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Investigation on the optical properties of (PVP/PVA)/Al2O3 nanocomposite films for green disposable optoelectronics
Physica B: Condensed Matter ( IF 2.8 ) Pub Date : 2021-03-24 , DOI: 10.1016/j.physb.2021.412989
Priyanka Dhatarwal , R.J. Sengwa

The ultraviolet–visible (UV–Vis) range (200–800 nm) optical behaviour of nanocomposite films consisted of poly (vinyl pyrrolidone)/poly (vinyl alcohol) (PVP/PVA) blend matrix and alumina (Al2O3) nanofiller (1–5 wt%) was characterized for their eco-friendly green technology-based optoelectronic device applications. Absorbance, transmittance, and reflectance spectra of the (PVP/PVA)/Al2O3 films were analyzed to determine absorption coefficient, energy band gaps (direct and indirect), and Urbach energy. The non-linear decrease in band gap values of these composites with increasing amount of Al2O3 in the polymer matrix was explained. The wavelength-dependent values of refractive index, extinction coefficient, complex dielectric permittivity, and optical conductivity of these hybrid nanocomposites enhanced non-linearly with increasing filler concentration, as well as the dispersive energy, single oscillator strength, and optical susceptibility increased gradually. All these optical parameters values of the (PVP/PVA)/Al2O3 nanocomposites are found controllable by Al2O3 contents and reasonably comparable with the results of other similar types of composites.



中文翻译:

绿色一次性光电器件(PVP / PVA)/ Al 2 O 3纳米复合薄膜的光学性能研究

纳米复合膜的紫外-可见(UV-Vis)范围(200-800 nm)光学行为由聚(乙烯基吡咯烷酮)/聚(乙烯醇)(PVP / PVA)混合基质和氧化铝(Al 2 O 3)纳米填料组成(1-5 wt%)的特点是其基于绿色技术的环保型光电设备应用。分析(PVP / PVA)/ Al 2 O 3薄膜的吸收光谱,透射光谱和反射光谱,以确定吸收系数,能带隙(直接和间接)和Urbach能量。随着Al 2 O 3含量的增加,这些复合材料的带隙值呈非线性下降趋势解释了聚合物基体中的化合物。这些杂化纳米复合材料的折射率,消光系数,复介电常数和光导率随波长的变化随着填料浓度的增加而非线性增加,色散能,单振子强度和光化率逐渐增加。发现(PVP / PVA)/ Al 2 O 3纳米复合材料的所有这些光学参数值可由Al 2 O 3含量控制,并且可以与其他类似类型的复合材料的结果合理地比较。

更新日期:2021-04-02
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