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Published on: July 8, 2025
Molybdenum disulfide-based amplified fluorescence DNA detection using hybridization chain reactions
Jiahao Huang1, Lei Ye, Xiang Gao
1Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China. mezli@ust.hk.
We developed a new DNA detection method using molybdenum disulfide (MoS2) nanosheets and hybridization chain reactions (HCRs). This sensitive and selective biosensor offers a simple "mix-and-detect" approach for versatile applications.
Area of Science:
- Nanomaterials Science
- Biotechnology
- Analytical Chemistry
Background:
- Molybdenum disulfide (MoS2) is an emerging nanomaterial with notable fluorescence quenching and DNA adsorption properties.
- Existing biosensors face challenges in sensitivity, selectivity, and operational simplicity for DNA detection.
Purpose of the Study:
- To develop a novel MoS2-based fluorescent biosensor for sensitive and selective DNA detection.
- To leverage hybridization chain reactions (HCRs) for signal amplification in the biosensing system.
Main Methods:
- Utilized MoS2 nanosheets to suppress background fluorescence and modulate signal emission.
- Employed target-DNA-triggered HCRs between hairpin probes for signal amplification.
- Implemented a simple "mix-and-detect" procedure in solution.
Main Results:
- Achieved a highly sensitive DNA detection limit of 15 pM.
- Demonstrated excellent selectivity against mismatched DNA sequences.
- The MoS2-based biosensor exhibited high sensitivity, selectivity, and operational simplicity.
Conclusions:
- MoS2 is a promising nanomaterial for developing versatile and high-performance biosensors.
- The integration of MoS2 with HCRs offers a robust strategy for sensitive DNA detection.
- The developed biosensor presents a user-friendly platform for various diagnostic applications.
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