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<p>Hybrid organic–inorganic matrices offer a powerful platform for tailoring the properties of fluorescent dyes. Here, we engineer bisbenzimide dye-doped polycarbonate (PC)/silica films&#xa0;via sol–gel synthesis&#xa0;to achieve precisely tunable optical and thermal characteristics.&#xa0;The synthesis involves a controlled acid-catalyzed sol–gel process with tetraethoxysilane (TEOS) as the silica precursor.&#xa0;FTIR confirms the formation of a covalent silica network and reveals specific hydrogen-bonding interactions between the polymer carbonyl groups and surface silanols, indicating strong interfacial adhesion. The hybrid host matrix induces a distinct red shift in absorption and a blue shift in the dye's fluorescence emission by modulating the TEOS/PC ratio and dye concentration. Thermogravimetric analysis (TGA) reveals that increasing the inorganic silica content from 20 to 80% elevates the primary polymer decomposition temperature by approximately 200 °C, from 365 °C to 560 °C, and enhances the residual char yield. The enhanced thermal stability is directly attributed to the silica network acting as a protective barrier. The systematic correlation between sol–gel synthesis parameters, composition, and final spin-coated film properties demonstrates the efficacy of this approach.&#xa0;The study provides valuable insights into the design of TEOS/PC hybrid films with tunable properties for diverse technological applications.</p>

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Optical and thermal properties of bisbenzimide-doped polycarbonate/silica hybrid films synthesized via sol–gel

  • 期刊论文

  • 发表日期：

    2026年2月10日

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  • Seenaa I. Hussein,
  • Nadia A. Ali,
  • Alhafez M. Alraih

摘要

Hybrid organic–inorganic matrices offer a powerful platform for tailoring the properties of fluorescent dyes. Here, we engineer bisbenzimide dye-doped polycarbonate (PC)/silica films via sol–gel synthesis to achieve precisely tunable optical and thermal characteristics. The synthesis involves a controlled acid-catalyzed sol–gel process with tetraethoxysilane (TEOS) as the silica precursor. FTIR confirms the formation of a covalent silica network and reveals specific hydrogen-bonding interactions between the polymer carbonyl groups and surface silanols, indicating strong interfacial adhesion. The hybrid host matrix induces a distinct red shift in absorption and a blue shift in the dye's fluorescence emission by modulating the TEOS/PC ratio and dye concentration. Thermogravimetric analysis (TGA) reveals that increasing the inorganic silica content from 20 to 80% elevates the primary polymer decomposition temperature by approximately 200 °C, from 365 °C to 560 °C, and enhances the residual char yield. The enhanced thermal stability is directly attributed to the silica network acting as a protective barrier. The systematic correlation between sol–gel synthesis parameters, composition, and final spin-coated film properties demonstrates the efficacy of this approach. The study provides valuable insights into the design of TEOS/PC hybrid films with tunable properties for diverse technological applications.