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<p>In this study, pure polyvinyl alcohol (PVA) and Rhodamine 6G-Fluorescein-doped PVA (Rh6G-F/PVA) films were synthesized via a simple solution casting method at room temperature (23&#xa0;°C), using 15&#xa0;mL of each dye solution. The optical properties were characterized using UV–Vis spectroscopy in the range of 200–800&#xa0;nm. The incorporation of Rh6G and Fluorescein dyes into the PVA matrix resulted in a redshift in the absorption peaks and increased absorbance intensity. The optical band gap (E<sub>g</sub>) decreased from 5.65&#xa0;eV for the Rh6G-F dye solution to 5.16&#xa0;eV after incorporation into PVA, indicating enhanced interaction and optical response. Thermal treatment of Rh6G-F/PVA films at 30–70&#xa0;°C revealed further E<sub>g</sub> variations, with a minimum of 4.90&#xa0;eV at 40&#xa0;°C and a slight increase to 5.18&#xa0;eV at 70&#xa0;°C. These changes are attributed to thermally induce molecular reorganization and dye-polymer interactions. The highest temperature sensitivity (~ 36.28%) was recorded at 40&#xa0;°C. These findings highlight the potential of Rh6G-F/PVA composite films as thermally tunable optical materials for sensing and photonic applications.</p>

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Thermal effects on the optical behavior and sensitivity of Rh6G-F/PVA composite films

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Walaa B. Abdalmuhdi,
  • Mahasin F. Hadi Al-Kadhemy,
  • Khaldoon N. Abbas,
  • Asrar Abdulmunem Saeed

摘要

In this study, pure polyvinyl alcohol (PVA) and Rhodamine 6G-Fluorescein-doped PVA (Rh6G-F/PVA) films were synthesized via a simple solution casting method at room temperature (23 °C), using 15 mL of each dye solution. The optical properties were characterized using UV–Vis spectroscopy in the range of 200–800 nm. The incorporation of Rh6G and Fluorescein dyes into the PVA matrix resulted in a redshift in the absorption peaks and increased absorbance intensity. The optical band gap (Eg) decreased from 5.65 eV for the Rh6G-F dye solution to 5.16 eV after incorporation into PVA, indicating enhanced interaction and optical response. Thermal treatment of Rh6G-F/PVA films at 30–70 °C revealed further Eg variations, with a minimum of 4.90 eV at 40 °C and a slight increase to 5.18 eV at 70 °C. These changes are attributed to thermally induce molecular reorganization and dye-polymer interactions. The highest temperature sensitivity (~ 36.28%) was recorded at 40 °C. These findings highlight the potential of Rh6G-F/PVA composite films as thermally tunable optical materials for sensing and photonic applications.