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Enhancing the Output Performance of Fiber-TENG Through Graphite Doping and Its Application in Human Motion Sensing.

You-Jun Huang1, Jen-I Chuang1, Chen-Kuei Chung1

  • 1Department of Mechanical Engineering, National Cheng Kung University, Tainan 701, Taiwan.

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Summary

This study introduces graphite-doped fiber-based nanogenerators for enhanced motion sensing. The novel graphite-doped polyester fiber-based TENG (GP@PET-TENG) significantly boosts electrical output for wearable applications.

Keywords:
energy harvesterfiberforce sensorsgraphitetriboelectric nanogenerators

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Energy Harvesting

Background:

  • Triboelectric nanogenerators (TENGs) are effective mechanical energy harvesters with high sensitivity and simple structures.
  • Fiber-based TENGs (FTENGs) are ideal for wearable motion sensors due to their flexibility, durability, and comfort.
  • Modifying FTENG electrical output through doping is an underexplored area.

Purpose of the Study:

  • To develop a graphite-doped polyester fiber-based TENG (GP@PET-TENG).
  • To investigate the impact of graphite doping on FTENG electrical performance.
  • To demonstrate the potential of GP@PET-TENG in human motion sensing and energy harvesting.

Main Methods:

  • Fabrication of a graphite-doped polyester fiber-based TENG (GP@PET-TENG).
  • Characterization of electrical output (open-circuit voltage, short-circuit current, output power) of GP@PET-TENG compared to pure PET-TENG.
  • Testing the device's ability to charge capacitors, power LEDs, and sense human motion in single-electrode mode.

Main Results:

  • The GP@PET-TENG exhibited significantly enhanced electrical performance, with open-circuit voltage increasing from 103.3 V to 202.1 V and short-circuit current from 60.7 μA to 105.1 μA.
  • The device achieved a maximum output power of 4.15 mW (2.59 W/m²), successfully charged capacitors, and powered 200 LEDs.
  • In single-electrode mode, the GP@PET-TENG detected human motion (fist-clenching, wrist-bending) with voltage signals up to 0.6 V.

Conclusions:

  • Graphite doping is an effective strategy to enhance the electrical output of fiber-based TENGs.
  • The developed GP@PET-TENG shows great promise for applications in wearable motion sensing, rehabilitation assistance, and mechanical control.
  • This work opens new avenues for optimizing FTENG performance through material modification.