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A High-Sensitivity Gravimetric Biosensor Based on S1 Mode Lamb Wave Resonator.
Tiancheng Luo1, Wenjuan Liu1,2, Zhiwei Wen1
1The Institute of Technological Sciences, Wuhan University, Wuhan 430072, China.
Sensors (Basel, Switzerland)
|August 12, 2022
Summary
High-frequency lithium niobate resonators enable sensitive biosensing. These microelectromechanical systems (MEMS) acoustic devices achieve high mass sensitivity for in situ detection applications.
Area of Science:
- Materials Science
- Electrical Engineering
- Biotechnology
Background:
- Microelectromechanical systems (MEMS) acoustic resonators are crucial for advanced in situ detection.
- There is a growing need for high-performance, miniaturized biosensing devices.
Purpose of the Study:
- To propose and characterize a novel lithium niobate film-based S1 mode Lamb wave resonator (HF-LWR).
- To evaluate the performance of HF-LWRs for high-sensitivity gravimetric biosensing applications.
Main Methods:
- Fabrication of X-cut lithium niobate film-based resonators with a thickness of 400 nm.
- Utilizing a PMMA layer as the mass-sensing layer for biosensor performance evaluation.
- Optimization of lithium niobate film thickness and electrode configuration.
Main Results:
- Achieved resonance frequencies exceeding 8 GHz.
- Demonstrated a maximum mass sensitivity of 74,000 Hz/(ng/cm²).
- Obtained a maximum figure of merit (FOM) of 5.52 × 10⁷.
Conclusions:
- The developed HF-LWRs show significant potential for high-sensitivity gravimetric biosensing.
- Optimized device parameters push the performance boundaries of acoustic biosensors.
- These resonators offer a promising platform for miniaturized, high-performance in situ detection systems.
