pH-driven, reversible epoxy ring opening/closing in graphene oxide
pH-driven, reversible epoxy ring opening/closing in graphene oxide
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DOI：
10.1016/j.carbon.2014.12.054
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发表时间：
2015-04-01
期刊：
影响因子：
10.9
通讯作者：
Matsumoto, Yasumichi
中科院分区：
文献类型：
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作者：
Taniguchi, Takaaki;Kurihara, Seiji;Matsumoto, Yasumichi
氧化石墨烯（GO）中的氧官能团（OFG）负责独特的光、电、磁以及离子、液体和气体传输性质。在本研究中，我们已经发现可逆的环氧开放/关闭反应在GO碱和酸处理后，分别在环境条件下。我们认为GO的独特性质，包括碳阳离子的稳定性和表面上的快速质子迁移，使不寻常的pH值驱动的环氧环打开/关闭反应。我们的实验结果表明，一个不可逆的环氧形成碱处理的GO通量条件下观察到的是由于分解的vic-二醇基团形成环氧开环在碱性溶液中。高浓度的基面环氧化物是GO的显著特征。因此，可逆环氧形成应该是我们理解GO的反应性和性质的重要部分。例如，环氧开环可以是在碱性条件下GO分散体的异常光致发光（PL）猝灭的机制。(C)2014爱思唯尔有限公司版权所有。
Oxygen functional groups (OFGs) in graphene oxide (GO) are responsible for the unique optical, electrical, magnetic as well as ionic, liquid and gaseous transport properties. In the present study, we have discovered reversible epoxide opening/closing reactions in GO upon alkaline and acid treatments, respectively, under ambient conditions. We suggest that unique properties of GO including stability of the carbocation and fast proton migration on the surfaces enable the unusual pH-driven epoxide ring opening/closing reactions. Our experimental results indicate that an irreversible epoxy formation observed in base-treated GO under flux conditions is due to the decomposition of the vic-diol groups formed by epoxy ring opening in alkaline solutions. A high concentration of basal plane epoxides is a remarkable feature of GO. Thus, the reversible epoxy formation should be an important part of our understanding of reactivity and properties of GO. For example, the epoxy ring opening can be a mechanism for anomalous photoluminescent (PL) quenching of GO dispersions in alkaline conditions. (C) 2014 Elsevier Ltd. All rights reserved.