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Open AccessArticle

Elucidating the Chemistry behind the Reduction of Graphene Oxide Using a Green Approach with Polydopamine

Leibniz Institute of Polymer Research Dresden (IPF), 01069 Dresden, Germany
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Nanomaterials 2019, 9(6), 902; https://doi.org/10.3390/nano9060902
Received: 15 May 2019 / Revised: 17 June 2019 / Accepted: 18 June 2019 / Published: 21 June 2019
(This article belongs to the Special Issue Green Synthesis of Nanomaterials)
A new approach using X-ray photoelectron spectroscopy (XPS) was employed to give insight into the reduction of graphene oxide (GO) using a green approach with polydopamine (PDA). In this approach, the number of carbon atoms bonded to OH and to nitrogen in PDA is considered and compared to the total intensity of the signal resulting from OH groups in polydopamine-reduced graphene oxide (PDA-GO) to show the reduction. For this purpose, GO and PDA-GO with different times of reduction were prepared and characterized by Raman Spectroscopy and XPS. The PDA layer was removed to prepare reduced graphene oxide (RGO) and the effect of all chemical treatments on the thermal and electrical properties of the materials was studied. The results show that the complete reduction of the OH groups in GO occurred after 180 min of reaction. It was also concluded that Raman spectroscopy is not well suited to determine if the reduction and restoration of the sp2 structure occurred. Moreover, a significant change in the thermal stability was not observed with the chemical treatments. Finally, the electrical powder conductivity decreased after reduction with PDA, increasing again after its removal. View Full-Text
Keywords: graphene oxide; reduced graphene oxide; X-ray photoelectron spectroscopy; Raman spectroscopy; electrical conductivity; functionalization graphene oxide; reduced graphene oxide; X-ray photoelectron spectroscopy; Raman spectroscopy; electrical conductivity; functionalization
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MDPI and ACS Style

Silva, C.; Simon, F.; Friedel, P.; Pötschke, P.; Zimmerer, C. Elucidating the Chemistry behind the Reduction of Graphene Oxide Using a Green Approach with Polydopamine. Nanomaterials 2019, 9, 902.

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