Piezo-Capacitive Flexible Pressure Sensor with Magnetically Self-Assembled Microneedle Array
Flexible pressure sensors are pivotal in advancing artificial intelligence, the Internet of Things (IoT), and wearable technologies. While microstructuring the functional layer of these sensors effectively enhances their performance, current fabrication methods often require complex equipment and time-consuming processes. Herein, we present a novel magnetization-induced self-assembly method to develop a magnetically grown microneedle array as a dielectric layer for flexible capacitive pressure sensors. By precisely controlling the magnetic particle concentration and dynamic magnetic field strength, we achieve a tunable microneedle morphology. The resulting sensor exhibits high sensitivity (4.11 kPa<sup>-1</sup>), an ultrafast response time (20 ms), excellent cyclic stability (≈1700 cycles), and flexibility. We demonstrate real-time monitoring of various physiological signals including pulse, grip force, breathing rate, and head motion. This study introduces a promising approach for fabricating high-performance flexible sensors, potentially enabling more intuitive and effective human-machine interactions.
Authors
- Jie Shang (ORCID: https://orcid.org/0000-0003-0996-1038)
- Shengbin Li (ORCID: https://orcid.org/0000-0003-0511-1319)
- Xinyu Bai (ORCID: https://orcid.org/0000-0002-0910-758X)
- Xiangling Xia (ORCID: https://orcid.org/0000-0002-5156-8769)
- Run‐Wei Li (ORCID: https://orcid.org/0000-0003-3879-9834)
- Waqas Asghar (ORCID: https://orcid.org/0000-0002-2337-6612)
- Yiwei Liu (ORCID: https://orcid.org/0000-0001-9355-5168)
- Yifan Wang (ORCID: https://orcid.org/0000-0001-9966-682X)
- Chenxu Liu (ORCID: https://orcid.org/0000-0001-5561-2010)
- Yuanzhao Wu
Institutions
- University of Engineering and Technology Taxila (PK)
- Chinese Academy of Sciences (CN)
- Ningbo Institute of Industrial Technology (CN)
Publication Details
- Journal
- ACS Sensors
- Published
- 2025-01-27
- DOI
- https://doi.org/10.1021/acssensors.4c02895
- Citations
- 21
- Primary Topic
- Advanced Sensor and Energy Harvesting Materials
- Type
- article
- Field-Weighted Citation Impact
- 14.16
Funders
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- Youth Innovation Promotion Association of the Chinese Academy of Sciences
- K. C. Wong Education Foundation
- Natural Science Foundation of Ningbo
- Science and Technology Innovation 2025 Major Project of Ningbo
- Natural Science Foundation of Zhejiang Province
- Basic Public Welfare Research Program of Zhejiang Province