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<p>The speedy advancements in healthcare sectors have created a huge demand in wearable sensors capable of recognizing human body movements. Monitoring body mobility is crucial for injury prevention, rehabilitation progress tracking, and early health issue discovery. Additionally, it facilitates intelligent healthcare systems that are connected with IoT technology and permits real-time health evaluation. The challenge remains in the adaptability and limited lifetime of the power source used for powering these sensors. The present work introduces a flexible wearable pressure sensor made of Potassium Sodium Niobate [K<sub>0.5</sub>Na<sub>0.5</sub>NbO<sub>3</sub> (KNN)] based piezoelectric nanoparticles, in which the KNN nanoparticles were prepared by a cost-effective solid state synthesis technique. The flexibility has been achieved by blending the KNN nanoparticles with polydimethylsiloxane (PDMS) polymer, to produce the composite film. The piezoelectric nanogenerator (PENG) device made of the as synthesized KNN composite film generates a peak-to-peak electrical output of 60&#xa0;V and 0.7 µA respectively with the power density of 3.7 mW/m<sup>2</sup> at the load resistance of 800 MΩ. Capacitor charging analysis had been done to validate the generated electrical output from the device. Also, the device has been used to sense human body movements by attaching on the elbows in hands and knee joints in the legs. The device could sense the human body movements easily upon bending and releasing. Similarly, the device has been used to test its real-time application of impact sensing by dropping the smaller objects and by tapping with high impact human stepping by 50 to 100&#xa0;kg humans. The above analysis and the results prove that the fabricated pressure sensor is capable for real-time applications in healthcare sector in connection with IoT systems.</p>

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A flexible lead-free piezoelectric composite film based on K0.5Na0.5NbO3 piezoelectric nanogenerator for self-powered wearable movement monitoring and pressure sensing

  • 期刊论文

  • 发表日期：

    2026年7月24日

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  • Dhara Sateesh,
  • Kaliyannan Manojkumar,
  • Venkateswaran Vivekananthan

摘要

The speedy advancements in healthcare sectors have created a huge demand in wearable sensors capable of recognizing human body movements. Monitoring body mobility is crucial for injury prevention, rehabilitation progress tracking, and early health issue discovery. Additionally, it facilitates intelligent healthcare systems that are connected with IoT technology and permits real-time health evaluation. The challenge remains in the adaptability and limited lifetime of the power source used for powering these sensors. The present work introduces a flexible wearable pressure sensor made of Potassium Sodium Niobate [K0.5Na0.5NbO3 (KNN)] based piezoelectric nanoparticles, in which the KNN nanoparticles were prepared by a cost-effective solid state synthesis technique. The flexibility has been achieved by blending the KNN nanoparticles with polydimethylsiloxane (PDMS) polymer, to produce the composite film. The piezoelectric nanogenerator (PENG) device made of the as synthesized KNN composite film generates a peak-to-peak electrical output of 60 V and 0.7 µA respectively with the power density of 3.7 mW/m2 at the load resistance of 800 MΩ. Capacitor charging analysis had been done to validate the generated electrical output from the device. Also, the device has been used to sense human body movements by attaching on the elbows in hands and knee joints in the legs. The device could sense the human body movements easily upon bending and releasing. Similarly, the device has been used to test its real-time application of impact sensing by dropping the smaller objects and by tapping with high impact human stepping by 50 to 100 kg humans. The above analysis and the results prove that the fabricated pressure sensor is capable for real-time applications in healthcare sector in connection with IoT systems.