Liquid phase sensors based on chemically functionalized GaAs/AlGaAs heterostructures

S. M. Luber, K. Adlkofer, U. Rant, Abraham Ulman, A. Gölzhäuser, M. Grunze, D. Schuh, M. Tanaka, M. Tornow, G. Abstreiter

Research output: Contribution to journalArticle

Abstract

We report on surface-near two-dimensional electron gases in GaAs/AlGaAs heterostructures for application in potential chemical or biochemical sensors in liquid environment. GaAs cap layers of the heterostructures were coated with self-assembled monolayers of 4′-substituted 4-mercaptobiphenyls (MBP), showing stable device performance in physiological (aqueous) buffers. Deposition of MBP with different 4′-substituents led to systematic changes in the lateral resistance, which can be correlated to the electrical potential drop across the established surface dipole layers. Furthermore, the lateral resistance showed a clear dependency on organic solvents with different polarities, suggesting its high sensitivity to the polarity of physisorbed molecules.

Original languageEnglish (US)
Pages (from-to)1111-1115
Number of pages5
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume21
Issue number2-4
DOIs
StatePublished - Mar 2004

Fingerprint

aluminum gallium arsenides
Heterojunctions
polarity
liquid phases
Two dimensional electron gas
Chemical potential
sensors
Sensors
Liquids
Self assembled monolayers
caps
Organic solvents
electron gas
Buffers
buffers
dipoles
Molecules
sensitivity
liquids
molecules

Keywords

  • GaAs
  • Heterostructure
  • Self-assembled monolayer
  • Sensor
  • Two-dimensional electron gas

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Liquid phase sensors based on chemically functionalized GaAs/AlGaAs heterostructures. / Luber, S. M.; Adlkofer, K.; Rant, U.; Ulman, Abraham; Gölzhäuser, A.; Grunze, M.; Schuh, D.; Tanaka, M.; Tornow, M.; Abstreiter, G.

In: Physica E: Low-Dimensional Systems and Nanostructures, Vol. 21, No. 2-4, 03.2004, p. 1111-1115.

Research output: Contribution to journalArticle

Luber, SM, Adlkofer, K, Rant, U, Ulman, A, Gölzhäuser, A, Grunze, M, Schuh, D, Tanaka, M, Tornow, M & Abstreiter, G 2004, 'Liquid phase sensors based on chemically functionalized GaAs/AlGaAs heterostructures', Physica E: Low-Dimensional Systems and Nanostructures, vol. 21, no. 2-4, pp. 1111-1115. https://doi.org/10.1016/j.physe.2003.11.189
Luber, S. M. ; Adlkofer, K. ; Rant, U. ; Ulman, Abraham ; Gölzhäuser, A. ; Grunze, M. ; Schuh, D. ; Tanaka, M. ; Tornow, M. ; Abstreiter, G. / Liquid phase sensors based on chemically functionalized GaAs/AlGaAs heterostructures. In: Physica E: Low-Dimensional Systems and Nanostructures. 2004 ; Vol. 21, No. 2-4. pp. 1111-1115.
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AU - Gölzhäuser, A.

AU - Grunze, M.

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