Rate and Mechanistic Investigation of Eu(OTf)2-Mediated Reduction of Graphene Oxide at Room Temperature

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• 作者：Tufan Ghosh ; Sandeepan Maity ; Edamana Prasad
• 刊名：Journal of Physical Chemistry B
• 出版年：2014
• 出版时间：May 22, 2014
• 年：2014
• 卷：118
• 期：20
• 页码：5524-5531
• 全文大小：366K
• 年卷期：v.118,no.20(May 22, 2014)
• ISSN：1520-5207

文摘

We describe a fast, efficient, and mild approach to prepare chemically reduced graphene oxide (rGO) at room temperature using divalent europium triflate {Eu(OTf)₂}. The characterization of solution-processable reduced graphene oxide has been carried out by various spectroscopic (FT-IR, UV鈥搗isible absorption, and Raman), microscopic (TEM and AFM), and powder X-ray diffraction (XRD) techniques. Kinetic study indicates that the bimolecular rate constants for the reduction of graphene oxide are 13.7 卤 0.7 and 5.3 卤 0.1 M^鈥? s^鈥? in tetrahydrofuran (THF)鈥搘ater and acetonitrile (ACN)鈥搘ater mixtures, respectively. The reduction rate constants are two orders of magnitude higher compared to the values obtained in the case of commonly used reducing agents such as the hydrazine derivative, sodium borohydride, and a glucose鈥揳mmonia mixture. The present work introduces a feasible reduction process for preparing reduced graphene oxide at ambient conditions, which is important for bulk production of GO. More importantly, the study explores the possibilities of utilizing the unique chemistry of divalent lanthanide complexes for chemical modifications of graphene oxide.