Pressure-driven phase transitions and reduction of dimensionality in 2D silicon nanosheets

Gil Chan Hwang, Douglas A. Blom, Thomas Vogt, Jaejun Lee, Heon Jin Choi, Sen Shao, Yanming Ma, Yongjae Lee

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In-situ high-pressure synchrotron X-ray powder diffraction studies up to 21 GPa of CVD-grown silicon 2D-nanosheets establish that the structural phase transitions depend on size and shape. For sizes between 9.3(7) nm and 15.2(8) nm we observe an irreversible phase transition sequence from I (cubic) → II (tetragonal) → V (hexagonal) during pressure increase and during decompression below 8 GPa the emergence of an X-ray amorphous phase. High-angle annular dark field scanning transmission electron microscopy (HAADF-STEM) and atomic force microscopy (AFM) images of this X-ray amorphous phase reveal the formation of significant numbers of 1D nanowires with aspect ratios > 10, which are twinned and grow along the <111> direction. We discovered a reduction of dimensionality under pressure from a 2D morphology to a 1D wire in a material with a diamond structure. MD simulations indicate the reduction of thermal conductivity in such nanowires.

Original languageEnglish
Article number5412
JournalNature communications
Volume9
Issue number1
DOIs
Publication statusPublished - 2018 Dec 1

Fingerprint

Nanosheets
Phase Transition
Silicon
Nanowires
Phase transitions
Pressure
silicon
nanowires
X-Rays
Thermal Conductivity
Powder Diffraction
X rays
Scanning Transmission Electron Microscopy
Synchrotrons
Diamond
x rays
Atomic Force Microscopy
pressure reduction
Decompression
X-Ray Diffraction

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Hwang, Gil Chan ; Blom, Douglas A. ; Vogt, Thomas ; Lee, Jaejun ; Choi, Heon Jin ; Shao, Sen ; Ma, Yanming ; Lee, Yongjae. / Pressure-driven phase transitions and reduction of dimensionality in 2D silicon nanosheets. In: Nature communications. 2018 ; Vol. 9, No. 1.
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Pressure-driven phase transitions and reduction of dimensionality in 2D silicon nanosheets. / Hwang, Gil Chan; Blom, Douglas A.; Vogt, Thomas; Lee, Jaejun; Choi, Heon Jin; Shao, Sen; Ma, Yanming; Lee, Yongjae.

In: Nature communications, Vol. 9, No. 1, 5412, 01.12.2018.

Research output: Contribution to journalArticle

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AU - Shao, Sen

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