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. 2020 Nov 5;13(21):4975. doi: 10.3390/ma13214975

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© 2020 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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The ratio of the intensities between the D, G and 2D bands: (a) I_D/I_G of GF_150 D and W series, (b) I_D/I_G of GF_300 D and W series, (c) I_D/I_G of GF_750 D and W series, (d) I_2D/I_G of GF_150 D and W series, (e) I_2D/I_G of GF_300 D and W series and (f) I_2D/I_G of GF_750 D and W series.