The aim of the work is the electrochemical characterization of GaAs surfaces functionalized with bioorganic molecules towards chemical/biochemical sensor applications. Due to an excellent electrochemical stability achieved by deposition of biphenylthiol monolayers, GaAs electrodes can be subjected to electrochemical impedance spectroscopy to identify different electrochemical layers quantitatively. The interface resistance of functionalized bulk GaAs shows distinct pH sensitivity, influenced by the type of electrolyte counter anion, which is comparable to that obtained by two-dimensional electron gas devices. As the first step of biofunctionalization, lipid monolayers are deposited on GaAs pre-coated with thiol monolayers. GaAs coated with a highly insulating lipid membrane is electrochemical stable for more than several days, exhibiting a high sensitivity to membrane surface potentials and enzymatic reaction.    «

The aim of the work is the electrochemical characterization of GaAs surfaces functionalized with bioorganic molecules towards chemical/biochemical sensor applications. Due to an excellent electrochemical stability achieved by deposition of biphenylthiol monolayers, GaAs electrodes can be subjected to electrochemical impedance spectroscopy to identify different electrochemical layers quantitatively. The interface resistance of functionalized bulk GaAs shows distinct pH sensitivity, influenced by...    »