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

doi:10.1021/jp072952y

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

Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article › peer-review

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 language	English (US)
Pages (from-to)	12414-12419
Number of pages	6
Journal	Journal of Physical Chemistry C
Volume	111
Issue number	33
DOIs	https://doi.org/10.1021/jp072952y
State	Published - Aug 23 2007

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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title = "PH sensitivity of gallium arsenide (GaAs) electrodes functionalized with methyl-mercaptobiphenyl monolayers",

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.",

author = "Daniel Gassull and Luber, {Sebastian M.} and Abraham Ulman and Michael Grunze and Marc Tornow and Gerhard Abstreiter and Motomu Tanaka",

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T1 - PH sensitivity of gallium arsenide (GaAs) electrodes functionalized with methyl-mercaptobiphenyl monolayers

AU - Gassull, Daniel

AU - Luber, Sebastian M.

AU - Ulman, Abraham

AU - Grunze, Michael

AU - Tornow, Marc

AU - Abstreiter, Gerhard

AU - Tanaka, Motomu

PY - 2007/8/23

Y1 - 2007/8/23

N2 - 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.

AB - 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.

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JF - Journal of Physical Chemistry C

IS - 33

ER -

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

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