서강대학교

초록/요약

Part 1. Effect of Heterostructure of Magnetic and Optical Property in Diverse Iron Oxides We demonstrated that optical and magnetic properties of porous iron oxide nanorods obtained by hydrogenation at several annealing temperature (250, 300, 350, 400 oC). The outer (shell) layer and reduced iron oxide (core) in iron oxide nanocomposite is confirmed by transmission electron microscopy (TEM), Powder X-ray diffraction (PXRD), Rietveld analysis, X-ray photoelectron spectra (XPS), and N2 adsorption/desorption techniques. Optical and magnetic property of each sample was investigated by diffuse-reflectance UV-VIS absorption and superconducting quantum interference devices (SQUID). Part 2. TiO2 films with oriented anatase (001) facets and their photoelectrochemical property As an important metal oxide, anatase titanium dioxide has been widely investigated because of its many promising properties for catalysis and photocatalysis. The properties of anatase TiO2 crystals are largely determined by external surfaces exposed. Many efforts have been made to improve the percentage of high-reactive facets like (001) facets of anatase TiO2 to enhance its catalytic properties. TiO2 films with oriented anatase (001) facets grown on transparent conductive fluorine-doped tin dioxide substrate were prepared via a facile rubbing method and hydrothermal route. The obtained TiO2 film as a photoanode shows efficient photoelectrochemical water splitting ability(photocurrent). The presence of high-energy facets in titania improves significantly its adsorption, electronic, and photocatalytic properties, making this material attractive for various environmental and energy-related applications.