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Area of Science:

  • Plasmonics
  • Nanotechnology
  • Spectroscopy

Background:

  • Liquid interfacial plasmonic platforms are emerging for sensors, catalysis, and tunable optical devices.
  • Surface-enhanced Raman spectroscopy (SERS) offers high sensitivity but often relies on solid substrates or nanoparticle sols, limiting practicality.
  • Developing a stable, quantitative liquid-state SERS platform is a significant challenge.

Purpose of the Study:

  • To develop a practical and quantitative liquid-state SERS platform.
  • To demonstrate the self-assembly of 3D plasmonic arrays at liquid interfaces.
  • To create a stable, reproducible SERS system using gold nanorods.

Main Methods:

  • Vigorous mixing of chloroform with citrate-capped gold nanorod sols.
  • Formation of 3D plasmonic arrays at the chloroform/water (O/W) interface.
  • Utilizing reversible O/W encasing in a cuvette based on surface wettability.
  • Employing a portable Raman device for SERS analysis.

Main Results:

  • Rapid self-assembly of 3D plasmonic arrays at the O/W interface, forming a self-healing, liquid-like golden droplet.
  • The O phase generated stable SERS fingerprints, serving as a homogeneous internal standard for quantitative analysis.
  • Both oil-in-water (O/W) and water-in-oil (W/O) platforms exhibited excellent SERS sensitivity and reproducibility for various analytes.

Conclusions:

  • The developed liquid interfacial plasmonic platform offers a promising alternative for practical SERS applications.
  • This system paves the way for a quantitative liquid-state SERS analyzer comparable to UV-Vis spectrometers.
  • The self-healing, reproducible nature of the platform surpasses limitations of traditional solid-state or sol-based SERS methods.