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Preparation and Properties of Organic-inorganic Nanoparticles Hybrid Photorefractive Material

Author: WuYiWen
Tutor: HuangJun
School: Wuhan University of Technology
Course: Materials Science
Keywords: Photorefractive Nonlinear molecule Glass transition temperature Organic - Inorganic Nanocomposite Two wave coupling
CLC: TB383
Type: Master's thesis
Year: 2005
Downloads: 124
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Abstract


Photorefractive materials in optical information processing field for its broad application prospects attracting much attention, organic - inorganic composite photorefractive materials because of improved mechanical properties of materials and so has a distinct advantage and become a research focus. In recent years, organic - inorganic nanocomposites because of possible advantages of both organic and inorganic gradually developed into organic - inorganic composite fields is an important branch. Therefore, organic - inorganic nanocomposite photorefractive material is expected to be organic - inorganic functional complementation, collaborative optimization based on an increase of inorganic nanomaterials unique advantages in changing photorefractive charge transport mechanism system to improve system performance to achieve new photoconductive breakthrough. This dissertation analyzes the domestic and international organic-inorganic composite photorefractive materials research status, based on the current organic-inorganic nanocomposite photorefractive materials research problems, according to organic-inorganic nanocomposite photorefractive materials the basic requirements of each functional component designed and prepared PVK-CdS/DMNPAT organic-inorganic nanocomposite photorefractive materials, characterization and synthesis of each component photorefractive materials photorefractive degeneration can do a more systematic study. This thesis includes the following three aspects: (1) legal synthesized using diazo dyes DMNPP, and the introduction of long-chain alkyl-C 4 H 9 Another synthesized diazo dye DMNPAT. Both the structure and the photorefractive systems and corresponding glass transition temperature and the polarization treatment changes in the material properties were characterized and tested. DMNPP melting point of 173 ℃, corresponding to the photorefractive material glass transition temperature of 75 ℃; DMNPAT melting point 83 ℃, corresponding to the photorefractive material glass transition temperature of 29 ℃, the polarization of photorefractive materials can be performed at room temperature, polarization content of the component around the non-linear no significant changes. (2) chemical method using PVK matrix composites with nano particle size of the semiconductor CdS, CdS nanoparticles composite distribution, particle size between 15 ~ 25nm. Fluorescence spectroscopy of the chemical compound prepared PVK-CdS system was prepared with the traditional physical blending organic - inorganic nanocomposite system differences and advantages of the composite system PVK chemical bonding with CdS one hand improve the mechanical properties of materials , while the surface charge migration occurs between the two, to overcome the system photorefractive recombination of excited electrons, increase the concentration of carriers and the life and improve the photorefractive material within the photoinduced charge and electric field formation rate strength, thereby improving system performance photorefractive materials. (3) designed and prepared for a two-wave coupling PVK-CdS/DMNPAT photorefractive experiment samples, the samples were double-coupled light energy experiments, no external electric field, the two light beams emitted energy occurred transfer, indicating that the material has the photorefractive effect, and gained 86.24 cm -1 coupling gain coefficient.

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