Gallium nitride electrodes for membrane-based electrochemical biosensors |
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| Authors: | T Schubert G Steinhoff H -G von Ribbeck M Stutzmannn M Eickhoff and M Tanaka |
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| Institution: | (1) Department of Chemistry: Biophysical Chemistry, Umeå University, 901 87 Umeå, Sweden;(2) Centre for Biomedical Engineering and Physics, Umeå University, 901 87 Umeå, Sweden;(3) Department of Chemistry: Analytical Chemistry, Umeå University, 901 87 Umeå, Sweden;(4) Centre for Biomedical Engineering and Physics, Umeå University, 901 87 Umeå, Sweden;(5) The Unit of Biomass Technology and Chemistry, SLU Röbäcksdalen, P.O. Box 4097, 904 03 Umeå, Sweden;(6) Department of Biochemistry and Chemistry, University of Arkansas, Fatteyville, AR 72701, USA;(7) Centre for Self Organising Molecular Systems, University of Leeds, Leeds, LS2 9JT, UK |
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| Abstract: | We report on the deposition of planar lipid bilayers (supported membranes) on gallium nitride (GaN) electrodes for potential
applications as membrane-based biosensors. The kinetics of the lipid membrane formation upon vesicle fusion were monitored
by simultaneous measurements of resistance and capacitance of the membrane using AC impedance spectroscopy in the frequency
range between 50mHz and 50kHz. We could identify a two-step process of membrane spreading and self-healing. Despite its relatively
low resistance, the membrane can be modeled by a parallel combination of an ideal resistor and capacitor, indicating that
the membrane efficiently blocks the diffusion of ions. |
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