PH sensitivity of gallium arsenide (GaAs) electrodes functionalized with methyl-mercaptobiphenyl monolayers

Daniel Gassull, Sebastian M. Luber, Abraham Ulman, Michael Grunze, Marc Tornow, Gerhard Abstreiter, Motomu Tanaka

Research output: Contribution to journalArticle

Abstract

GaAs electrodes coated with hydrophobic, methyl-mercaptobiphenyl (CH 3-MBP) monolayers exhibited an excellent electrochemical stability. We found that the interface resistance of the chemically functionalized GaAs shows linear relationships with electrolyte pH and bias potential in a reproducible manner. The impedance spectra measured in a wide frequency range (f = 100 kHz to 50 mHz) are analyzed with several equivalent circuit models in a quantitative manner, and the pH sensitivity extrapolated from two linear relationships (35 mV pH-1) can be attributed to the absorption of the OH- ions on the hydrophobic surface.

Original languageEnglish (US)
Pages (from-to)12414-12419
Number of pages6
JournalJournal of Physical Chemistry C
Volume111
Issue number33
DOIs
StatePublished - Aug 23 2007

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Gallium arsenide
gallium
Monolayers
Electrodes
electrodes
sensitivity
Equivalent circuits
Electrolytes
Ions
equivalent circuits
frequency ranges
electrolytes
impedance
methylidyne
gallium arsenide
ions
hydroxide ion

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

PH sensitivity of gallium arsenide (GaAs) electrodes functionalized with methyl-mercaptobiphenyl monolayers. / Gassull, Daniel; Luber, Sebastian M.; Ulman, Abraham; Grunze, Michael; Tornow, Marc; Abstreiter, Gerhard; Tanaka, Motomu.

In: Journal of Physical Chemistry C, Vol. 111, No. 33, 23.08.2007, p. 12414-12419.

Research output: Contribution to journalArticle

Gassull, Daniel ; Luber, Sebastian M. ; Ulman, Abraham ; Grunze, Michael ; Tornow, Marc ; Abstreiter, Gerhard ; Tanaka, Motomu. / PH sensitivity of gallium arsenide (GaAs) electrodes functionalized with methyl-mercaptobiphenyl monolayers. In: Journal of Physical Chemistry C. 2007 ; Vol. 111, No. 33. pp. 12414-12419.
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