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Related Experiment Video

Updated: Jan 12, 2026

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

Published on: May 27, 2018

Probing aqueous interfaces with spin defects.

Alfonso Castillo¹, Gustavo R Pérez-Lemus^2,3, Mykyta Onizhuk²

¹Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA.

The Journal of Chemical Physics

|November 4, 2025

Summary

This summary is machine-generated.

Noise spectroscopy reveals how water and ions at interfaces affect quantum sensors. This method offers new insights into interfacial properties for diverse scientific applications.

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Area of Science:

Physical Chemistry
Materials Science
Quantum Sensing

Background:

Aqueous interfaces are crucial in many scientific fields, but their microscopic properties are challenging to measure.
Advanced spectroscopic techniques have improved, yet direct characterization of interfacial water dynamics remains difficult.

Purpose of the Study:

To explore noise spectroscopy for characterizing aqueous interfacial properties.
To investigate the impact of interfacial water and ions on quantum sensors hosted in 2D materials.

Main Methods:

Combined molecular dynamics simulations of water on a 2D substrate with calculations of spin defect dynamics.
Analyzed the influence of interfacial water and ions on the decoherence time of a model quantum sensor (spin defect).

Main Results:

Quantum sensor coherence time (Hahn echo) is sensitive to water's motional narrowing and hydrogen bonding.
Interfacial water dynamics and ion presence significantly affect sensor decoherence.
Results show sensitivity to temperature, water-surface interaction strength, and ion type (monovalent/divalent).

Conclusions:

Noise spectroscopy, using near-surface quantum sensors, provides a powerful tool to probe aqueous interface properties.
This approach offers broad applicability for understanding interfacial phenomena across various scientific disciplines.