Abstract In the present investigation we report a comparative study of Graphene Oxide (GO) in regard to its bandgap variations arising due to different reduction methods such as thermal reduction (Heating), electrical reduction (Voltage Application) and chemical reduction (Hydrazine hydrate). This study reveals that among the GO three reduction method studied the voltage application is the most efficient one. It is found that band gap increases with decreasing carbon to oxygen (C/O) ratio and is found to be maximum, i.e. ~4, for the case of GO reduced via voltage application reduction method. The GO for the present study was synthesized by modified Hummer’s Method in four batches out of which the three obtained solutions were reduced by thermal reduction, Voltage application and Hydrazine hydrate. The four resultant materials were investigated by XRD, FTIR, UV–Vis, SEM-EDX and Raman analysis. The variation of band gap of GO and reduced graphene oxide (rGO) was found to be GO 3.34 eV , TrGO (Heating) 2.96 eV, HrGO (Hydrazine) 2.68 eV and VrGO (Voltage application) 2.54 eV, respectively.

中文翻译：

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不同还原路线氧化石墨烯带隙变化的研究

摘要 在本研究中，我们报告了氧化石墨烯 (GO) 的带隙变化的比较研究，这些变化是由于热还原（加热）、电还原（电压应用）和化学还原（水合肼）等不同还原方法引起的。该研究表明，在所研究的 GO 三种还原方法中，电压施加是最有效的一种。发现带隙随着碳与氧（C/O）比的降低而增加，并且对于通过施加电压降低方法减少的GO的情况，发现带隙最大，即~4。本研究的 GO 是通过改进的 Hummer 方法分四批合成的，其中三个获得的溶液通过热还原、施加电压和水合肼还原。通过XRD，FTIR，UV-Vis，SEM-EDX和拉曼分析对四种所得材料进行了研究。发现 GO 和还原氧化石墨烯 (rGO) 的带隙变化分别为 GO 3.34 eV、TrGO（加热）2.96 eV、HrGO（肼）2.68 eV 和 VrGO（电压应用）2.54 eV。