Atomic-Level Defect Engineering in GeP Nanoflake Biosensors for Gastric Cancer Diagnosis

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Defect engineering enhances biosensor sensitivity by creating active sites.
• Precise control over defects in materials remains a challenge.
• Two-dimensional (2D) layered materials offer unique properties for advanced applications.

Purpose of the Study:

• To develop an ultrasensitive biosensor using atomic-level defect engineering in 2D Germanium Phosphide (GeP) materials.
• To precisely anchor gold nanoparticles (Au NPs) onto defect sites for enhanced detection.
• To demonstrate the biosensor's efficacy in detecting microRNA biomarkers for gastric cancer.

Main Methods:

• Atomic-level defect engineering of GeP 2D materials.
• In situ growth of Au nanoparticles on single defect active sites.
• Fabrication of a GeP-based biosensor for microRNA detection.
• Validation using clinical tissue samples from gastric cancer patients.

Main Results:

• The GeP-based biosensor achieved an ultra-low detection limit of 28.6 aM for miRNA.
• Demonstrated excellent chemical stability, sensitivity, and selectivity.
• Successfully quantified the miR378c biomarker in clinical gastric cancer samples.
• Enabled accurate, stage-specific monitoring of the disease.

Conclusions:

• Atomic-level defect engineering in GeP 2D materials is a viable strategy for creating highly sensitive biosensors.
• The developed biosensor shows significant potential for early cancer diagnosis, staging, and monitoring.
• This work advances biosensing materials and offers a promising tool for clinical applications.