A detailed high pressure X-ray diffraction and Raman spectroscopy study is carried out on monolayer WS2 and nanocrystalline WS2. The monolayer sample is obtained by liquid exfoliation. Photoluminescence and Raman measurements show it to consist of a monolayer. Careful analysis of ambient and high pressure data indicates the emergence of a triclinic phase at about 5.8 GPa in patches embedded in the parent hexagonal phase. This raises a question mark over the structural purity of the exfoliated monolayer materials beyond certain stress conditions. Raman mode values and their full width at half maximum of the monolayer sample show anomalous changes at about 27 GPa, the pressure where the sample completely gets converted to the triclinic structure indicating the importance of strain in structural as well as electronic properties of two dimensional materials.
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28 May 2018
Research Article|
May 29 2018
Structural anomalies in exfoliated WS2: High pressure investigations on monolayer and nanocrystalline tungsten disulfide
Pinku Saha;
Pinku Saha
Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata
, Mohanpur Campus, Mohanpur 741246, Nadia, West Bengal, India
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Bishnupada Ghosh;
Bishnupada Ghosh
Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata
, Mohanpur Campus, Mohanpur 741246, Nadia, West Bengal, India
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Rajesh Jana;
Rajesh Jana
Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata
, Mohanpur Campus, Mohanpur 741246, Nadia, West Bengal, India
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Goutam Dev Mukherjee
Goutam Dev Mukherjee
a)
Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata
, Mohanpur Campus, Mohanpur 741246, Nadia, West Bengal, India
a)Author to whom correspondence should be addressed: goutamdev@iiserkol.ac.in
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a)Author to whom correspondence should be addressed: goutamdev@iiserkol.ac.in
J. Appl. Phys. 123, 204306 (2018)
Article history
Received:
February 27 2018
Accepted:
May 11 2018
Citation
Pinku Saha, Bishnupada Ghosh, Rajesh Jana, Goutam Dev Mukherjee; Structural anomalies in exfoliated WS2: High pressure investigations on monolayer and nanocrystalline tungsten disulfide. J. Appl. Phys. 28 May 2018; 123 (20): 204306. https://doi.org/10.1063/1.5027020
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