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<p>Chiral plasmonic nanostructures are gaining prominence for applications in optical sensing, molecular recognition, and asymmetric catalysis due to their unique chiroptical responses. In this study, we report a controlled synthesis of chiral gold nanoparticles via a three-stage seed-mediated growth approach, employing L-cysteine as a chiral inducer and cetyltrimethylammonium bromide (CTAB) and ascorbic acid (AA) as growth-directing agents. We systematically investigated the influence of seed amount, gold precursor concentration, and the amount of cysteine on nanoparticle morphology and optical activity. Scanning and transmission electron microscopy (SEM, TEM), UV-Vis, and circular dichroism (CD) spectroscopy revealed that a balanced combination of 100 µL of seed and 100 µL of HAuCl₄, along with 7.5–10 µL of L-cysteine, yielded uniform, rhombic dodecahedral chiral nanoparticles with pronounced optical activity. Excessive cysteine concentrations led to aggregation and reduced chirality, emphasizing the importance of reagent balance. These findings offer critical insights into the tunable synthesis of chiral gold nanostructures and establish a foundation for their future applications in different technologies.</p>

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Controlled synthesis and characterization of chiral gold nanoparticles for enhanced optical activity

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Turki Alotebi,
  • Mohammad Tavakkoli Yaraki

摘要

Chiral plasmonic nanostructures are gaining prominence for applications in optical sensing, molecular recognition, and asymmetric catalysis due to their unique chiroptical responses. In this study, we report a controlled synthesis of chiral gold nanoparticles via a three-stage seed-mediated growth approach, employing L-cysteine as a chiral inducer and cetyltrimethylammonium bromide (CTAB) and ascorbic acid (AA) as growth-directing agents. We systematically investigated the influence of seed amount, gold precursor concentration, and the amount of cysteine on nanoparticle morphology and optical activity. Scanning and transmission electron microscopy (SEM, TEM), UV-Vis, and circular dichroism (CD) spectroscopy revealed that a balanced combination of 100 µL of seed and 100 µL of HAuCl₄, along with 7.5–10 µL of L-cysteine, yielded uniform, rhombic dodecahedral chiral nanoparticles with pronounced optical activity. Excessive cysteine concentrations led to aggregation and reduced chirality, emphasizing the importance of reagent balance. These findings offer critical insights into the tunable synthesis of chiral gold nanostructures and establish a foundation for their future applications in different technologies.