A Sensitivity-Enhanced Electrolyte-Gated Graphene Field-Effect Transistor Biosensor by Acoustic Tweezers

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Biosensing

Background:

• Accurate detection of low-abundance biomolecules is critical for diagnostics.
• Existing biosensors often face limitations in sensitivity and detection speed.

Purpose of the Study:

• To develop a highly sensitive electrolyte-gated graphene field-effect transistor (EGFET) biosensor.
• To integrate acoustic tweezers for biomolecule pre-concentration and enhanced detection.

Main Methods:

• Fabrication of an EGFET biosensor.
• Utilizing high-frequency bulk acoustic resonators (acoustic tweezers) for nanoparticle and biomolecule concentration.
• Experimental analysis and verification of acoustic tweezers' concentration principle.
• Comparison of EGFET sensitivity with and without acoustic tweezers pre-concentration.

Main Results:

• Acoustic tweezers effectively concentrated IgG molecules onto the graphene surface within 10 minutes.
• The sensitivity of the EGFET biosensor was significantly increased by using surface mode resonators (SMR) as a biomolecule concentrator.
• Demonstrated remarkable enhancement in biosensor sensitivity.

Conclusions:

• The developed EGFET biosensor integrated with acoustic tweezers offers a substantial improvement in sensitivity for low-abundance biomolecule detection.
• The device's advantages include miniaturization, low reagent consumption, high sensitivity, and rapid detection.
• Potential for broad application in biological and medical fields.