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Preparation and Photoluminescence Study of Self Assembled ZnO Nanostructures and 1D ZnO: ZnFeO Photonic Crystal

Author: LiYun
Tutor: ZouBingSuo
School: Hunan University
Course: Condensed Matter Physics
Keywords: Nanomaterials Semiconductor Optical Waveguide Photoluminescence NSOM 1D photonic crystal ZnO
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 84
Quote: 1
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Abstract


Nano-materials have gained a tremendous amount of attention due to their novel physical and chemical properties which are different from their corresponding bulk materials. ZnO micro/nanostructures, including ultralong ZnO nanowires, self-assembled hierarchical ZnO nanostructrues, and nanoblets, nanoarrays, nanocombs, nanofeathers have been synthesized by the thermal evaporation methods. The ultralong nanowires and hierarchical ZnO nanostructrues have been analyzed in detail and the mechanism of crystal growth of ultralong ZnO has been explained. The waveguide behavior of an individual NW analyzed with NSOM exhibited ZnO NW is a useful waveguide cavity, which can transport the excited light to the ends of the NW and emitted toward the outside. The Raman spectra of hierarchical ZnO nanostructrues indicated strong multi-phonon scattering. PL spectra included a near band-edge UV excitation originating from the recombination of free exciton, a visible band due to electron transition from the shallow donor level of oxygen vacancies and zinc interstitials to the valence band and a shoulder peak related to the intrinsic defect structures. Uv-Vis spectra indicated strong quantum confinement effect. Morever, 1D ZnO:ZnFeO photonic crystal with with novel rectangular cross section were synthesized with a convenient one-step thermal evaporation method These MWs possess novel rectangular cross section which may be caused by the formation of cubic ZnFe2O4 and oriented based attachment mechanism. Room temperature Raman spectra suggested that the MWs possessing the typical peaks of pure ZnO NWs and the characteristic band of ZnFe2O4 have been indexed. Mappings of Raman spectra indicate periodic changes along the MWs. Moreover, the PL spectra displayed the resonant peaks due to the periodic doping of Fe, and in situ mappings were in corresponding with the Raman mapping and comfirm the MWs are 1D ZnO:ZnFeO PCs. This technique to produce F-P cavities along the MW may also be applied to prepare other TMs doped ZnO MWs. Such ZnO:ZnFeO MW photon crystal initiates a brand-new realm of 1D PC in oxide semiconductor. Furthermore, the novel emission property may have potential application in enhanced stimulated emission, engineered 1-D waveguides and nanoscale or microscale photonic devices.

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