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<p>Silver nanoparticles were synthesized by laser ablation of a metallic silver target in deionized water using focused 1064&#xa0;nm nanosecond pulses. A fraction of the colloid was subsequently irradiated with unfocused 532&#xa0;nm pulses under three regimes to investigate laser-induced modifications in optical response, hydrodynamic size, and colloidal evolution. UV–Vis spectroscopy was performed immediately after irradiation and during 21&#xa0;days of storage, while hydrodynamic size and zeta potential were measured after 24&#xa0;h in parallel batches. Immediately after irradiation, all treated samples exhibited a blue shift of the localized surface plasmon resonance (LSPR), a reduced spectral width (FWHM), and increased absorbance, consistent with nanoparticle fragmentation. The optical absorption edge derived from Tauc analysis showed high sensitivity to the irradiation regime, providing a complementary descriptor to LSPR for assessing size-dependent changes and early-stage evolution. During storage, all samples exhibited a red shift of the LSPR, spectral broadening, and a decrease in the optical edge, reflecting nanoparticle association and increasing heterogeneity. Zeta-potential measurements revealed less negative values for the irradiated colloids, indicating reduced electrostatic stabilization. Although optical and electrostatic descriptors did not yield a unique stability ranking among irradiated samples, all parameters consistently identified the non-irradiated colloid as the relatively most stable system. Overall, these results demonstrate that the operational optical absorption edge is a sensitive and complementary metric for evaluating laser-induced modifications and long-term colloidal behavior in silver nanoparticle systems.</p>

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Immediate and temporal evolution of the localized surface plasmon resonance and optical absorption edge in colloidal silver after 532 nm pulsed-laser irradiation

  • 期刊论文

  • 发表日期：

    2026年3月24日

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  • Miguel A. Valverde-Alva,
  • Hector E. Paredes-Aguilar,
  • Julio D. Alvarado-Lozano,
  • Jhenry F. Agreda-Delgado,
  • Claver W. Aldama-Reyna,
  • Luis M. Angelats-Silva

摘要

Silver nanoparticles were synthesized by laser ablation of a metallic silver target in deionized water using focused 1064 nm nanosecond pulses. A fraction of the colloid was subsequently irradiated with unfocused 532 nm pulses under three regimes to investigate laser-induced modifications in optical response, hydrodynamic size, and colloidal evolution. UV–Vis spectroscopy was performed immediately after irradiation and during 21 days of storage, while hydrodynamic size and zeta potential were measured after 24 h in parallel batches. Immediately after irradiation, all treated samples exhibited a blue shift of the localized surface plasmon resonance (LSPR), a reduced spectral width (FWHM), and increased absorbance, consistent with nanoparticle fragmentation. The optical absorption edge derived from Tauc analysis showed high sensitivity to the irradiation regime, providing a complementary descriptor to LSPR for assessing size-dependent changes and early-stage evolution. During storage, all samples exhibited a red shift of the LSPR, spectral broadening, and a decrease in the optical edge, reflecting nanoparticle association and increasing heterogeneity. Zeta-potential measurements revealed less negative values for the irradiated colloids, indicating reduced electrostatic stabilization. Although optical and electrostatic descriptors did not yield a unique stability ranking among irradiated samples, all parameters consistently identified the non-irradiated colloid as the relatively most stable system. Overall, these results demonstrate that the operational optical absorption edge is a sensitive and complementary metric for evaluating laser-induced modifications and long-term colloidal behavior in silver nanoparticle systems.