Solution Synthesis And Its Structures And Properties Of SnO₂ Nanomaterials

In this thesis, several kinds of different morphologies of tin oxide nanostructures, such as nanotubes, core-shell homogeneous microspheres and porous nanowire bundles were prepared via a solution method at a mild temperature. Morphologies and microstructures of the as-synthesized products were characterized by X-ray diffraction, Raman spectrometer, scanning electron microscope and high-resolution transmission electron microscope. Effect of growth parameters on the morphologies of the as-obtained SnO₂ nanostructures were investigated, the growth mechanisms of several unique nanostructures were proposed and the Cathodeluiminescence, photocatalytic and electrochemical property of several nanostructures were also studied.Tin oxide microspheres were synthesized by using SnCl₄·5H₂O and Sodium hydroxide as the raw materials through a simple hydrothermal method at 200 oC with the assistance of hexamethylenetetramine. Microstructures of the product were characterized through XRD, SEM, TEM and Raman spectroscopy. The results show that the SnO₂ core-shell microspheres have the rutile type tetragonal phase. The reaction time, reaction temperature and solvent concentration were changed to explore the optimal synthesis conditions. Growth mechanism of the as-grown SnO₂ core-shell microspheres was proposed. The cathodoluminescence properties were finally investigated. The present SnO₂ core-shell microspheres can be used for building blocks to fabricate optoelectronics micro/nano-devices.Porous SnO₂ nanowire bundles were synthesized under an atmospheric condition by using SnCl₂·2H₂O and H₂C₂O₄·2H₂O as the raw materials, ethanol and polyethylene glycol mixture as the solvents. Functional tests of the nanowire bundles include photocatalytic effect in the degradation of Rhodamine B, and electrochemical property as the Li-ion battery anode.Different morphologies of one-dimensional SnO₂ nanostructures were synthesized using multi-walled carbon nanotubes as the template by a hydrothermal method in different conditions. These nanostructures include nanotubes, nanorods and nanospheres. The contrast test found that the reaction temperature, reaction time and the concentration of NaOH have a certain extent effect to product morphology. TEM and XRD results show that products have the rutile type tetragonal phase.