Amorphous/nanocrystalline silicon pi'ii'n devices fabricated on micromachined glass substrates are integrated with oligonucleotide-derivatized gold nanoparticles for a colorimetric detection method. The method enables the specific detection and quantification of unamplified nucleic acid sequences (DNA and RNA) without the need to functionalize the glass surface, allowing for resolution of single nucleotide differences between DNA and RNA sequences-single nucleotide polymorphism and mutation detection. The detector's substrate is glass and the sample is directly applied on the back side of the biosensor, ensuring a direct optical coupling of the assays with a concomitant maximum photon capture and the possibility to reuse the sensor. (c) 2007 American Institute of Physics.
Original languageEnglish
Article number023903
Pages (from-to)n/d
JournalApplied Physics Letters
Issue number2
Publication statusPublished - 1 Jan 2007


  • Bioassay
  • Biosensors
  • Colorimetry
  • DNA sequences
  • Gold
  • Mutagenesis
  • Nanostructured materials
  • Optical properties
  • Photons


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