Sum frequency generation study on the molecular structures at the interfaces between quartz modified with amino-terminated self-assembled monolayer and electrolyte solutions of various pH and ionic strengths

T. Pajkossy, D. M. Kolb

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Abstract

The structures of water at the interfaces between a fused quartz surface modified by a self-assembled monolayer (SAM) of an amino-terminated silane molecule and electrolyte solutions of various pH and ionic strengths were investigated using sum frequency generation (SFG) vibrational spectroscopy. The structure of the interfacial water strongly depended on the pH of the solution. The effect of the electric double layer generated by the protonation of the amino groups in the SAM and unreacted silanol groups on the quartz substrate at low and high pH, respectively, is considered to be responsible for the pH-dependent SFG behavior.

Original languageEnglish
Pages (from-to)3057-3061
Number of pages5
JournalElectrochimica Acta
Volume46
Issue number20-21
DOIs
Publication statusPublished - Jul 30 2001

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Keywords

  • Interfacial molecular structure
  • Self-assembled monolayer (SAM)
  • Solid-liquid interface
  • Sum frequency generation (SFG)
  • Water structure

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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