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Preparation of Silicon Nanowire Field-effect Transistor for Chemical and Biosensing Applications
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The label free DNA sensor using a silicon nanowire array.

Atul Kulkarni1, Yang Xu, Chisung Ahn

  • 1School of Mechanical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea.

Journal of Biotechnology
|May 15, 2012
PubMed
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Silicon nanowire (Si-NW) biosensors enable sensitive, label-free electrical detection of DNA. This study demonstrates Si-NW array devices for detecting 2D DNA lattices, paving the way for advanced diagnostics.

Area of Science:

  • Nanotechnology
  • Biotechnology
  • Electrical Engineering

Background:

  • Silicon nanowire (Si-NW) biosensors offer high sensitivity for label-free electrical detection of biomolecules.
  • Existing methods for DNA detection can be complex and require labeling.

Purpose of the Study:

  • To develop and evaluate silicon nanowire array electronic devices for sensitive and selective detection of 2D DNA lattices.
  • To demonstrate the feasibility of using these devices for label-free DNA sensing.

Main Methods:

  • Fabrication of a silicon nanowire array using a top-down approach, comprising 250 nanowires (20 μm length, 3.2 μm spacing).
  • Attachment of streptavidin (SA) to biotinylated DNA lattices.
  • Measurement and analysis of the photoresistivity changes in the Si-NW array device upon interaction with DNA lattices at varying concentrations.

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Main Results:

  • The conductivity of the DNA lattices with bound streptavidin (SA) induced a significant change in the photoresistivity of the Si-NW array device.
  • The Si-NW array demonstrated sensitive and selective detection capabilities for the DNA lattices.

Conclusions:

  • Silicon nanowire array devices are effective for direct, label-free DNA detection.
  • This technology presents a promising pathway for applications in immunological assays, DNA forensics, and toxin detection.