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. 2017 Nov 25;22(12):2064. doi: 10.3390/molecules22122064

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© 2017 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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Biocompatibility of graphene oxide-PEI-NaYF₄:Er³⁺/Yb³⁺ hybrid and hybrid film. (a–c) In vitro relative cellular viability of three types of cells (RAW264.7, MC3T3-E1 and MDA) treated with graphene oxide and the graphene oxide–NaYF₄:Er³⁺/Yb³⁺ hybrid, respectively. (d) Cytotoxicity of pure graphene oxide and graphene oxide–NaYF₄:Er³⁺/Yb³⁺ films (reproduced from Ref. [32] with permission from the PCCP Owner Societies).