Three-dimensional interdigitated electrode array as a transducer for label-free biosensors

Andrey Bratov, Javier Ramón-Azcón, Natalia Abramova, Angel Merlos, Javier Adrian, Francisco Sánchez-Baeza, Maria Pilar Marco, Carlos Domínguez

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)


A new transducer for biosensor applications has been developed based on a three-dimensional interdigitated electrode array (IDEA) with electrode digits separated by an insulating barrier. Binding of molecules to a chemically modified surface of the transducer induces important changes in conductivity between the electrodes. Three-dimensional sensor shows considerable improvement compared with a standard planar IDEA design. The potential of the developed device as a sensor transducer to detect immunochemical and enzymatic reactions, as well as DNA hybridization events is demonstrated. The immunosensor allows direct detection of the antibiotic sulfapyridine and shows the IC50 parameter value of 5.6 μg L-1 in a buffer. Immunochemical determination occurs under competitive configurations and without the use of any label. Each modified sensor is of a single use. Nevertheless, biochemical reagents can be easily cleaned off the sensor surface for its reuse. Layer-by-layer method of used to deposit polyethyleneimine and glucose oxidase showed that the sensor is also highly effective for detecting single and multilayered molecular assemblies.

Original languageEnglish
Pages (from-to)729-735
Number of pages7
JournalBiosensors and Bioelectronics
Issue number4
Publication statusPublished - 2008 Dec 1
Externally publishedYes


  • Biosensor
  • DNA hybridization
  • Glucose oxidase
  • Immunosensor
  • Impedance
  • Interdigitated electrode array

ASJC Scopus subject areas

  • Biotechnology
  • Biophysics
  • Biomedical Engineering
  • Electrochemistry


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