期刊
APPLIED SCIENCES-BASEL
卷 6, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/app6090264
关键词
transition metal dichalcogenides; 2D materials; Raman spectroscopy; exfoliation; Atomically-thin layers; semiconductors
类别
资金
- Spanish MINECO [MAT2014-56143-R]
- FEDER, Excellence Unit Maria de Maeztu [MDM- 2015-0538]
- Generalitat Valenciana
- Spanish MECD [FPU014/04407]
- European Union Horizon 2020 Marie Curie Actions [H2020/2014-659378]
- Atomic Spectroscopy, Glass-Blowing, and Microscopy sections at Central Support Service in the Experimental Research SCSIE of the University of Valencia
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.
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