Label free DNA detection using large area graphene based field effect transistor biosensors

Area of Science:

• Materials Science
• Nanotechnology
• Biotechnology

Background:

• Graphene field-effect transistors (FETs) offer promising platforms for biosensing due to their unique electronic properties.
• Label-free detection methods are highly desirable for simplifying biosensing protocols and reducing costs.
• Developing cost-effective and highly sensitive biosensors for Deoxyribonucleic acid (DNA) detection is crucial for diagnostics.

Purpose of the Study:

• To fabricate highly sensitive graphene-based FET biosensors using a cost-effective approach.
• To demonstrate the application of these biosensors for label-free DNA detection.
• To achieve a low detection limit for DNA using the developed FET biosensor.

Main Methods:

• Utilizing Chemical Vapor Deposition (CVD) grown graphene layers for mass production of FET devices.
• Employing conventional photolithographic patterning for device fabrication.
• Performing non-covalent functionalization of the graphene layer with 1-Pyrenebutanoic acid succinimidyl ester to enhance conductivity and sensitivity.

Main Results:

• Successful fabrication of graphene-based FET biosensors with high sensitivity.
• Demonstration of label-free DNA detection capabilities.
• Achieving a low detection limit as low as 3 x 10(-9) M for DNA detection.

Conclusions:

• The developed graphene FET biosensor offers a cost-effective and highly sensitive platform for label-free DNA detection.
• Non-covalent functionalization is an effective strategy to improve the performance of graphene FET biosensors.
• The low detection limit achieved highlights the potential of this technology for sensitive biological analysis and diagnostics.