Synthesis And Optics Property Of Bi Catalyzed, Doped And Modified ZnO Nanowires

Znic oxide is a semiconductorr with a direct wide band gap of 3.37 eV at room temperature, its exciton has a binding energy up to 60 meV. The properties of ZnO nanowires can be adjusted by the metal element Bi doping techniques,which is rich in the electronic shell structure.It can effectively adjust the surface state of ZnO nano-structures in order to make some new the properties and applications. The main results of my research including the following aspects:(1) Using vapor transport method and Zn,BiI3 powder as source material, we successfully synthesized ZnO nanowires with different morphologies. The influences of temperature, vacuum pressure, O2 pressure on the ZnO nanowires'growth were studied. And we found out the basic rules of Bi catalyzing ZnO nanowires and the characteristics of energy band by PL.(2) Using vapor transport method and Zn, Bi powder as source material, we synthesized Bi doped ZnO nanowires on silicon substrate with gold films and also detected the Bi content is 0.653% in ZnO:Bi nanowires through the XPS analysis. We analyzed photoluminescence (PL) spectrum of the ZnO: Bi nanowires. We found and discussed that the PL spectrum peak has a red shift when the Bi-doped ZnO nanowires.(3) Using vapor transport method, we synthesized Bi surface-modified ZnO nanowires on ITO substrate.This result is confirmed through a series of experimental results and synthesizations. We compared the result with pure ZnO nanowires by employing Optical absorption and find out the influence of the modified layer's thickness to the Optical absorption. Moreover, we compared the nano energy structure by Tauc equation and presented the red shift of the possible reasons.