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Appl. Sci. 2016, 6(9), 264; doi:10.3390/app6090264

Raman Spectra of ZrS2 and ZrSe2 from Bulk to Atomically Thin Layers

Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Catedrático José Beltrán 2, 46980 Paterna, Spain
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Academic Editor: Andres Castellanos-Gomez
Received: 30 July 2016 / Revised: 7 September 2016 / Accepted: 8 September 2016 / Published: 15 September 2016
(This article belongs to the Special Issue Two-Dimensional Transition Metal Dichalcogenides)
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Abstract

In the race towards two-dimensional electronic and optoelectronic devices, semiconducting transition metal dichalcogenides (TMDCs) from group VIB have been intensively studied in recent years due to the indirect to direct band-gap transition from bulk to the monolayer. However, new materials still need to be explored. For example, semiconducting TMDCs from group IVB have been predicted to have larger mobilities than their counterparts from group VIB in the monolayer limit. In this work we report the mechanical exfoliation of ZrX2 (X = S, Se) from bulk down to the monolayer and we study the dimensionality dependence of the Raman spectra in ambient conditions. We observe Raman signal from bulk to few layers and no shift in the peak positions is found when decreasing the dimensionality. While a Raman signal can be observed from bulk to a bilayer for ZrS2, we could only detect signal down to five layers for flakes of ZrSe2. These results show the possibility of obtaining atomically thin layers of ZrX2 by mechanical exfoliation and represent one of the first steps towards the investigation of the properties of these materials, still unexplored in the two-dimensional limit. View Full-Text
Keywords: transition metal dichalcogenides; 2D materials; Raman spectroscopy; exfoliation; Atomically-thin layers; semiconductors transition metal dichalcogenides; 2D materials; Raman spectroscopy; exfoliation; Atomically-thin layers; semiconductors
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Mañas-Valero, S.; García-López, V.; Cantarero, A.; Galbiati, M. Raman Spectra of ZrS2 and ZrSe2 from Bulk to Atomically Thin Layers. Appl. Sci. 2016, 6, 264.

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