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Versatile Side-Illumination Geometry for Tip-Enhanced Raman Spectroscopy at Solid/Liquid Interfaces.

Natalia Martín Sabanés1, Leonie M A Driessen1, Katrin F Domke1

  • 1Max Planck Institute for Polymer Research , Ackermannweg 10, 55128 Mainz, Germany.

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This study presents a new side-illumination tip-enhanced Raman spectroscopy (TERS) setup for solid/liquid interfaces. The cost-efficient design enables high-sensitivity chemical and topographic surface characterization in aqueous environments.

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Area of Science:

  • Surface science
  • Spectroscopy
  • Nanotechnology

Background:

  • Tip-enhanced Raman spectroscopy (TERS) offers high spatial resolution and sensitivity for surface characterization.
  • Adapting TERS for solid/liquid interfaces is crucial for studying complex systems like biological membranes and energy devices.

Purpose of the Study:

  • To develop a versatile and cost-efficient home-built side-illumination TERS setup for solid/liquid interfaces.
  • To demonstrate the feasibility and sensitivity of TERS in aqueous environments.

Main Methods:

  • A side-illumination TERS setup was designed and constructed using a commercial scanning tunneling microscope (STM).
  • The setup was tested using resonant dye and nonresonant thiophenol monolayers on Au single crystals in an aqueous phase.
  • STM parameters were investigated for their influence on TERS sensitivity.

Main Results:

  • The developed TERS setup successfully characterized molecular monolayers at solid/liquid interfaces.
  • Excitation beam aberrations in the aqueous phase were found to be negligible for TERS signal detection.
  • High Raman enhancement factors (10^5) were achieved at low laser power (μW).

Conclusions:

  • The home-built side-illumination TERS system provides a viable and cost-efficient solution for in situ characterization of solid/liquid interfaces.
  • The STM plays a critical role in achieving high sensitivity for solid/liquid TERS.
  • This configuration holds significant potential for advancing interfacial spectroscopic studies in aqueous media.