Help Privacy Policy Disclaimer
  Advanced SearchBrowse




Journal Article

Liquid phase sensors based on chemically functionalized GaAs/AlGaAs heterostructures


Grunze,  Michael
Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society;

Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available

Luber, S., Adlkofer, K., Rant, U., Ulman, A., Gölzhäuser, A., Grunze, M., et al. (2004). Liquid phase sensors based on chemically functionalized GaAs/AlGaAs heterostructures. Physica E: Low-Dimensional Systems And Nanostructures, 21(2-4), 1111-1115. doi:10.1016/j.physe.2003.11.189.

Cite as: https://hdl.handle.net/21.11116/0000-0001-ADAC-B
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.