Acoustic Wave Assisted Lotus Leaf Papillae Lead-Free Piezoelectric Material Humidity Sensor
Yu Liu1, Shengxi Yuan1, Iqra Shahbaz1
1School of Chemistry and Biological Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
Small Methods
|December 13, 2025
Summary
A novel flexible humidity sensor uses "lotus-leaf acoustic wave collaborative lead-free piezoelectric" technology. This sensor achieves sub-second response times and high sensitivity for dual-mode humidity and force sensing.
Area of Science:
- Materials Science
- Nanotechnology
- Sensor Technology
Background:
- Conventional flexible humidity sensors face challenges like slow response, weak signals, and poor mechanical robustness.
- Developing advanced sensors is crucial for real-time monitoring in various applications.
Purpose of the Study:
- To develop a novel flexible multifunctional sensor overcoming limitations of existing humidity sensors.
- To achieve rapid response, high sensitivity, and dual-parameter sensing capabilities.
Main Methods:
- Fabrication of a flexible, lead-free piezoelectric composite film using a lotus leaf template, PVDF, and niobium-based perovskite crystals.
- Utilizing acoustic wave excitation to enhance water adsorption/desorption kinetics.
- Integrating dual-mode sensing for humidity and mechanical stress.
Main Results:
- Achieved exceptional humidity response/recovery times of 0.98/1.2 seconds and 97% sensitivity.
- Demonstrated a high response signal of 130 V and voltage sensitivity of 4.33 V N-1 under 40 N stress.
- The sensor outperformed commercial hygrometers in performance metrics.
Conclusions:
- The developed sensor offers sub-second response, high sensitivity, and dual-mode sensing for humidity and force.
- This technology provides secure and green core components for intelligent health and sustainable sensing systems.
- Potential applications include real-time medical monitoring, motion tracking, and environmental IoT.
