Synthesization And Characterization Of Rare Earch Selenide

With the accelerated pace of global industrialization, world-wide energy shortage has become an important economic and social development factors. Using thermoelectric power generation and cooling, which is a great way to reuse the energy, but selecting the thermoelectric materials and technology is the key. Because of its applications do not require use of transmission parts, quiet work, no matter the abandoned, no environmental pollution, and the material properties of reliable, long life, is a broad prospect for environment protection and energy materials. Thermoelectric conversion efficiency mainly by the figure of merit (ZT) to decide, and now most of the thermoelectric material ZT<1(corresponding to thermoelectric conversion efficiency of<10%), however Rare earth selenide have excellent high temperature semiconductor performance, may usd for thermoelectric conversion material, so have important application in fabrication.In this dissertation, we try to explore suitable for experimental conditions that synthesis pure phase of lanthanum selenide(La2Se3) and synthesis La2O2Se nano-particles. La4O4Se3nanofibers. Ag@Ag2S nanoparticles. The as-prepared samples were characterized by XRD, SEM, EDS, UV-Vis and Electrochemical workstation. The results show that the pure phase lanthanum selenide(La2Se3) is difficult to synthesis, so the experimental conditions need further investigation; The La2O2Se nano-particles larger is not very good for the luminous intensity and electric performance research; The La4O4Se3nanofibers we prepared have an average diameter of48.84±8.65nm and good conductivity under certain conditions. The Core-shell structure Ag@Ag2S nanoparticles have good Electrochemical reversibility and high charge, which could applies to luminescence, electricity and magnetism composite functional materials wide application value.