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<p>The synthesis of gold nanorods with precisely tunable dimensions and optical properties is of great interest due to their broad applications, particularly in biomedicine. In this work, we present a seedless synthesis strategy employing 1,7-dihydroxynaphthalene as a reducing agent to produce high-quality gold nanorods with exceptional precision. By optimizing the sodium borohydride concentration to 2.54 µM, we achieved the facile preparation of gold nanorods with a relatively small diameter of 11.8&#xa0;nm, linearly tunable surface plasmon resonance extinction up to 1061&#xa0;nm, and outstanding stability and reproducibility. The photothermal conversion efficiency of the synthesized nanorods reached 43.94% at 808&#xa0;nm—obviously higher than the 34.33% efficiency obtained via conventional seed-mediated methods. Furthermore, coating the rod with a mesoporous silica layer effectively mitigated the CTAB-induced cytotoxicity over a wide range of nanorods concentrations. These findings not only offer new insights into the distinctions between seeded and seedless synthesis strategies but also establish a robust foundation for the practical application of gold nanorods in biomedical and optoelectronic fields.</p>

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Seedless synthesis of high-quality gold nanorods with highly tunable surface plasmon resonance wavelength

  • 期刊论文

  • 发表日期：

    2025年10月23日

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  • Zhiwen Jiang,
  • Feifei Chen,
  • Yuyang Guo,
  • Yanjun Mo,
  • Anhua Wei,
  • Qingqing Xiang,
  • Qianwei Tang,
  • Hua Yao,
  • Zihua Wu

摘要

The synthesis of gold nanorods with precisely tunable dimensions and optical properties is of great interest due to their broad applications, particularly in biomedicine. In this work, we present a seedless synthesis strategy employing 1,7-dihydroxynaphthalene as a reducing agent to produce high-quality gold nanorods with exceptional precision. By optimizing the sodium borohydride concentration to 2.54 µM, we achieved the facile preparation of gold nanorods with a relatively small diameter of 11.8 nm, linearly tunable surface plasmon resonance extinction up to 1061 nm, and outstanding stability and reproducibility. The photothermal conversion efficiency of the synthesized nanorods reached 43.94% at 808 nm—obviously higher than the 34.33% efficiency obtained via conventional seed-mediated methods. Furthermore, coating the rod with a mesoporous silica layer effectively mitigated the CTAB-induced cytotoxicity over a wide range of nanorods concentrations. These findings not only offer new insights into the distinctions between seeded and seedless synthesis strategies but also establish a robust foundation for the practical application of gold nanorods in biomedical and optoelectronic fields.