characterized by XRD, TEM, SEM, XPS, etc. In addition, the formation mechanism and electochemical property of the PbSe nanotubes were studied.2. Synthesis and Electochemical property of Bi2Se3 nanotubes.By using the t-Se nanotubes prepared, Bi(NO3)3, and N2H4·H2O as Se source, Bi source and reducing agent respectively, the hexagon Bi2Se3 nanotubes were obtained at 160℃with hydrothermal synthesis. The products as-obtained were characterized by XRD, TEM, SEM, XPS, etc. Based on a series of experiments and characterizations, the effect factors and the formation mechanism of the Bi2Se3 nanotubes were discussed. Furthermore, the electrochemical behavior of the Bi2Se3 nanotubes was studied by the voltammetric technique in different medium, and the effect factors on the cyclic voltammograms of Bi2Se3 nanotubes, such as potential region, scan rate and the acidity of electrolyte solution, were discussed.3. Synthesis and Electochemical property of SnSe2 nanoplates.Depending on the strong deoxidization of N2H4 H2O, the Se4+ and Sn2+ in solution were respctively reduced to Se and Sn nanoparticles under hydrothermal condition. These fresh elemental nanoparticles, with high reactivity, could react with each other to form SnSe2 nanoparticles. The products as-obtained were characterized by XRD, TEM and SEM. By a series of experiments, the effect of the reaction temperature and the molar ratio of Sn and Se in precursors on the phase and composition of product was studied, and the formation mechanism of the SnSe2 nanoplates was disscussed. Finally, we also studied the electochemical property of the SnSe2 nanoplates.