A suspended graphene-based optical interferometric surface stress sensor for selective biomolecular detection

Area of Science:

• Materials Science
• Nanotechnology
• Biosensing

Background:

• Graphene's unique properties, including high surface area and electron mobility, make it ideal for advanced sensor applications.
• Developing selective and robust biosensors is crucial for accurate molecular detection.

Purpose of the Study:

• To demonstrate selective molecular detection using antigen-antibody reactions on suspended graphene with a cavity-sealing structure.
• To enhance the robustness and functionalization capabilities of graphene-based sensors for biosensing applications.

Main Methods:

• Utilizing suspended graphene sealed in nanocavities on a silicon substrate.
• Employing wet chemical processes for surface functionalization to achieve selective molecular binding.
• Evaluating selectivity through nanomechanical deflection and optical interference spectral shifts upon molecular adsorption.

Main Results:

• Demonstrated selective molecular binding via antigen-antibody reactions on functionalized suspended graphene.
• Observed spectral shifts in optical interference correlating with molecular adsorption, indicating nanomechanical deflection.
• Showcased the potential for colorimetric analysis of molecular interactions and kinetics.

Conclusions:

• The cavity-sealing structure enhances the robustness of suspended graphene sensors.
• Chemically functionalized suspended graphene enables selective molecular detection and analysis of molecular interactions.
• This approach provides a sensitive platform for biosensing applications using optical interference.