Bio-Separated and Gate-Free 2D MoS₂ Biosensor Array for Ultrasensitive Detection of BRCA1

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Two-dimensional molybdenum disulfide (MoS2) thin film transistors are crucial for biosensing applications.
• Existing MoS2 biosensors face challenges in device reusability and stability in biological solutions.
• Improving detection limits and linear ranges are key goals in MoS2 biosensor development.

Purpose of the Study:

• To develop a reusable and biocompatible MoS2-based biosensor with enhanced stability in biological solutions.
• To address signal interference and solution erosion issues in semiconductor-based biosensors.
• To achieve ultrasensitive and broad-range detection of DNA biomarkers.

Main Methods:

• Synthesized an array of MoS2 using patterned chemical vapor deposition.
• Developed a one-step biomodification technique using DNA tetrahedron probes for a bio-separated sensing pad.
• Implemented a gate-free detection structure for DNA detection.

Main Results:

• Demonstrated a bio-separated sensing part, preventing signal interference and solution erosion.
• Achieved physical device reusability after exposure to biological solutions.
• Showcased ultrasensitive detection of BRCA1 DNA from 1 fM to 1 μM with R² = 0.98.

Conclusions:

• The developed MoS2 biosensor offers a practical solution for high-performance, low-cost, and reusable biosensing platforms.
• The bio-separated design enhances the stability and compatibility of semiconductor biosensors with biological environments.
• This work paves the way for advanced, reliable, and reusable biosensor technologies.