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Preparation. Characterization and Photoluminescence Properties of SiO2-ZnO Composite Nanofibers

Author: GuoYongJun
Tutor: ShaoChangLu
School: Northeast Normal University
Course: Materials Physics and Chemistry
Keywords: Composite nanofibers Sol-gel method Electrospinning Polyethylene pyrrolidone Zinc oxide
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 81
Quote: 0
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Abstract


One-dimensional semiconductor nanostructures has a broad application prospects in the field of optics, optoelectronic devices , and dielectric . One-dimensional semiconductor nanocrystals with good confinement , uniform geometry , crystalline easy - to - control advantages , making it the most active areas in recent years, semiconductor research . Different types and morphology of a one-dimensional semiconductor nanomaterials be synthesized , one-dimensional semiconductor nanocrystals has made a breakthrough in the development toward the device . The papers by sol - gel method using electrospinning technology , select polyvinylpyrrolidone (PVP Mn = 900000) and a variety of inorganic salts forequarters was , after high temperature calcination prepared SiO 2 -ZnO composite nanofibers , provides a new way for the preparation of one-dimensional composite inorganic nanomaterials . Using scanning electron microscopy , X-ray powder diffraction , infrared spectroscopy , photoluminescence luminous characterization means of the samples were analyzed . The results of the study showed that , after heat treatment of the composite nanofibers obtained The the pure SiO 2 - ZnO composite nanofibers , fiber morphology for the rule of one-dimensional tubular structure , the surface is smooth , and the diameter of 300 - At 900nm, the diameter is more evenly distributed . The study found that the uncalcined composite nanofibers defect states in light-emitting strong ; ultraviolet luminous efficiency gradually increased as the calcination temperature is gradually increased , the luminous efficiency of defect states gradually weakened .

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