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. 2020 Jul 10;21(14):4888. doi: 10.3390/ijms21144888

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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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FTIR spectrum of hydrogels (H4: chitosan (CS)/graphene oxide (GO)/hydroxyapatite (HAp); H5: CS/ poly(ethylene glycol) grafted graphene oxide /HAp; H6: CS/reduced graphene oxide/HAp) peaks assigned to –OH vibrations.