Liquid phase sensors based on chemically functionalized GaAs/AlGaAs 
heterostructures

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

doi:10.1016/j.physe.2003.11.189

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Liquid phase sensors based on chemically functionalized GaAs/AlGaAs heterostructures

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

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https://www.sciencedirect.com/science/article/pii/S1386947703007665/pdfft?md5=2baa89cd282fffb45641d8372a08fe7a&pid=1-s2.0-S1386947703007665-main.pdf
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https://doi.org/10.1016/j.physe.2003.11.189
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Citation

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

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.