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Related Experiment Video

Updated: Jul 9, 2025

Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics
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Plasmonic Multi-Layered Built-in Hotspots Nanogaps for Effectively Activating Analytes.

Lei Jiang1, Xiaoyuan Wang1, Jingyi Zhou1

  • 1College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, Zhejiang, 311121, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|December 3, 2023
PubMed
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Researchers developed multi-layered plasmonic nanostructures (multi-Au@Ag-Au NPs) for enhanced analyte detection. These novel nanoparticles exhibit strong electromagnetic field confinement and high sensitivity, advancing Surface-Enhanced Raman Spectroscopy (SERS) applications.

Area of Science:

  • Plasmonics
  • Nanotechnology
  • Surface Chemistry

Background:

  • Multi-layered plasmonic nanostructures are crucial for near-field confinement and analyte activation.
  • Achieving high performance in these nanostructures presents significant challenges.

Purpose of the Study:

  • To develop semi-open Au core@carved AuAg multi-shell superstructure nanoparticles (multi-Au@Ag-Au NPs) with tunable electromagnetic fields and analyte-capturing capabilities.
  • To investigate the plasmonic properties and sensing performance of these novel nanostructures.

Main Methods:

  • Synthesis of multi-Au@Ag-Au NPs with varying layer numbers (mono to penta) through controlled galvanic exchange and silver growth.
  • Characterization of nanoparticle structure, including asymmetric nanoholes and internal nanogaps.
Keywords:
activating analytesbuilt-in nanogapsmulti-layered nanostructuresnear-filed enhancementsurface-enhanced Raman spectroscopy

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  • Evaluation of electromagnetic field enhancement and light-harvesting capabilities.
  • Assessment of sensing performance using Surface-Enhanced Raman Spectroscopy (SERS).

    • Main Results:

    • Successfully synthesized multi-Au@Ag-Au NPs with tunable layer numbers and asymmetric nanoholes.
    • Achieved significant electromagnetic field enhancement (up to 48841 for penta-Au@Ag-Au NPs) due to collective plasmon oscillations.
    • Demonstrated remarkable, laser-adaptive light-harvesting capability for high-diversity detection.
    • Attained highly sensitive detection with a limit of detection as low as 3.22 × 10-12 M due to structural specificity and interior hotspots.

    Conclusions:

    • The study presents a novel pathway for creating plasmonic superstructures with integrated hotspots for effective analyte activation.
    • The developed multi-Au@Ag-Au NPs offer a promising platform for highly sensitive and diverse SERS detection.
    • This work stimulates advancements in SERS substrates for a wide range of applications.