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High-Performance Integrated Self-Powered PNP Hydrogel Sensor for Wearable Human Monitoring.

Jiawei Long^1,2, Pan Niu^1,2, Hongbing Li^1,2

¹State Key Laboratory of Advanced Glass Materials, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.

|July 15, 2026

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This study introduces a novel PAM-5 hydrogel for high-performance flexible sensors. The resulting self-powered hydrogel sensor shows excellent durability and sensitivity for wearable technology and health monitoring applications.

Area of Science:

Materials Science
Sensor Technology
Biomedical Engineering

Background:

Advancements in wearable technology necessitate high-performance flexible sensors.
Hydrogels offer unique properties for flexible electronic device development.
Existing flexible sensors face challenges in durability and sensitivity.

Purpose of the Study:

To develop and characterize a novel PAM-5 hydrogel for flexible sensor applications.
To fabricate and evaluate a self-powered hydrogel sensor based on the PAM-5 material.
To demonstrate the potential of the hydrogel sensor in real-time physiological monitoring and human-machine interfaces.

Main Methods:

Synthesis and characterization of PAM-5 hydrogel, focusing on mechanical and electrical properties.

Keywords:

PAM human sensing integrated ion migration self-powered

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Fabrication of a PNP-5 integrated hydrogel sensor.

Testing of the sensor's performance, including sensing range, sensitivity, response time, and durability over 1000 cycles.

Real-time monitoring of physiological signals (finger bending, respiration, grasping) and spatial pressure mapping with a 5x5 array touchpad.

Main Results:

PAM-5 hydrogel exhibits high tensile strain (425%), compressive modulus (325 kPa), and ionic conductivity (1.1 S/m).
The fabricated hydrogel sensor demonstrates an extensive sensing range (2-53 kPa), high sensitivity, and rapid response time (~321 ms).
The sensor maintained consistent voltage output (~6.5 mV) over 1000 compression cycles, indicating excellent durability and stability.
Successful real-time monitoring of various physiological movements and spatial pressure mapping was achieved.

Conclusions:

The developed PAM-5 hydrogel provides a robust mechanical and electrical foundation for advanced flexible sensors.
The self-powered hydrogel sensor exhibits superior performance metrics, including durability and sensitivity.
The device shows significant potential for applications in wearable sensing, health monitoring, and human-machine interface systems.