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Highly sensitive polymer-based cantilever-sensors for DNA detection

  • Montserrat Calleja
  • Maria Tenje
  • M. Alvarez
  • J. Tamayo
Publiceringsår: 2005
Språk: Engelska
Sidor: 215-222
Publikation/Tidskrift/Serie: Ultramicroscopy
Volym: 105
Nummer: 1/4
Dokumenttyp: Artikel i tidskrift
Förlag: Elsevier


We present a technology for the fabrication of cantilever arrays aimed to develop an integrated biosensor microsystem. The fabrication process is based on spin coating of the photosensitive polymer and near-ultraviolet exposure. Arrays of up to 33 microcantilevers are fabricated in the novel polymer material SU-8. The low Young's modulus of the polymer, 40 times lower than that of silicon, enables to improve the sensitivity of the sensor device for target detection. The mechanical properties of SU-8 cantilevers, such as spring constant, resonant frequency and quality factor are characterized as a function of the dimensions and the medium. The devices have been tested for measurement of the adsorption of single stranded DNA and subsequent interstitial adsorption of lateral spacer molecules. We demonstrate that sensitivity is enhanced by a factor of six compared to that of commercial silicon nitride cantilevers.


  • Medical Engineering


  • ISSN: 0304-3991

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