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<p>This study reports the design of a lightweight, flexible photothermal sponge by embedding melanin-rich ink into a porous PDMS matrix. The resulting light-absorbing sponge (LAS) combines the broadband solar absorption capability of melanin nanoparticles with the structural advantages of PDMS. The unique molecular structure of melanin, featuring conjugated π-system, enables efficient π-electronic transitions and nonradiative relaxation, leading to a strong light-to-heat conversion. UV–vis–NIR diffuse reflectance (DRS) analysis confirms broad and intense absorption across the solar spectrum, while SEM images show uniform dispersion of melanin without pore blockage. The optimized sponge exhibits over 90% solar absorption and excellent photothermal performance under light irradiation. This facile, scalable strategy offers a bioinspired route to solar-thermal materials with potential applications in water purification, steam generation, and thermal management.</p> Graphical abstract <p></p>

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Bio-inspired photothermal nanocomposites: melanin-rich cuttlefish ink embedded in porous PDMS for solar vapor generation

  • 期刊论文

  • 发表日期：

    2025年11月20日

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  • Hossein Fattahimoghaddam,
  • Seung Jun Park,
  • Yong-Wook Jeong,
  • Donghyeon Lee,
  • Soorathep Kheawhom,
  • Yong Jin Jeong,
  • Tae Kyu An

摘要

This study reports the design of a lightweight, flexible photothermal sponge by embedding melanin-rich ink into a porous PDMS matrix. The resulting light-absorbing sponge (LAS) combines the broadband solar absorption capability of melanin nanoparticles with the structural advantages of PDMS. The unique molecular structure of melanin, featuring conjugated π-system, enables efficient π-electronic transitions and nonradiative relaxation, leading to a strong light-to-heat conversion. UV–vis–NIR diffuse reflectance (DRS) analysis confirms broad and intense absorption across the solar spectrum, while SEM images show uniform dispersion of melanin without pore blockage. The optimized sponge exhibits over 90% solar absorption and excellent photothermal performance under light irradiation. This facile, scalable strategy offers a bioinspired route to solar-thermal materials with potential applications in water purification, steam generation, and thermal management.

Graphical abstract