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. 2017 Mar 23;7:322. doi: 10.1038/s41598-017-00068-0

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© The Author(s) 2017

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a) A PL image of WS₂/hBN. The PL image was taken with 488 nm excitation. This image is combination of transmission bright field image (monochrome) and 600–700 nm detection (red). (b) Structure model of WS₂ grown on hBN. Yellow, Green, blue and orange spheres represent sulfur, tungsten, nitrogen and boron atoms, respectively. B and N atoms are drawn with van der Waals radii, and Mo and S are drawn with the ball-and-stick model. (c) A typical Raman spectrum of WS₂/hBN. (d) A typical PL spectrum of WS₂/hBN. The excitation energy of 2.54 eV was used to measure the Raman and PL spectrum.