In the present work, PVA and various concentrations of FeCl3 doped PVA polymer were prepared and optical studies like IR and UV/Visible analysis were carried out on them in solution form also the cast films were examined for their conductance. The variation of optical band gap of PVA polymer with the addition of Fe3+ transition metal ion has been determined by the Tauc plot method. It is found that the optical band gap and the transmittance of the polymer solutions being decreased with the increase in the concentration of Fe3+ ion, and thus obeys Beer's Law. This is supported by conductivity obtained for these polymers and FT-IR spectra which shows the stretching of the various bonds of the polymer due to the addition of transition metal (Fe3+) ions.

中文翻译：

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FeCl3掺杂PVA聚合物的光学和导电性能研究

在目前的工作中，制备了 PVA 和各种浓度的 FeCl3 掺杂的 PVA 聚合物，并对它们的溶液形式进行了光学研究，如红外和紫外/可见光分析，还检查了流延膜的电导率。加入 Fe3+ 过渡金属离子后 PVA 聚合物光学带隙的变化已通过 Tauc 绘图法确定。发现聚合物溶液的光学带隙和透光率随着Fe3+离子浓度的增加而减小，符合比尔定律。这得到了这些聚合物的电导率和 FT-IR 光谱的支持，FT-IR 光谱显示了由于添加过渡金属 (Fe3+) 离子而导致聚合物各种键的拉伸。