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Langmuir 2006, 22, 7156-7158
Bias-Dependent Admittance in Hybrid Bilayer Membranes Vesselin Nikolov, Aleksandar Radisic, Kalina Hristova,* and Peter C. Searson* Department of Materials Science and Engineering, and Institute of NanoBioTechnology, Johns Hopkins UniVersity, Baltimore, Maryland 21218 ReceiVed May 31, 2006 Artificial bilayer membranes provide a platform for bioelectronic devices based on their structural, sensing, and transport functions. In this letter, we report on the impedance response of an engineered membrane with a lower leaflet of octadecanethiol on gold and an outer leaflet of dioleoylphosphatidylcholine with the monomeric channel protein gramicidin. This hybrid bilayer exhibits an electrical response analogous to a solid-state diode: the admittance is very low (
