Ferroelectric Bi₂O₂Te-Based Plasmonic Biosensor for Ultrasensitive Biomolecular Detection

Area of Science:

• Materials Science
• Biotechnology
• Nanotechnology

Background:

• Ultrasensitive detection of biomarkers like proteins and microRNA is crucial for early disease diagnosis.
• Conventional surface plasmon resonance biosensors struggle with detecting low-concentration biomolecules due to minimal mass or refractive index changes.
• The need for enhanced sensitivity in biosensing platforms is a significant challenge in diagnostics.

Purpose of the Study:

• To develop an ultrasensitive plasmonic biosensor strategy utilizing the ferroelectric properties of Bismuth Oxy-telluride (Bi2O2Te).
• To demonstrate the capability of this novel biosensor for detecting charged biomolecules, including proteins and microRNA, at ultralow concentrations.
• To explore the integration of 2D ferroelectric materials into plasmonic biosensing for advanced diagnostic applications.

Main Methods:

• Utilized the ferroelectric properties of Bismuth Oxy-telluride (Bi2O2Te) as the sensitive layer in a plasmonic biosensor.
• Leveraged polarization alteration in Bi2O2Te to generate a significant plasmonic biosensing response.
• Quantified the detection limits for protein and microRNA molecules using the developed biosensor.

Main Results:

• Achieved an extraordinary ultralow detection limit of 1 femtomolar (fm) for protein molecules.
• Demonstrated an unprecedented detection limit of 0.1 femtomolar (fm) for microRNA molecules.
• Showcased exceptional specificity in detecting these ultralow concentrations of biomarkers.

Conclusions:

• The ferroelectric properties of Bi2O2Te enable ultrasensitive detection of charged biomolecules.
• This novel plasmonic biosensor strategy offers a promising platform for early disease diagnosis.
• The integration of 2D ferroelectric materials into plasmonic biosensors opens new avenues for advanced biomedical applications.