Breaking the Saturation of Sensitivity for Ultrawide Range Flexible Pressure Sensors by Soft‐Strain Effect
Source abstract
Abstract
Abstract The flexible pressure sensors with a broad pressure range and unsaturated sensitivity are highly desired in practical applications. However, pressure sensors by piezoresistive effect are always limited by the compressibility of sensing layers, resulting in a theoretically decreasing sensitivity of less than 100%. Here, a unique strategy is proposed that utilizes the strain effect, simultaneously achieving a trade‐off between a wider pressure detection range and unsaturated sensitivity. Ascribed to the strain effect of sensing layers induced by interlaced microdomes, the sensors possess an increased sensitivity (5.22–70 MPa−1) over an ultrawide pressure range (45 Pa–4.1 MPa), a high‐pressure resolution (5 Pa), fast response/recovery time (30/45 ms), and a robust response under a high‐pressure loading of 3.5 MPa for more than 5000 cycles. These superior sensing performances allow the sensor to monitor large pressure. The flexible pressure sensor array can assist doctors in restoring the neutral mechanical axis, tracking knee flexion angles, and extracting gait features. Moreover, the flexible sensing array can be integrated into the joint motion surveillance system to map the balance medial–lateral contact forces on the metal compartments in real time, demonstrating the potential for further development into precise medical human–machine interfaces during total knee replacement surgery.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Advanced Sensor and Energy Harvesting Materials · Advanced MEMS and NEMS Technologies · Mechanical and Optical Resonators
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Frontiers Science Center for Flexible Electronics & Institute of Flexible Electronics Northwestern Polytechnical University Xi'an 710072 China
MIIT Key Laboratory of Flexible Electronics Northwestern Polytechnical University Xi'an 710072 China
Department of Joint Surgery Honghui Hospital Health Science Center Xi'an Jiaotong University Xi'an 710054 China
MIIT Key Laboratory of Dynamics and Control of Complex Systems Northwestern Polytechnical University Xi'an 710072 China
Shaanxi Key Laboratory of Flexible Electronics Northwestern Polytechnical University Xi'an 710072 China
State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an 710054 China
State Key Laboratory of Organic Electronics and Information Displays Institute of Advanced Materials Nanjing University of Posts & Telecommunications Nanjing 210023 China
Key Laboratory of Flexible Electronics and Institute of Advanced Materials Nanjing Tech University Nanjing 211800 China
Funding
National Natural Science Foundation of China · Natural Science Foundation of Shaanxi Province · Fundamental Research Funds for the Central Universities · China Scholarship Council
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