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Evolution of Staircase Structures in Diffusive Convection
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Substrate-affected lattice structural evolution in compressed monolayer ReS2.

Yalan Yan1, Hao Liu, Yonghao Han

  • 1State Key Laboratory of Superhard Materials, College of Physics, Jilin University, No. 2699 Qianjin Street, Changchun 130012, People's Republic of China. cc060109@qq.com.

Physical Chemistry Chemical Physics : PCCP
|September 22, 2018
PubMed
Summary
This summary is machine-generated.

Substrate effects on compressed ReS2 were studied. Monolayer ReS2 showed strain and distorted structure under pressure, unlike multilayer ReS2, due to substrate interactions and interlayer effects.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Supported ultrathin transition metal dichalcogenides (TMDs) exhibit substrate-dependent lattice modifications at ambient conditions.
  • The influence of substrates on compressed TMDs remains incompletely understood.

Purpose of the Study:

  • To investigate the impact of an Si substrate on the lattice structures of compressed monolayer and multilayer ReS2.
  • To elucidate the distinct high-pressure behaviors of monolayer versus multilayer ReS2.

Main Methods:

  • High-pressure Raman spectroscopy measurements.
  • First-principle calculations.

Main Results:

  • Substrate-induced strain was observed in compressed monolayer ReS2, leading to S atom sliding and a distorted unit cell.
  • The Ag-5 Raman mode in monolayer ReS2 split above 1.7 GPa, indicating structural distortion.
  • In contrast, the Ag-5 mode in multilayer ReS2 remained symmetric up to 4.2 GPa, suggesting weaker substrate influence.

Conclusions:

  • Monolayer and multilayer ReS2 exhibit different responses to compression due to substrate effects and interlayer interactions.
  • The observed Ag-5 mode splitting serves as a sensitive indicator of prominent strain in compressed supported ReS2.