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Updated: Aug 30, 2025

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy
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The dielectric function profile across the water interface through surface-specific vibrational spectroscopy and

Kuo-Yang Chiang1, Takakazu Seki1, Chun-Chieh Yu1

  • 1Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, 55128 Mainz, Germany.

Proceedings of the National Academy of Sciences of the United States of America
|August 29, 2022
PubMed
Summary

Interfacial water dielectric properties, crucial for reactions and transport, were studied using sum-frequency generation (SFG) spectra. Findings reveal a drastic dielectric constant change within 1 Å of the interface, forming an electric triple layer.

Keywords:
dielectric functioninterfacial watermolecular dynamics simulationvibrational spectroscopy

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Spectroscopy

Background:

  • Dielectric properties of interfacial water are critical for various interfacial phenomena, including chemical reactions, carrier transfer, and ion transport.
  • Understanding these properties at subnanometer scales is challenging due to limitations in experimental resolution.
  • The precise nature of the interfacial dielectric function remains a subject of ongoing scientific debate.

Purpose of the Study:

  • To investigate the subnanometer dielectric properties of interfacial water.
  • To resolve the depth-dependent dielectric function of water at interfaces.
  • To explore the implications of interfacial dielectric gradients on electrical double-layer models.

Main Methods:

  • Utilized surface-specific sum-frequency generation (SFG) spectroscopy to probe interfacial water molecules.
  • Achieved subnanometer depth resolution by analyzing the vibrational response of water at different depths.
  • Combined experimental SFG spectra with theoretical simulations for the air/water interface.

Main Results:

  • Demonstrated that SFG spectral amplitudes directly report on the local interfacial dielectric environment.
  • Observed a drastic change in the interfacial dielectric constant within an approximately 1 Å thin region at the air/water interface.
  • Identified a strong dielectric constant gradient across the interfacial water layer.

Conclusions:

  • The study provides unprecedented subnanometer resolution of interfacial water dielectric properties.
  • The findings challenge existing models by revealing a significant dielectric gradient at interfaces.
  • This gradient leads to the formation of an electric triple layer at charged planar interfaces, extending the conventional double-layer theory.