Enhanced Thermoelectric Efficiency in Nanocrystalline Bismuth Telluride Nanotubes

This is the accepted version of the article before typesetting. The final typeset version is published as:

Nanotechnology. 2020 Sep 4;31(36):365703.
doi: 10.1088/1361-6528/ab97d2

Abstract: We report on the thermal and thermoelectric properties of individual nanocrystalline Bi2 Te3 nanotubes synthesized by the solution phase method using 3ω method and a microfabricated testbench. Measurements show that the nanotubes offer improved ZT compared to bulk Bi2Te3 near room temperature due to an enhanced Seebeck coefficient and suppressed thermal conductivity. This improvement in ZT originates from the nanocrystalline nature and low dimensionality of the nanotubes. Domain boundary filtering of low-energy electrons provides an enhanced Seebeck coefficient. The scattering of phonons at the surface of the nanotube leads to suppressed thermal conductivity. These have been theoretically analyzed using the Boltzmann equation based on the relaxation time approximation and Landauer approach. This work clearly demonstrates the possibility of achieving enhancement in thermoelectric efficiency by combining nanocrystalline and low-dimensional systems.

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Work Title Enhanced Thermoelectric Efficiency in Nanocrystalline Bismuth Telluride Nanotubes
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Open Access
Creators
  1. DukSoo Kim
  2. Renzhong Du
  3. Shih-Ying Yu
  4. Yuewei Yin
  5. Sining Dong
  6. Qi Li
  7. Suzanne Mohney
  8. Xiaoguang Li
  9. Srinivas A Tadigadapa
Keyword
  1. Bismuth telluride nanotubes
  2. Bi2Te3 nanotubes
  3. Thermopower
  4. Thermoelectric Figure of Merit
  5. Topological insulators
  6. Thermal conductivity
License In Copyright (Rights Reserved)
Work Type Article
Acknowledgments
  1. This work was supported by the NSF under MRSEC Grant DMR-0820404. The authors acknowledge use of facilities at the PSU site of NSF NNIN. The authors would like to thank Prof. Gerald Mahan for the many discussions and insights into nanoscale thermoelectrics.
Publisher
  1. Nanotechnology
Publication Date June 22, 2020
Publisher Identifier (DOI)
  1. https://doi.org/10.1088/1361-6528/ab97d2
Deposited December 21, 2021

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Version 1
published

  • Created
  • Updated Acknowledgments Show Changes
    Acknowledgments
    • This work was supported by the NSF under MRSEC Grant DMR-0820404. The authors acknowledge use of facilities at the PSU site of NSF NNIN. The authors would like to thank Prof. Gerald Mahan for the many discussions and insights into nanoscale thermoelectrics.
  • Added Creator DukSoo Kim
  • Added Creator Renzhong Du
  • Added Creator Shih-Ying Yu
  • Added Creator Yuewei Yin
  • Added Creator Sining Dong
  • Added Creator Qi Li
  • Added Creator Suzanne Mohney
  • Added Creator Xiaoguang Li
  • Added Creator Srinivas A Tadigadapa
  • Added Bi2Te3 Nanotube Thermoelectric Measurement Manuscript.pdf
  • Updated License Show Changes
    License
    • https://rightsstatements.org/page/InC/1.0/
  • Published
  • Updated
  • Updated Keyword, Publisher, Publisher Identifier (DOI), and 2 more Show Changes
    Keyword
    • Bismuth telluride nanotubes, Bi2Te3 nanotubes, Thermopower, Thermoelectric Figure of Merit, Topological insulators, Thermal conductivity
    Publisher
    • Nanotechnology
    Publisher Identifier (DOI)
    • https://doi.org/10.1088/1361-6528/ab97d2
    Description
    • This is the accepted version of the article before typesetting. The final typeset version is published as
    • This is the accepted version of the article before typesetting. The final typeset version is published as:
    • Nanotechnology. 2020 Sep 4;31(36):365703.
    • doi: 10.1088/1361-6528/ab97d2
    • Abstract: We report on the thermal and thermoelectric properties of individual nanocrystalline Bi2 Te3 nanotubes synthesized by the solution phase method using 3ω method and a microfabricated testbench. Measurements show that the nanotubes offer improved ZT compared to bulk Bi2Te3 near room temperature due to an enhanced Seebeck coefficient and suppressed thermal conductivity. This improvement in ZT originates from the nanocrystalline nature and low dimensionality of the nanotubes. Domain boundary filtering of low-energy electrons provides an enhanced Seebeck coefficient. The scattering of phonons at the surface of the nanotube leads to suppressed thermal conductivity. These have been theoretically analyzed using the Boltzmann equation based on the relaxation time approximation and Landauer approach. This work clearly demonstrates the possibility of achieving enhancement in thermoelectric efficiency by combining nanocrystalline and low-dimensional systems.
    Publication Date
    • 2020
    • 2020-06-22
  • Updated