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Preparation of Silicon Nanowire Field-effect Transistor for Chemical and Biosensing Applications
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Surface modifications of silicon nitride for cellular biosensor applications.

Johan Gustavsson1, George Altankov, Abdelhamid Errachid

  • 1Biomaterials, Biomechanics and Tissue Engineering Group, Department of Materials Science and Metallurgy, Universitat Politècnica de Catalunya, Avda. Diagonal 647, Barcelona 08028, Spain.

Journal of Materials Science. Materials in Medicine
|January 26, 2008
PubMed
Summary

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Silicon nitride (Si3N4) biosensors show poor cell adhesion. Modifying Si3N4 surfaces with amine (NH2) or carboxyl (COOH) groups improves cell interaction and osseointegration for biosensing applications.

Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Surface Chemistry

Background:

  • Silicon nitride (Si3N4) thin films are utilized in micro-biosensors for monitoring bone formation.
  • Si3N4 surfaces exhibit suboptimal osseointegration, leading to cell detachment at confluence.
  • Osteoblast-like cell behavior on Si3N4 requires investigation for improved biosensor functionality.

Purpose of the Study:

  • To enhance the osseointegration and cellular interaction of Si3N4 thin films for biosensor applications.
  • To evaluate the effects of surface modification with amine (NH2) and carboxyl (COOH) functional groups on cell behavior.
  • To understand the role of fibronectin (FN) adsorption and fate on modified Si3N4 surfaces.

Main Methods:

  • Surface modification of Si3N4 with self-assembled monolayers bearing NH2 and COOH end groups.

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  • Culturing osteoblast-like MG-63 cells on bare and modified Si3N4 surfaces.
  • Assessing cell adhesion, proliferation, differentiation, and fibronectin interactions.
  • Utilizing techniques to study fibronectin adsorption and cellular secretion.

    • Main Results:

    • Both NH2 and COOH modifications significantly improved confluent cell layer interaction and osseointegration.
    • NH2 functionalization enhanced fibronectin adsorption and cell proliferation but delayed differentiation.
    • Cellular fate of fibronectin was influenced by surface functionalities, impacting extracellular matrix development.
    • Si3N4 demonstrates good cellular biocompatibility but limited tissue integration, suitable for biosensors like ISFET.

    Conclusions:

    • Surface modification of Si3N4 with NH2 and COOH groups is crucial for improving interfacial tissue interaction in biosensors.
    • These modified surfaces are suitable substrates for monitoring cellular growth and matrix deposition via electrical impedance spectroscopy.
    • The findings support the use of functionalized Si3N4 in advanced cellular biosensor development for bone formation monitoring.