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<p>Gold nanoparticles were synthesized based on the Turkevich method using hydrogen tetrachloroaurate trihydrate (HAuCl₄·3H₂O) as the precursor, with heating by microwave irradiation and varying the reaction time at 3, 5, 7, 10, and 15&#xa0;min. Three series of experiments were formulated employing different reducing agents: series one with sodium citrate tribasic dihydrate (Na₃Ct), series two with sodium potassium tartrate (KNaTrt), and series three with sodium borohydride (NaBH₄). Subsequently, characterization was carried out to determine the particle size distribution in dispersion and the zeta potential (ζ) to evaluate colloidal stability, the absorbance of the surface plasmon resonance (SPR), and scanning electron microscopy (SEM). Finally, the effect of thermo-optical properties was analyzed using the photopyroelectric technique. The results obtained showed a correlation between the optical and structural properties with the type of reducing agent and the reaction time. This has relevance in the field of photodynamic therapies, pharmaceutical industry, and nanotechnology.</p> Graphical abstract <p></p>

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Study of the optical and structural properties of gold nanoparticles synthesized by microwave irradiation using the photopyroelectric technique: Influence of reaction time and reducing agent

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Andrea Marisol Medina Solano,
  • Miguel Angel Hernandez Martinez,
  • José Abraham Balderas López,
  • Yesenia Sánchez Fuentes,
  • Cintia Proa Coronado

摘要

Gold nanoparticles were synthesized based on the Turkevich method using hydrogen tetrachloroaurate trihydrate (HAuCl₄·3H₂O) as the precursor, with heating by microwave irradiation and varying the reaction time at 3, 5, 7, 10, and 15 min. Three series of experiments were formulated employing different reducing agents: series one with sodium citrate tribasic dihydrate (Na₃Ct), series two with sodium potassium tartrate (KNaTrt), and series three with sodium borohydride (NaBH₄). Subsequently, characterization was carried out to determine the particle size distribution in dispersion and the zeta potential (ζ) to evaluate colloidal stability, the absorbance of the surface plasmon resonance (SPR), and scanning electron microscopy (SEM). Finally, the effect of thermo-optical properties was analyzed using the photopyroelectric technique. The results obtained showed a correlation between the optical and structural properties with the type of reducing agent and the reaction time. This has relevance in the field of photodynamic therapies, pharmaceutical industry, and nanotechnology.

Graphical abstract