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Ultrasensitive and Regenerative Transistor Sensor Based on Dynamic Covalent Chemistry
Ban-Peng Cao1,2, Changhao Dai2, Xuejun Wang2
1Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, China.
Sensors (Basel, Switzerland)
|September 23, 2022
Summary
We developed a graphene field-effect transistor (FET) sensor with a regenerative interface. This novel sensor achieves ultra-high sensitivity and regeneration, significantly advancing FET sensor technology for various applications.
Area of Science:
- Materials Science
- Nanotechnology
- Sensor Technology
Background:
- Field-effect transistor (FET) sensors need high sensitivity and regeneration for practical use.
- Existing regenerative FETs have limited detection capabilities, with lowest limits of detection (LoD) around 10-15 mol L-1.
Purpose of the Study:
- To develop a graphene FET sensor with an enhanced regenerative sensing interface.
- To achieve a significantly lower limit of detection (LoD) compared to existing transistor sensors.
Main Methods:
- Fabrication of a graphene FET sensor utilizing a regenerative interface based on dynamic covalent chemistry (DCvC).
- Evaluation of sensor performance, focusing on sensitivity, limit of detection (LoD), and regeneration capability over multiple cycles.
Main Results:
- Achieved an ultra-low limit of detection (LoD) down to 5.0 × 10-20 mol L-1.
- Maintained this ultra-high sensitivity even after 10 regenerative cycles.
- Demonstrated LoD approximately 4-5 orders of magnitude lower than current transistor sensors.
Conclusions:
- The developed DCvC-based graphene FET sensor exhibits exceptional sensitivity and regeneration.
- Its advantages, including simplicity, low cost, label-free, and real-time response, make it highly valuable for medical diagnostics and environmental monitoring.
