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Fluorene-Based Two-Dimensional Covalent Organic Framework with Thermoelectric Properties through Doping.

Liangying Wang1, Bin Dong1,2, Rile Ge1

  • 1Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023, China.

ACS Applied Materials & Interfaces
|February 14, 2017
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Summary

This study introduces a novel fluorene-based covalent organic framework (FL-COF-1) for flexible thermoelectric applications. Doping with iodine significantly enhanced its thermoelectric properties, demonstrating potential for advanced energy harvesting materials.

Keywords:
covalent organic frameworkselectrical conductivityfluorene unitsiodine dopingthermoelectric properties

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Energy Harvesting

Background:

  • Organic semiconductors offer promise for flexible thermoelectric devices.
  • Covalent Organic Frameworks (COFs) are emerging materials with tunable properties.
  • Enhancing charge transport is crucial for improving thermoelectric performance.

Purpose of the Study:

  • To design and synthesize a fluorene-based covalent organic framework (FL-COF-1) for thermoelectric applications.
  • To investigate the effect of iodine doping on the thermoelectric properties of FL-COF-1.
  • To evaluate the potential of COFs as flexible thermoelectric materials.

Main Methods:

  • Synthesis of fluorene-based covalent organic framework (FL-COF-1).
  • Characterization of FL-COF-1 including BET surface area and thermal stability.
  • Iodine doping of FL-COF-1 (I2@FL-COF-1).
  • Measurement of thermoelectric properties, including Seebeck coefficient and power factor.

Main Results:

  • FL-COF-1 exhibited high thermal stability and a BET surface area > 1300 m² g⁻¹.
  • Iodine doping (I2@FL-COF-1) improved charge carrier mobility.
  • I2@FL-COF-1 demonstrated a high Seebeck coefficient (2450 μV K⁻¹) and power factor (0.063 μW m⁻¹ K⁻²) at room temperature.

Conclusions:

  • Fluorene-based COFs are promising candidates for flexible thermoelectric materials.
  • Iodine doping is an effective strategy to enhance thermoelectric performance in COFs.
  • This work presents the first example of COFs applied in thermoelectric energy harvesting.