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. 2020 Mar 15;10(3):528. doi: 10.3390/nano10030528

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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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Surface morphology evaluated by (a,b) optical microscopy, and by (c,d) atomic force microscopy of Gr/ ${SiO}_{2}$ and CDs/Gr/ ${SiO}_{2}$ , respectively. In panel (d), the CDs deposited on ${SiO}_{2}$ (CDs/ ${SiO}_{2}$ ) and CDs deposited on graphene (CDs/Gr) can be distinguished. In addition, in panels (c,d), representative profile is reported (blue line) on the corresponding section line.