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Research On Nano ZnO/High Silica Glass Composite Optical Material

Posted on:2016-02-11Degree:MasterType:Thesis
Country:ChinaCandidate:S R MaoFull Text:PDF
GTID:2191330479494056Subject:Materials science
Abstract/Summary:PDF Full Text Request
Zn O is a new direct band gap semiconductor material with a wide band gap of 3.37 e V, its exciton binding energy is up to 60 me V at room temperature, which is much larger than the room temperature ionization energy(26me V), it can be achieved exciton recombination luminescence at room temperature or high temperature. Zn O is an ideal material for short wavelength optoelectronic devices. Nano Zn O not only has the properties of zinc oxide, but also has the size effect, interface effect and other properties of nano materials, it exhibits more excellent photoelectric properties.Nano Zn O/glass composite material is a new application of nano Zn O. This composite material has potential applications in optical display, active fiber and other fields. In the conventional glass systems, high silica glass is known for its excellent performance of high mechanical strength, low thermal expansion coefficient, good chemical stability, resistance to high temperature, corrosion and erosion, etc.. If high silica glass and nano Zn O combined to form a new composite material, it will have unique optical properties. Nano porous glass after sintering can get high silica glass, and porous glass have adjustable nanopores, larger specific surface area and pore volume, good adsorption properties and other characteristics that is not only advantageous for the uniform doped of Zn O, but also avoiding fluorescence quenching caused by agglomeration of Zn O. So that it can improve the emission intensity of Zn O. This thesis mainly studies the preparation and optical properties of nano Zn O/high silica glass composite materials which provides theoretical guidance and practical bedding for its application in the photovoltaic area.This paper chooses Na2O-B2O3-Si O2 system as the basic composition of high silica glass. The composition goes through high-temperature melting, heat treatment phase, acid leaching, alkali treatment, and other processes to obtain high silica porous glass which is the intermediate products of high silica glass. This experiment studied on the influence of the glass component, heat treatment temperature and time, acid concentration, alkali time and other parameters on the pore structure of high silica porous glass. In this experiment, the high silica porous glass works as a carrier, using the water bath method to prepare nano Zn O. After sintering process, the pores of high silica porous glass are closed to form high silica glass, nano Zn O is wrapped in the body of high silica glass to form dense nano Zn O/high silica glass composite materials. The morphology, phase composition, component content, luminescent properties of the composite materials were characterized by SEM, XRD, XRF and PL.The results of this study shows that the size and distribution of nano-Zn O can be controlled by adjusting the nanopore of the porous glass, and the luminescence band of nano Zn O/high silica glass composite materials can be adjusted by the preparation process.
Keywords/Search Tags:porous glass, nano ZnO, high silica glass, composite optical materials
PDF Full Text Request
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