| Due to their novel optical, electronic and magnetic properties, bismuth based micro- /nano-materials have potential applications in many fields, such as ferroelectric material, magnetic materials, lithium batteries, catalysts, antibacterial materials and photoluminescence. Therefore, it has attracted much interest to controlled synthesize bismuth based micro- /nano-materials with various morphologies, to study the size- or shape-dependent properties, and to find their new applied fields. On the other hand, there are abundant resources of bismuth in our country. It is predominant for us to extend the applications of bismuth based materials in industrial fields. In this thesis, we have successfully synthesized a series of bismuth based micro-/nano-materials with uniform size and morphology. The influence on the morphology and structure of the obtained products was studied. And their related formation mechanism and optical properties were also studied.(1) Bismuth sulfide crystals with various morphologies and different dimension have been synthesized by complexing agent-assisted hydro-/solvothermal processes. Influences of complex agent concentration, sulfur source and solvent polarity on the morphologies of products were studied. The photoelectric properties of bismuth sulfide crystals with different morphologies were also investigated.(2) Bismuth subcarbonate crystals with different morphologies were successfully synthesized by complexing agent-assisted hydrothermal process and their photocatalytic activities were tested respectively. On the basis of these synthesis methods, magnetic composite of bismuth subcarbonate as well as halogen doped bismuth subcarbonate were also prepared with their photocatalytic activities investigated. |
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