Abstract
The present work is motivated by attempts in our laboratory to develop the physical basis for the design of biosensors (suited for aqueous medium) based on biofunctional supported membranes. We studied the electrical properties of n-doped gallium arsenide (GaAs) in contact with electrolyte and the high insulating properties of self-assembled monolayers (SAMs) of octadecanethiol (C 18H 37SH) by impedance spectroscopy and cyclic voltammetry. The average thickness of the thiol monolayer was measured by ellipsometry and confirmed by impedance. The analysis of the impedance in terms of equivalent circuits of the GaAs/electrolyte and GaAs/insulator/electrolyte interface is discussed. This analysis allowed measurements of the defect area fraction of the thiol monolayer.
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