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Multifunctional Self-Powered PVDF/TiO2 Nanowire Platform for Energy Harvesting and Precision Vortex Flow Sensing.

Hosna Soleymani1, Mohammad Mahdi Abolhasani1, Mohammad Noormohammadi2

  • 1Department of Chemical Engineering, University of Kashan, 8731753153 Kashan, Iran.

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Summary

This study presents a novel piezoelectric nanogenerator (PENG) using a PVDF/TNT composite. This device efficiently harvests energy and detects subtle fluid flow variations, enabling self-powered sensing networks.

Keywords:
energy harvestingpiezoelectric nanogeneratorpolyvinylidene fluoridetitanium oxide nanotubesvortex flowmeter sensor

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Area of Science:

  • Materials Science and Engineering
  • Nanotechnology
  • Energy Harvesting

Background:

  • Precise detection of fluid flow variations is crucial for environmental monitoring and industrial applications.
  • Existing flowmeters often lack sensitivity for subtle variations or require external power sources.

Purpose of the Study:

  • To develop a multifunctional piezoelectric nanogenerator (PENG) capable of both energy harvesting and sensitive fluid flow detection.
  • To engineer a novel composite material using poly(vinylidene fluoride) (PVDF) and titanium dioxide nanotubes (TNT) for enhanced performance.

Main Methods:

  • A confined phase-inversion technique was employed to create a PVDF/TNT composite with aligned TiO2 nanotubes.
  • The composite's self-poling behavior due to PVDF nanowire growth within the TNT template was utilized.
  • The device was tested for energy harvesting capabilities and integrated into a bluff-body flow setup for vortex-induced voltage signature detection.

Main Results:

  • The PVDF/TNT nanogenerator achieved a high open-circuit voltage of 48.6 V and a power density of 0.93 mW/cm².
  • It successfully detected vortex-induced voltage signatures, enabling flow detection at wind speeds as low as 4.04 m/s.
  • Experimental results closely matched computational fluid dynamics simulations for vortex frequency.

Conclusions:

  • The developed PVDF/TNT nanogenerator demonstrates high-power energy harvesting and sensitive fluid flow sensing capabilities.
  • The self-poling behavior enhances piezoelectric performance without external electrical poling.
  • This multifunctional device offers a promising platform for self-powered, next-generation fluidic sensing networks.