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Selectively tuning ionic thermopower in all-solid-state flexible polymer composites for thermal sensing.

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This study introduces tunable all-solid-state polymer ionic thermoelectric materials with a wide thermopower range. It reveals the atomic-scale mechanism of p-n conversion, enabling self-powered thermal sensors.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Polymer Science

Background:

  • Ionic thermoelectric materials offer significant ionic thermopower.
  • Tuning thermopower in all-solid-state polymer electrolytes is challenging due to complex ion transport compared to gels.

Purpose of the Study:

  • To develop all-solid-state polymer materials with tunable thermopower.
  • To elucidate the atomic-scale mechanism of p-n conversion in ionic thermoelectric polymers.
  • To fabricate a self-powered ionic thermoelectric thermal sensor.

Main Methods:

  • Molecular dynamics simulations were used to analyze Eastman entropy changes.
  • Development of novel all-solid-state polymer ionic thermoelectric materials.
  • Fabrication and testing of a self-powered thermal sensor.

Main Results:

  • Achieved a wide tunable thermopower range of +20 to -6 mV K⁻¹ in all-solid-state polymers.
  • Revealed the fundamental mechanism of p-n conversion at the atomic scale.
  • Demonstrated a high-sensitivity and durable self-powered ionic thermoelectric thermal sensor.

Conclusions:

  • The developed materials and mechanism provide a general strategy for tuning ionic thermopower.
  • This work advances the understanding of p-n conversion in ionic thermoelectric polymers.
  • The fabricated sensor shows promising applications for ionic thermoelectric materials.