Silva Cláudia, Simon Frank, Friedel Peter, Pötschke Petra, Zimmerer Cordelia
Leibniz Institute of Polymer Research Dresden (IPF), 01069 Dresden, Germany.
Nanomaterials (Basel). 2019 Jun 21;9(6):902. doi: 10.3390/nano9060902.
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 sp 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.
采用一种使用X射线光电子能谱（XPS）的新方法，以深入了解使用聚多巴胺（PDA）的绿色方法还原氧化石墨烯（GO）的过程。在这种方法中，考虑与PDA中OH和氮键合的碳原子数量，并将其与聚多巴胺还原氧化石墨烯（PDA-GO）中OH基团产生的信号总强度进行比较，以显示还原情况。为此，制备了不同还原时间的GO和PDA-GO，并通过拉曼光谱和XPS进行表征。去除PDA层以制备还原氧化石墨烯（RGO），并研究了所有化学处理对材料热性能和电性能的影响。结果表明，反应180分钟后，GO中的OH基团完全还原。还得出结论，拉曼光谱不太适合确定sp结构的还原和恢复是否发生。此外，化学处理未观察到热稳定性的显著变化。最后，用PDA还原后电粉末导率降低，去除PDA后再次升高。
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