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. 2020 Jan 9;10(1):124. doi: 10.3390/nano10010124

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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/).

PMC Copyright notice

Schematics displaying the (a) roles of graphene layers of graphene/TiO₂ composite in photocatalysis, and (b) charge transfer mechanism under ultraviolet or visible light irradiation. Reproduced with permission from [145,153], respectively. Copyright MDPI, 2018 and 2017.