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    Area of Science:

    • Nanotechnology
    • Materials Science
    • Biophysics

    Background:

    • Plasmonic properties of silver nanoparticle (AgNP) arrays depend on size, shape, and arrangement.
    • Chiral self-assembly of peptide amphiphiles (APs) offers precise control over nanomaterial architecture.

    Purpose of the Study:

    • To develop a strategy for creating chiral AgNP arrays using constitutionally isomeric APAs.
    • To investigate how subtle molecular structure differences in APAs influence the plasmonic properties of AgNP/APA hybrids.
    • To evaluate the performance of these hybrid materials as surface-enhanced Raman spectroscopy (SERS) substrates.

    Main Methods:

    • Self-assembly of two isomeric APAs (KSEK and EKSK) into nanostructures in the presence of silver ions and poly(sodium 4-styrenesulfonate) (PSSS).
    • Templated synthesis of approximately 8 nm AgNP arrays on the assembled nanostructures.
    • Characterization of plasmonic properties and colloidal stability of the AgNP/APA hybrids.
    • Assessment of SERS performance using model analytes.

    Main Results:

    • One APA (KSEK) formed chiral nanohelices, while the isomer (EKSK) formed nanoribbons.
    • Both AgNP/APA hybrids demonstrated enhanced colloidal stability compared to pure AgNPs.
    • Nanohelical AgNP arrays exhibited superior SERS sensitivity compared to nanoribbon counterparts and pure AgNPs.

    Conclusions:

    • Molecular structure of APAs dictates the self-assembled nanostructure (nanohelices vs. nanoribbons).
    • Chiral AgNP nanohelices serve as highly effective SERS substrates with improved stability and sensitivity.
    • This work highlights the potential of structurally controlled peptide amphiphiles for advanced plasmonic nanomaterials.