Fabrication And Property Study Of One-dimensional Semiconductor Nanomaterials

In this dissertation, we fabricated one-dimensional semiconductor nanowires and nanotubes in the nanochannels of aluminum anodic oxide membrane (AAO) by electrochemical and chemical technique successfully, and characterized their morphologies and structures. The influencing factors, preparation mechanism and related properties were investigated in this dissertation.High ordinal aluminum anodic oxide membranes were fabricated in the oxalic acid electrolyte, by twice processes of the anodic oxidation. The microstructure of anodic aluminum oxide (AAO) film was particularly studied by AFM. It shows that except hexagonal pore arrays in AAO film there is a small microstructure like plum blossom along the surface of pore wall. The nanopore arrays are actually a highly ordered plum blossom arrays patterns.CdS semiconductor nanomaterials have been prepared by using hard templates and soft templates respectively. It was found that didn't dissolve the barrier layer and didn't deposite metal film during preparation of AAO, and CdS nanowires were prepared by dc electrodeposition in holes of AAO template. These nanowires have uniform diameters of about 75 nm, accorded with diameter of holes. Raman spectra of CdS nanowire was blue shifted, and fluorescent spectra of CdS nanowire showed that there was a emission peak at 573nm. Sodium dodecyl sulfate (SDS) as soft template, a simple ultraviolet photochemical reduction synthetic approach to preparing CdS nanocrystals with different morphologies is described (such as spherical, acicular-like, rod-like and worm-like shapes). The XRD pattern showed that the prepared CdS nanorods could be indexed to hexagonal phase (wurtzite structure). As expected, in the UV-vis pattern, the absorbance edge (λe=480 nm) of CdS nanomaterials was blue shifted relative to that of bulk CdS .The TiO₂ nanotubles and nanowires were assembled in the AAO template nanoholes by using Sol-gel method. The morphologies, structures and properties of TiO₂ nanotubles and nanowires were characterized by many kinds of physical methods, such as SEM, TEM, XRD and UV-vis. The results show that crystal structure of TiO₂ nanotubles is anatase. The UV-vis pattern showed that the...