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<p>Gold nanoparticles (AuNPs) present unique physicochemical properties at the nanoscale, such as localized surface plasmon resonance. However, AuNPs synthesized by chemical reduction methods may easily aggregate or precipitate, affecting especially their plasmonic properties. Chitosan is a natural polysaccharide that is highly effective as a stabilizing agent for metallic nanoparticles. In the present study, a surface-enhanced Raman scattering (SERS) substrate was constructed using chitosan-capped AuNPs (AuNP/CS), with high stability in time (at least 45 days) in three exciting wavelengths, 633, 785, and 1064 nm. The AuNP/CS nanocomposite precipitated in high pH and was easily resuspended by acetic acid solution even after 30 days of storage, resulting in resuspended AuNP/CS (AuNP/CS-Res). The AuNPs/CS-Res nanocomposite presented negative charge selectivity for the SERS study of dyes. AuNPs/CS-Res also presented high stability in suspension (up to 45 days) and still presented a consistent performance as a SERS substrate.</p> Graphical Abstract <p></p>

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Stability, Resuspensibility, and Evaluation as SERS Substrates of Gold Nanoparticle–Chitosan Nanocomposites

  • 期刊论文

  • 发表日期：

    2025年2月8日

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  • Hudson B. da Silva,
  • Linus Pauling de Faria Peixoto,
  • Gustavo F. S. Andrade

摘要

Gold nanoparticles (AuNPs) present unique physicochemical properties at the nanoscale, such as localized surface plasmon resonance. However, AuNPs synthesized by chemical reduction methods may easily aggregate or precipitate, affecting especially their plasmonic properties. Chitosan is a natural polysaccharide that is highly effective as a stabilizing agent for metallic nanoparticles. In the present study, a surface-enhanced Raman scattering (SERS) substrate was constructed using chitosan-capped AuNPs (AuNP/CS), with high stability in time (at least 45 days) in three exciting wavelengths, 633, 785, and 1064 nm. The AuNP/CS nanocomposite precipitated in high pH and was easily resuspended by acetic acid solution even after 30 days of storage, resulting in resuspended AuNP/CS (AuNP/CS-Res). The AuNPs/CS-Res nanocomposite presented negative charge selectivity for the SERS study of dyes. AuNPs/CS-Res also presented high stability in suspension (up to 45 days) and still presented a consistent performance as a SERS substrate.

Graphical Abstract