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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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Infrared Nanospectroscopy at the Graphene-Electrolyte Interface.

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|July 16, 2019
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Summary

We developed a new nanoscale method using Fourier transform infrared nanospectroscopy (nano-FTIR) to study graphene-liquid interfaces. This technique reveals molecular changes in electrolyte solutions with unprecedented spatial resolution.

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SNOMelectrical double layergraphenenano-FTIRnear-fieldsolid−liquid interface

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Electrochemistry

Background:

  • Understanding graphene-liquid interfaces is crucial for energy storage and electronics.
  • Current methods lack nanoscale resolution for interfacial molecular studies.

Purpose of the Study:

  • To introduce a novel nano-FTIR methodology for high-resolution graphene-liquid interface analysis.
  • To investigate molecular structure and ion behavior at biased graphene interfaces.

Main Methods:

  • Fourier transform infrared nanospectroscopy (nano-FTIR) with plasmonic enhancement near an atomic force microscope (AFM) tip.
  • Graphene acting as a sealed reservoir for liquid electrolytes and a working electrode.
  • Spectroscopic analysis of interfaces with water, propylene carbonate, and electrolyte solutions.

Main Results:

  • Achieved nanoscale spatial resolution for graphene-liquid interface studies.
  • Demonstrated ability to detect changes in ion concentration and speciation.
  • Compared nano-FTIR with attenuated total reflection spectroscopy, highlighting nano-FTIR's enhanced sensitivity.

Conclusions:

  • The developed nano-FTIR method provides unprecedented insight into graphene-liquid interfaces.
  • This technique is valuable for studying electric double layers and ion dynamics.
  • Enables bias-dependent investigations of interfacial molecular structures.