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<p>Gold nanoparticles (Au-NPs) have garnered considerable interest in recent decades due to their unique properties encompassing localized surface plasmon (LSP) resonance, excellent biocompatibility, and ease of surface functionalization. which make them attractive for diverse applications including sensing, catalysis, and biomedical technologies. One of the less extensively studied optical effects associated with Au-NPs is surface-enhanced visible absorption (SEVA), which arises from strong light–matter interactions facilitated by LSP excitation. This study investigates SEVA in an aqueous medium by examining the interaction between Au-NPs and the azo dye Disperse Red 1 (DR1). Au-NPs were synthesized in water and transferred into an organic solvent compatible with DR1. Different Au-NP concentrations were then mixed with DR1, and the optical response was evaluated using UV–Vis spectroscopy. The results demonstrate a significant enhancement in DR1 absorption due to the presence of Au-NPs, highlighting the potential of plasmonic nanoparticles to modulate dye optical properties in solution-based systems.</p> Graphical abstract <p></p>

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Synthesis of spherical gold nanoparticles and enhancement of dye absorption in solution by SEVA

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Amina Badir,
  • Siham Refki,
  • Zouheir Sekkat

摘要

Gold nanoparticles (Au-NPs) have garnered considerable interest in recent decades due to their unique properties encompassing localized surface plasmon (LSP) resonance, excellent biocompatibility, and ease of surface functionalization. which make them attractive for diverse applications including sensing, catalysis, and biomedical technologies. One of the less extensively studied optical effects associated with Au-NPs is surface-enhanced visible absorption (SEVA), which arises from strong light–matter interactions facilitated by LSP excitation. This study investigates SEVA in an aqueous medium by examining the interaction between Au-NPs and the azo dye Disperse Red 1 (DR1). Au-NPs were synthesized in water and transferred into an organic solvent compatible with DR1. Different Au-NP concentrations were then mixed with DR1, and the optical response was evaluated using UV–Vis spectroscopy. The results demonstrate a significant enhancement in DR1 absorption due to the presence of Au-NPs, highlighting the potential of plasmonic nanoparticles to modulate dye optical properties in solution-based systems.

Graphical abstract