Graphene veils: A versatile surface chemistry for sensors

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Developing universal surface chemistries for diverse sensor materials is challenging.
• Existing sensor surface modifications are often material-specific.
• A versatile, thin, and conformal film is needed for general sensor functionalization.

Purpose of the Study:

• To demonstrate graphene oxide (GO) films as a general surface chemistry for various sensor materials.
• To explore the functionalization and passivation capabilities of GO films.
• To validate GO films for biosensing applications.

Main Methods:

• Spin-coating of thin graphene oxide (GO) films (~4 nm) onto diverse sensor surfaces.
• Characterization of GO film properties and compatibility.
• Demonstration of covalent linkage of biomolecules via multiple pathways.
• Application of GO films on a magnetic sensor array for an immunoassay.
• Biosensing and material characterization of GO-veiled sensors.

Main Results:

• GO films (~4 nm) are successfully applied to a variety of sensor materials.
• GO films exhibit versatile covalent linkage capabilities for biomolecules.
• GO films support cell growth on sensor surfaces.
• A graphene veil atop a magnetic sensor array enabled a functional immunoassay.
• Comprehensive biosensing and material characterization data were obtained.

Conclusions:

• Graphene oxide (GO) films offer a broadly compatible and versatile surface chemistry for sensor technology.
• GO films facilitate optimized functionalization and passivation across different sensor materials.
• The developed GO films show significant promise for advanced biosensing and immunoassay applications.