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Layer specific optical band gap measurement at nanoscale in MoS2 and ReS2 van der Waals compounds by high resolution electron energy loss spectroscopy

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dc.contributor.author Dileep, K.
dc.contributor.author Sahu, R.
dc.contributor.author Sarkar, Sumanta
dc.contributor.author Peter, Sebastian C.
dc.contributor.author Datta, Ranjan
dc.date.accessioned 2017-01-24T06:28:26Z
dc.date.available 2017-01-24T06:28:26Z
dc.date.issued 2016
dc.identifier.citation Dileep, K.; Sahu, R.; Sarkar, S.; Peter, S. C.; Datta, R., Layer specific optical band gap measurement at nanoscale in MoS2 and ReS2 van der Waals compounds by high resolution electron energy loss spectroscopy. Journal of Applied Physics 2016, 119 (11), 9 http://dx.doi.org/10.1063/1.4944431 en_US
dc.identifier.citation Journal of Applied Physics en_US
dc.identifier.citation 119 en_US
dc.identifier.citation 11 en_US
dc.identifier.issn 0021-8979
dc.identifier.uri https://libjncir.jncasr.ac.in/xmlui/10572/2173
dc.description Restricted Access en_US
dc.description.abstract Layer specific direct measurement of optical band gaps of two important van der Waals compounds, MoS2 and ReS2, is performed at nanoscale by high resolution electron energy loss spectroscopy. For monolayer MoS2, the twin excitons (1.8 and 1.95 eV) originating at the K point of the Brillouin zone are observed. An indirect band gap of 1.27 eV is obtained from the multilayer regions. Indirect to direct band gap crossover is observed which is consistent with the previously reported strong photoluminescence from the monolayer MoS2. For ReS2, the band gap is direct, and a value of 1.52 and 1.42 eV is obtained for the monolayer and multilayer, respectively. The energy loss function is dominated by features due to high density of states at both the valence and conduction band edges, and the difference in analyzing band gap with respect to ZnO is highlighted. Crystalline 1T ReS2 forms two dimensional chains like superstructure due to the clustering between four Re atoms. The results demonstrate the power of HREELS technique as a nanoscale optical absorption spectroscopy tool. (C) 2016 AIP Publishing LLC. en_US
dc.description.uri 1089-7550 en_US
dc.description.uri http://dx.doi.org/10.1063/1.4944431 en_US
dc.language.iso English en_US
dc.publisher American Institute Physics en_US
dc.rights @American Institute Physics, 2016 en_US
dc.subject Physics en_US
dc.subject Microscope en_US
dc.subject Nanosheets en_US
dc.subject Graphene en_US
dc.title Layer specific optical band gap measurement at nanoscale in MoS2 and ReS2 van der Waals compounds by high resolution electron energy loss spectroscopy en_US
dc.type Article en_US


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