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. 2015 Jul 16;6:7666. doi: 10.1038/ncomms8666

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(a) Optical micrograph and atomic force microscopy images for the WSe₂/MoS₂ heterostructural stacked flakes on a sapphire substrate. (b) Photoluminescence spectra for the selected sites including MoS₂ only (A), WSe₂ only (C) and WSe₂/MoS₂ (B) stacked areas.