Solution-Based Route To Transitional Metal Oxides One-Dimensional Nanostructures: Synthesis, Characterization And Their Properties

One-dimensional (1-D) nanostructures have drawn continuous research attention because of their unique electrical, optical and magnetic properties different from that of bulk and nanoparticles as well as their potential applications in mesoscopic research and nanodevices. The main challenge in this area is how to precisely control the sizes, dimensionalities, compositions and crystal structures in nanoscale, which may serve as a powerful tool for the tailoring of physical/chemical properties of materials in a controllable way. In this dissertation, valuable explorations have been carried out on the new synthetic strategies (mainly solution-based routes) to transtional metal oxides (TMO) one-dimensional nanostructures, the synthesis of new-type 1-D TMO as well as their formation mechanism and the novel physical/chemical properties of the as-obtained new-type nanostructures. The main points can be summarized as follows:A rational low-temperature hydrothermal synthetic way has been developed to selectively prepare MnO2 nanowires/nanotubes with different crystal structures, the formation of which is investigated in details and is believed to be closed related to the layer-structured ?-MnO2. A rolling mechanism has been introduced to explain the growth of MnO2 nanowires under hydrothermal conditions.Based on the anistropic structures of Lanthanide hydroxides, a new synthetic strategy has been established to synthesize rare earth nanowires, nanotubes and Inorganic fullerene-like nanostructures, and some preliminary optical properties have been studied. Owning to the interesting combination of novel nanostructures and functional compounds, these low-dimentional nanostructures can be expected to bring some new opportunities in vast research areas of and application in biology, catalysts and optoelectronic devices.Series of Silicates nanowires and nanotubes have been successfully obtained from a novel water-ethanol mixed-solution hydrothemal route. The as-obtained nanotubes have narrow size distributions, large BET surface areas and excellent thermal/hydrothermal stability, and have shown great potential in gas separation/adsorption and catalysis fields.A facile method has been illustrated to control the dimensionality of seris of transtional metal oxides including ion, nickel, cobalt and molybdenum.