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<p>The present study investigates the effects of carbon dots on the photoluminescent, thermo-optical, and wetting properties of polyvinyl alcohol (PVA) films. By doping PVA with carbon dots derived from methyl red (CD-MR) at different concentrations, fluorescent nanocomposite films are obtained, which exhibit mechanical and wetting properties similar to those of pristine PVA films. Regarding the spectral properties, our results show that the confinement in a polymeric matrix leads to significant changes in the absorption and fluorescence spectra of such carbon dots, where a substantial hypsochromic shift is observed in the CD-MR photoluminescence. Using the time-resolved z-scan technique, the thermo-optical properties of nanocomposite films are also investigated. The CD-MR addition induces a self-defocusing behavior in PVA films, with the thermo-optical coefficient increasing as the concentration of guest nanoparticles is enhanced. Additionally, a gradual reduction in the thermal diffusivity of PVA films is observed, indicating that the addition of nanoparticles affects heat transport in polymeric samples.</p>

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Photoluminescent and thermo-optical properties of polymeric films doped with carbon dots derived from methyl red

  • 期刊论文

  • 发表日期：

    2025年9月10日

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  • Lavínia M. Braga,
  • Raul L. Ferreira,
  • Lucas S. Ferreira,
  • Italo N. de Oliveira

摘要

The present study investigates the effects of carbon dots on the photoluminescent, thermo-optical, and wetting properties of polyvinyl alcohol (PVA) films. By doping PVA with carbon dots derived from methyl red (CD-MR) at different concentrations, fluorescent nanocomposite films are obtained, which exhibit mechanical and wetting properties similar to those of pristine PVA films. Regarding the spectral properties, our results show that the confinement in a polymeric matrix leads to significant changes in the absorption and fluorescence spectra of such carbon dots, where a substantial hypsochromic shift is observed in the CD-MR photoluminescence. Using the time-resolved z-scan technique, the thermo-optical properties of nanocomposite films are also investigated. The CD-MR addition induces a self-defocusing behavior in PVA films, with the thermo-optical coefficient increasing as the concentration of guest nanoparticles is enhanced. Additionally, a gradual reduction in the thermal diffusivity of PVA films is observed, indicating that the addition of nanoparticles affects heat transport in polymeric samples.