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DNA immobilization onto electrochemically functionalized Si(100) surfaces.

A Shabani1, A W H Mak, I Gerges

  • 1Department of Chemistry and Biochemistry, Concordia University, 7141 Sherbrooke W., Montreal, Que., Canada H4B 1R6.

Talanta
|October 31, 2008
PubMed
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Researchers modified silicon surfaces with organic layers for DNA immobilization. Thicker, more uniform layers were achieved using acetonitrile, enabling successful DNA hybridization for biosensing applications.

Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • N-type silicon surfaces are crucial for electronic and biosensing applications.
  • Functionalization of silicon surfaces enables the immobilization of biomolecules.
  • Organic layer deposition methods are key to creating stable and uniform interfaces.

Purpose of the Study:

  • To modify N-type Si(100) surfaces with 4-nitrobenzenediazonium.
  • To characterize the resulting organic layers using Atomic Force Microscopy (AFM) and ellipsometry.
  • To evaluate the suitability of these functionalized surfaces for DNA immobilization and hybridization.

Main Methods:

  • Cyclic voltammetry was used to reduce 4-nitrobenzenediazonium on Si(100) surfaces.
  • Contact mode AFM was employed to measure layer thickness and assess uniformity.

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  • Ellipsometry confirmed the layer thicknesses.
  • DNA probe immobilization and hybridization were performed and validated using fluorescently labeled sequences.

    • Main Results:

    • Layer thickness increased with the number of cyclic potential scans, reaching approximately 35nm after three scans in acetonitrile.
    • Acetonitrile yielded more uniform layers compared to aqueous media.
    • Successful immobilization of DNA probes and hybridization with complementary sequences were demonstrated.

    Conclusions:

    • Multilayer organic films can be controllably formed on N-type Si(100) via electrochemical reduction.
    • Acetonitrile is a superior medium for depositing uniform, high-quality organic layers on silicon.
    • The functionalized silicon surfaces are suitable for specific DNA hybridization, indicating potential for biosensor development.