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Researches on In2O3（ZoN）10 Superlattice Nanowires and Surface Plasmon Enhanced Emission in Au/ZnO Compound Nanomaterials

Author: NiuBaoZuo
Tutor: ZhangXiTian
School: Harbin Normal University
Course: Condensed Matter Physics
Keywords: Hierarchical In2O3（ZnO）m superlattice Ostwald Ripening Surface Plasmon Photoluminescence
CLC: TB383
Type: Master's thesis
Year: 2011
Downloads: 35
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Abstract


The low-dimensional metal oxide semiconductors have attracted a great deal of attention due to their potential applications in nano-optoelectronic devices. ZnO is very suitable for photonic and electronic applications such as piezoelectric transducers, solar cells, sensors, and transparent conducting films. However, photoluminescence spectrum for ZnO usually consists of two emission peaks: a near-band edge emission peak originated from the recombination of free excitons and a visible emission band related to surface defect states. A large number of photo-generated electrons are trapped by surface states or impurities, resulting in the lower luminescent efficiency, which strictly influence the application of optoelectronic devices. From the device point of view, it is necessary to enhance luminescent efficiency of semiconductor materials. Recently, the research have indicated that the one-dimensional superlattcie nanomaterial with the quantum confinement effect and the surface plasmon coupling have been turned out to be an effective mean to improve the luminescent efficiency of optoelectronic semiconductor devices. Thus, we use the one-dimensional In2O3（ZnO）m （m=integer） superlattcie nanostructure and the surface plasmon to achieve the improved ultraviolet luminescent efficiency of ZnO materials.Here, we synthesize a new type of structurally modulated In2O3（ZnO）10 hierarchical nanostructures in high yield using a simple chemical vapor deposition method, at low temperature. The scanning electron microscopy and transmission electron microscopy results showed that In2O3（ZnO）10 superlattice nanoplatelets regularly arrayed along axial In2O3（ZnO）10 superlattice nanowires. The x-ray diffraction data for In2O3（ZnO）10 were obtained to fill the gap for JCPDS database. Low-temperature synthesis of hierarchical In2O3（ZnO）10 superlattice nanostructures is an important step toward fabricating highly densely integrated functional nanodevices.ZnO nanobelts were synthesized by chemical vapor deposition. And then Au nanoparticles were sputtered on the ZnO nanobelts. The enhancement of the ultraviolet emission of Au/ZnO composite nanobelts by surface plasmon was investigated. The enhancement mechanism was proposed based on the scattering and absorption by Au nanoparticles as well as the Purcell enhancement factor.

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