Abstract It is often accompanied by an intense arc when solid-state graphene samples are irradiated by microwaves (MWs); however, arc spectra have not been studied. In this study, the arc spectra of reduced graphene oxide (RGO) powder, three-dimensional (3D) porous RGO, and RGO paper under MW irradiation were measured; these spectra exhibited diverse features. For the same reaction conditions and the same initial sample, the arc spectra should be the same if the reaction process and mechanisms are the same. Further analyses showed that the obtained RGO paper with an evident 2D band, a smaller D band, lower sheet resistance, and lower oxygen content was of higher quality than the RGO powder and 3D porous RGO obtained after MW irradiation. Based on these results, the diverse spectra may suggest different reaction processes and mechanisms. Overall, these findings provide novel insights into the preparation of graphene via MW reduction.

中文翻译：

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微波辐射下不同固体还原氧化石墨烯样品的电弧光谱

摘要 固态石墨烯样品在微波（MWs）照射下常伴有强烈的电弧；然而，尚未研究电弧光谱。本研究测量了还原氧化石墨烯 (RGO) 粉末、三维 (3D) 多孔 RGO 和 RGO 纸在 MW 照射下的电弧光谱；这些光谱表现出不同的特征。对于相同的反应条件和相同的初始样品，如果反应过程和机理相同，电弧光谱应该相同。进一步的分析表明，获得的 RGO 纸具有明显的 2D 带、较小的 D 带、较低的薄层电阻和较低的氧含量，其质量高于 MW 辐射后获得的 RGO 粉末和 3D 多孔 RGO。基于这些结果，不同的光谱可能表明不同的反应过程和机制。全面的，