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. 2019 May 14;19(10):2223. doi: 10.3390/s19102223

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Raman test results of the BN/graphene/BN heterostructure: The intensity of peak G I_G of graphene is 270, the peak I_2D of graphene is 1050, and the peak strength ratio I_2D/I_G ≈ 3.89. The intensity of peak G I_G of BN/graphene/BN is 296, the peak I_2D of BN/graphene/BN is 958, and the peak strength ratio I_2D/I_G ≈ 3.24.