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Design and Fabrication of a Robust Chitosan/Polyvinyl Alcohol-Based Humidity Sensor energized by a Piezoelectric Generator

Author

Listed:
  • Zeeshan

    (Department of Electronic Engineering, Gachon University, 1342 Seongnamdaero, Seongnam-si 13120, Korea)

  • Afaque Manzoor Soomro

    (Department of Electrical Engineering, Sukkur IBA University, Sukkur 65200, Pakistan)

  • Sungbo Cho

    (Department of Electronic Engineering, Gachon University, 1342 Seongnamdaero, Seongnam-si 13120, Korea
    Department of Health Science and Technology, GAIHST, Gachon University, Incheon 21999, Korea)

Abstract

Due to their rapid growth in industrial and environmental applications, there is a need to develop self-powered humidity sensor systems with improved sensitivity, a wide detection range, and an eco-friendly nature. In this study, an aqueous solution of chitosan (CS) and polyvinyl alcohol (PVA) was blended to yield a composite film material with enhanced humidity detection properties. Meanwhile, a polyvinylidene difluoride (PVDF)-loaded chitosan composite film was developed and employed as a piezoelectric generator. Moreover, the developed composite materials for both devices (the piezoelectric generator and the humidity sensor) were optimized based on output performance. The piezoelectric generator generates a maximum of 16.2 V when a force of 10 N is applied and works as a power source for the humidity-sensing film. The sensing film swells in response to changes in relative humidity, which affects film resistance. This change in resistance causes a change in voltage through the piezoelectric generator and allows the precise measurement of relative humidity (RH). The fabricated sensor showed a linear response (R 2 = 0.981) with a reasonable sensitivity (0.23 V/% RH) in an environment with an RH range of 21–89%. In addition, the device requires no external power, and therefore, it has numerous sensing applications in various fields.

Suggested Citation

  • Zeeshan & Afaque Manzoor Soomro & Sungbo Cho, 2022. "Design and Fabrication of a Robust Chitosan/Polyvinyl Alcohol-Based Humidity Sensor energized by a Piezoelectric Generator," Energies, MDPI, vol. 15(20), pages 1-15, October.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:20:p:7609-:d:942983
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