Electrochemical Reduction of Oriented Graphene Oxide Films: An in Situ Raman Spectroelectrochemical Study
Electrochemical Reduction of Oriented Graphene Oxide Films: An in Situ Raman Spectroelectrochemical Study
复制标题
DOI：
10.1021/jp811377n
复制
发表时间：
2009-05-14
影响因子：
3.7
通讯作者：
Sampath, Srinivasan
中科院分区：
文献类型：
--
作者：
Ramesha, Ganganahalli K.;Sampath, Srinivasan
氧化石墨烯(GO)是利用自组装的半胱胺单分子膜，通过逐层组装技术在金衬底上组装而成的。带负电荷的GO血小板通过静电相互作用附着在带正电荷的半胱胺单层上。结果表明，在水溶液中，通过扫描0~-1V的电位与饱和甘汞电极相比，使用外加直流偏压可以降低GO。用拉曼光谱和原子力显微镜(AFM)对氧化石墨烯(GO)和氧化石墨烯(RGO)进行了表征。观察到G带从GO的1610 cm(-1)向RGO的1585 cm(-1)明显移动。在施加直流偏压的过程中进行拉曼光谱研究，利用显微拉曼光谱对电化学还原过程进行现场跟踪。对GO和RGO薄膜进行了电导原子力显微镜表征，结果表明还原后的电流至少增加了3个数量级。GO的电化学还原方法可能会为控制GO的还原和还原程度开辟另一条途径，从而获得高导电性的石墨烯石油电极材料。
Graphene oxide (GO) is assembled on a gold substrate by a layer-by-layer technique using a self-assembled cystamine monolayer. The negatively charged GO platelets are attached to the positively charged cystamine monolayer through electrostatic interactions. Subsequently, it is shown that the GO can be reduced electrochemically using applied DC bias by scanning the potential from 0 to -1 V vs a saturated calomel electrode in an aqueous electrolyte. The GO and reduced graphene oxide (RGO) are characterized by Raman spectroscopy and atomic force microscopy (AFM). A clear shift of the G band from 1610 cm(-1) of GO to 1585 cm(-1) of RGO is observed. The electrochemical reduction is followed in Situ by micro Raman spectroscopy by carrying out Raman spectroscopic studies during the application of DC bias. The GO and RGO films have been characterized by conductive AFM that shows an increase in the current flow by at least 3 orders of magnitude after reduction. The electrochemical method of reducing GO may open up another way of controlling the reduction of GO and the extent of reduction to obtain highly conducting graphene oil electrode materials.