The effect of Se doping on the growth of Te nanorods

Junghyeok Kwak, Chang Eun Kim, Yuho Min, Ji Hwan Lee, Aloysius Soon, Unyong Jeong

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In this study, we successfully conducted a series of computationally-assisted experiments, regarding the morphology control and chemical transformation of Te nanorods. The morphology of Te nanorods is controlled by introducing a minute amount of isovalent Se dopant. Density-functional theory calculations predicted the Gibbs surface free energy change due to the adsorbent Se on the major facets of Te nanorods. Encouraged by the theoretical prediction, we conducted experiments on Te nanorod growth and did find significant variation of the morphology of Te nanorods due to Se injection. Furthermore, we demonstrated the chemical transformation of the shape-controlled Te nanorods to binary thermoelectric compounds such as PbTe and Bi2Te3 without losing the tailored morphology. The transformed PbTe and Bi2Te3 have nanoscale grain boundaries as seen from the cross-section HRTEM image. We emphasize that the robust production of morphology-controlled thermoelectric nanorods can be an optimal approach to develop an advanced thermoelectric composite material, by which the multiscale phonon scattering effect can be maximized.

Original languageEnglish
Pages (from-to)5734-5743
Number of pages10
JournalCrystEngComm
Volume17
Issue number30
DOIs
Publication statusPublished - 2015 Aug 14

Fingerprint

Nanorods
nanorods
Doping (additives)
Phonon scattering
adsorbents
Adsorbents
Free energy
Density functional theory
flat surfaces
Grain boundaries
grain boundaries
Experiments
free energy
injection
density functional theory
composite materials
cross sections
Composite materials
predictions
scattering

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Kwak, J., Kim, C. E., Min, Y., Lee, J. H., Soon, A., & Jeong, U. (2015). The effect of Se doping on the growth of Te nanorods. CrystEngComm, 17(30), 5734-5743. https://doi.org/10.1039/c4ce02431a
Kwak, Junghyeok ; Kim, Chang Eun ; Min, Yuho ; Lee, Ji Hwan ; Soon, Aloysius ; Jeong, Unyong. / The effect of Se doping on the growth of Te nanorods. In: CrystEngComm. 2015 ; Vol. 17, No. 30. pp. 5734-5743.
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Kwak, J, Kim, CE, Min, Y, Lee, JH, Soon, A & Jeong, U 2015, 'The effect of Se doping on the growth of Te nanorods', CrystEngComm, vol. 17, no. 30, pp. 5734-5743. https://doi.org/10.1039/c4ce02431a

The effect of Se doping on the growth of Te nanorods. / Kwak, Junghyeok; Kim, Chang Eun; Min, Yuho; Lee, Ji Hwan; Soon, Aloysius; Jeong, Unyong.

In: CrystEngComm, Vol. 17, No. 30, 14.08.2015, p. 5734-5743.

Research output: Contribution to journalArticle

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Kwak J, Kim CE, Min Y, Lee JH, Soon A, Jeong U. The effect of Se doping on the growth of Te nanorods. CrystEngComm. 2015 Aug 14;17(30):5734-5743. https://doi.org/10.1039/c4ce02431a