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Significant Improvement in Electrical Conductivity and Figure of Merit of Nanoarchitectured Porous SrTiO3 by La Doping Optimization

Journal Article


Abstract


  • SrTiO3 is a well-studied n-type metal oxide based thermoelectric (TE) material. In this work, the first-principles calculation of La-doped SrTiO3 has been performed using the density functional theory. In addition, high TE properties of bulk SrTiO3 material have been achieved by introducing nanoscale porosity and optimizing carrier concentration by La doping. The X-ray diffraction, atomic resolution scanning transmission electron microscopy imaging, and energy-dispersive X-ray spectrometry results show that La has been doped successfully into the lattice. The scanning electron microscopy images confirm that all the samples have nearly similar nanoscale porosities. The significant enhancement of electrical conductivity over the broad temperature range has been observed through optimization of La doping. Additionally, the samples possess very low thermal conductivity, which is speculated because of the nanoscale porosity of the samples. Because of this dual mechanism of doping optimization and nanoscale porosity, there is a remarkable improvement in power factor, 1 mW/m2K from 650 to 800 K, and figure of merit, zT of 0.26 at 850 K, of the sample, 22 at. % La-doped SrTiO3.

Authors


  •   Ahmed, Al Jumlat (external author)
  •   Hossain, Md Shahriar
  •   Nazrul Islam, Sheik Md Kazi (external author)
  •   Yun, Frank (external author)
  •   Yang, Guangsai (external author)
  •   Hossain, Ridwone (external author)
  •   Khan, Aslam (external author)
  •   Na, Jongbeom (external author)
  •   Eguchi, Miharu (external author)
  •   Yamauchi, Yusuke (external author)
  •   Wang, Xiaolin

Publication Date


  • 2020

Citation


  • Ahmed, A., Hossain, M., Nazrul Islam, S., Yun, F., Yang, G., Hossain, R., Khan, A., Na, J., Eguchi, M., Yamauchi, Y. & Wang, X. (2020). Significant Improvement in Electrical Conductivity and Figure of Merit of Nanoarchitectured Porous SrTiO3 by La Doping Optimization. ACS Applied Materials and Interfaces, 12 (25), 28057-28064.

Scopus Eid


  • 2-s2.0-85087111219

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/4211

Number Of Pages


  • 7

Start Page


  • 28057

End Page


  • 28064

Volume


  • 12

Issue


  • 25

Place Of Publication


  • United States

Abstract


  • SrTiO3 is a well-studied n-type metal oxide based thermoelectric (TE) material. In this work, the first-principles calculation of La-doped SrTiO3 has been performed using the density functional theory. In addition, high TE properties of bulk SrTiO3 material have been achieved by introducing nanoscale porosity and optimizing carrier concentration by La doping. The X-ray diffraction, atomic resolution scanning transmission electron microscopy imaging, and energy-dispersive X-ray spectrometry results show that La has been doped successfully into the lattice. The scanning electron microscopy images confirm that all the samples have nearly similar nanoscale porosities. The significant enhancement of electrical conductivity over the broad temperature range has been observed through optimization of La doping. Additionally, the samples possess very low thermal conductivity, which is speculated because of the nanoscale porosity of the samples. Because of this dual mechanism of doping optimization and nanoscale porosity, there is a remarkable improvement in power factor, 1 mW/m2K from 650 to 800 K, and figure of merit, zT of 0.26 at 850 K, of the sample, 22 at. % La-doped SrTiO3.

Authors


  •   Ahmed, Al Jumlat (external author)
  •   Hossain, Md Shahriar
  •   Nazrul Islam, Sheik Md Kazi (external author)
  •   Yun, Frank (external author)
  •   Yang, Guangsai (external author)
  •   Hossain, Ridwone (external author)
  •   Khan, Aslam (external author)
  •   Na, Jongbeom (external author)
  •   Eguchi, Miharu (external author)
  •   Yamauchi, Yusuke (external author)
  •   Wang, Xiaolin

Publication Date


  • 2020

Citation


  • Ahmed, A., Hossain, M., Nazrul Islam, S., Yun, F., Yang, G., Hossain, R., Khan, A., Na, J., Eguchi, M., Yamauchi, Y. & Wang, X. (2020). Significant Improvement in Electrical Conductivity and Figure of Merit of Nanoarchitectured Porous SrTiO3 by La Doping Optimization. ACS Applied Materials and Interfaces, 12 (25), 28057-28064.

Scopus Eid


  • 2-s2.0-85087111219

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/4211

Number Of Pages


  • 7

Start Page


  • 28057

End Page


  • 28064

Volume


  • 12

Issue


  • 25

Place Of Publication


  • United States