Free energy relationships in the electrical double layer over single-layer graphene

Jennifer L. Achtyl, Ivan V. Vlassiouk, Pasquale F. Fulvio, Shannon M. Mahurin, Sheng Dai, Franz M Geiger*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Fluid/solid interfaces containing single-layer graphene are important in the areas of chemistry, physics, biology, and materials science, yet this environment is difficult to access with experimental methods, especially under flow conditions and in a label-free manner. Herein, we demonstrate the use of second harmonic generation to quantify the interfacial free energy at the fused silica/single-layer graphene/water interface at pH 7 and under conditions of flowing aqueous electrolyte solutions ranging in NaCl concentrations from 10-4 to 10-1 M. Our analysis reveals that single-layer graphene reduces the interfacial free energy density of the fused silica/water interface by a factor of up to 7, which is substantial given that many interfacial processes, including those that are electrochemical in nature, are exponentially sensitive to interfacial free energy density.

Original languageEnglish (US)
Pages (from-to)979-981
Number of pages3
JournalJournal of the American Chemical Society
Volume135
Issue number3
DOIs
StatePublished - Jan 23 2013

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

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