Preparation And Properties Research On 1-D ZnO Nanomaterial

Zinc oxide(ZnO) is an important wide band gap(Eg=3.37 eV) semiconductor material.Recently,one dimensional ZnO nanomaterials have attracted more and more attention due to potential applications in ultraviolet(UV) optoelectronic devices.In this thesis we synthesized one dimensional ZnO nanosturctures by a simple chemical vapor deposition method,and the influence of different prepared parameters on the surface morphology of ZnO film were studied.Besides that,the growth mechanisms, optic properties,piezoelectricity and wettability of ZnO nanorod arrays were also investigated.The details are listed below:Studied the influence of the temperature and oxygen pressure changed on the morphology of ZnO nanostructure.The results indicate that with the change of temperature and oxygen pressure,the morphology of ZnO nanostructure will change regularly.Base on this,we got the best prepared parameters for ZnO nanorod arrays.Growth mechanism of well-aligned ZnO nanorod was researched by taking SEM,TEM and EDS as test and analysis methods.Photoluminescence PL spectra of this well-aligned ZnO nanorod is consist of strong ultraviolet(UV) luminescence peak at 3.27 eV and visible luminescence at 2.47 eV.Micro-nano multi-scale ZnO nanostructures were synthesized by chemical vapor deposition method on Si(100) substrate.PL spectra at room temperature showed an intense near-band-gap ultraviolet(UV) emission peak,but no deep level emission related impurities or defects.Room temperature UV emission resulted from two optical transition,one related to the ZnO free excition and the other related to the free-to-bound(FB) transition of the free cawier.The piezoelectricity properties of ZnO nanorod arrays with different density were investigated by atomic force microscope tip in contact mode.The results show that Piezo response signal can be stronger with distance between ZnO nanorods increased.The piezoelectricity principles of ZnO nanorods with low density were also studied.The wettability of ZnO films with different surface morphology were investigated by contact angle apparatus.The results indicate that the contact angle on the surface of ZnO film can be changed by changing the surface morphology.