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首页> 外文期刊>Physica, B. Condensed Matter >Optical properties of polyimide/silica nanocomposite
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Optical properties of polyimide/silica nanocomposite

机译：聚酰亚胺/二氧化硅纳米复合材料的光学性质

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摘要

The optical properties of thin films of polyimide/silica nanocomposites prepared via solgel process were investigated as a function of nanosilica particles content. Absorption and reflectance spectra were collected by a spectrophotometer giving UV-radiation of wavelength range 200800 nm. The optical data obtained were analyzed in terms of absorption formula for non-crystalline materials. The calculated values of the optical energy gap and the width of the energy tails of the localized states exhibited silica concentration dependence. The direct optical energy gap for neat polyimide is about 1.95 eV, and decreases to a value of 1.8 eV for nanocomposite of 25 wt% nanosilica content. It was found that the calculated refractive index and dielectric constants of nanocomposites increase with silica particles content. The overall dependence of the optical and dielectrical constants on silica content in polyimide matrix is argued on the basis of the observed morphology and overlap of the localized energy sates of different color centers. The EMT model was fitted to the observed dielectric data.
机译：研究了通过溶胶凝胶法制备的聚酰亚胺/二氧化硅纳米复合材料薄膜的光学性质与纳米二氧化硅颗粒含量的关系。用分光光度计收集吸收和反射光谱，给出波长范围为200800 nm的紫外线。根据非晶态材料的吸收公式分析了获得的光学数据。光学能隙和局部态的能量尾部宽度的计算值表现出二氧化硅浓度依赖性。纯净聚酰亚胺的直接光能隙为1.95 eV，对于25 wt％纳米二氧化硅含量的纳米复合材料，其直接光能隙减小至1.8 eV。发现纳米复合材料的计算出的折射率和介电常数随二氧化硅颗粒含量的增加而增加。光学和介电常数对聚酰亚胺基质中二氧化硅含量的总体依赖性是根据观察到的形态和不同色心的局部能态的重叠来提出的。 EMT模型适合观察到的介电数据。

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