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Gallium nitride electrodes for membrane-based electrochemical biosensors

  • T. Schubert
  • G. Steinhoff
  • H. -G. von Ribbeck
  • M. Stutzmannn
  • M. Eickhoff
  • M. TanakaEmail author
Regular Article

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.

PACS

84.37.+q Measurements in electric variables (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.) 87.14.Cc Lipids 87.85.fk Biosensors 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • T. Schubert
    • 1
  • G. Steinhoff
    • 2
  • H. -G. von Ribbeck
    • 2
  • M. Stutzmannn
    • 2
  • M. Eickhoff
    • 3
  • M. Tanaka
    • 1
    Email author
  1. 1.Institut für Physikalische ChemieUniversität HeidelbergHeidelbergGermany
  2. 2.Walter Schottky InstitutTechnische Universität MünchenGarchingGermany
  3. 3.I. Physikalisches InstitutJustus-Liebig-Universität GiessenGiessenGermany

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