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<p>Gold nanobipyramids (AuNBPs) possess sharp tips and highly tunable near-infrared localized surface plasmon resonance (LSPR) modes, making them attractive building blocks for plasmonic superstructures. However, achieving controllable and stable one-dimensional (1D) self-assembly in aqueous phase remains challenging. Here, we present an interface-mediated strategy in which CTAB regulates tip accessibility, while 4,4′-bipyridine (4,4′-BPy) participates in coordination-assisted interactions that modulate the assembly pathway and bias AuNBPs toward end-to-end configurations. Controlled CTAB desorption selectively exposes the {111} tip sites, enabling ligand-assisted interactions that favor anisotropic chain growth. Subsequent CTAB re-passivation enables kinetic stabilization of the assemblies, allowing chain elongation to be terminated at selected stages and yielding plasmonic nanochains with good long-term structural stability. Together, this synergistic combination of interfacial regulation, coordination-assisted interactions, and kinetic stabilization provides a versatile framework for constructing stable near-infrared plasmonic architectures and offers general design principles for manipulating collective optical modes in anisotropic nanostructure assemblies.</p>

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CTAB–4,4′-bipyridine interface-mediated self-assembly of gold nanobipyramids into stable plasmonic chains

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Lan Chen,
  • Xi-Hao Zhang,
  • Hironori Ito,
  • Tian-Song Deng

摘要

Gold nanobipyramids (AuNBPs) possess sharp tips and highly tunable near-infrared localized surface plasmon resonance (LSPR) modes, making them attractive building blocks for plasmonic superstructures. However, achieving controllable and stable one-dimensional (1D) self-assembly in aqueous phase remains challenging. Here, we present an interface-mediated strategy in which CTAB regulates tip accessibility, while 4,4′-bipyridine (4,4′-BPy) participates in coordination-assisted interactions that modulate the assembly pathway and bias AuNBPs toward end-to-end configurations. Controlled CTAB desorption selectively exposes the {111} tip sites, enabling ligand-assisted interactions that favor anisotropic chain growth. Subsequent CTAB re-passivation enables kinetic stabilization of the assemblies, allowing chain elongation to be terminated at selected stages and yielding plasmonic nanochains with good long-term structural stability. Together, this synergistic combination of interfacial regulation, coordination-assisted interactions, and kinetic stabilization provides a versatile framework for constructing stable near-infrared plasmonic architectures and offers general design principles for manipulating collective optical modes in anisotropic nanostructure assemblies.