Microchimica Acta

, Volume 163, Issue 1–2, pp 49–56 | Cite as

Characterization of sub-systems of a molecular biowire-based biosensor device

  • Yang Liu
  • Amit Gore
  • Shantanu Chakrabartty
  • Evangelyn C. Alocilja
Original Paper


We describe the fabrication and characterization of components of a biosensor system that can be used for simultaneous screening of multiple pathogens in a sample. The two sub-systems are: (1) a mixed antibody immunosensor based on molecular biowires and (2) a multi-channel potentiostat for measuring conductance across the immunosensor. The immunosensor operates by converting binding events between antigen and antibody into a measurable electrical signal using polyaniline nanowires as labels and transducers. By mixing and patterning antibodies on a substrate, the response of the biosensor can detect the presence of either one of several pathogens present in the analyte through an equivalent change in conductance. The paper also presents a 42-channel potentiostat array which can be used for measuring the conductance change across the immunosensor. Each channel of the array uses a novel semi-synchronous ΣΔ modulator which enables detection down to femtoampere current ranges.

Keywords: Biosensor; polyaniline; nanowires; potentiostat 


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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Yang Liu
    • 1
  • Amit Gore
    • 1
  • Shantanu Chakrabartty
    • 1
  • Evangelyn C. Alocilja
    • 2
  1. 1.Department of Electrical and Computer EngineeringMichigan State UniversityEast LansingUSA
  2. 2.Department of Biosystems EngineeringMichigan State UniversityEast LansingUSA

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