Free-Radical-Assisted Rapid Synthesis of Graphene Quantum Dots and Their Oxidizability Studies
Free-Radical-Assisted Rapid Synthesis of Graphene Quantum Dots and Their Oxidizability Studies
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自由基辅助快速合成石墨烯量子点及其氧化性研究
DOI：
10.1021/acs.langmuir.6b02422
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发表时间：
2016-08-30
期刊：
影响因子：
3.9
通讯作者：
Qiu, Dengli
中科院分区：
文献类型：
--
作者：
Li, Yan;Liu, Hui;Qiu, Dengli
本文报道了一种改进的电化学方法，通过引入过氧化氢或紫外线辐射产生的活性自由基来快速大规模制备石墨烯量子点（GQDs）。这些自由基可以在电化学过程中加深工作电极的氧化或还原程度，从而形成高浓度、小尺寸但表面氧化程度不同的GQDs。对改进后的氧化还原机理进行了分析。同时，研究了不同表面氧化程度的GQDs的光学性质和氧化性。发现这些GQDs可以作为氧化剂使用，其氧化性与氧化程度有关。
This work reports a modified electrochemical method for rapid and large-scale preparing graphene quantum dots (GQDs) by introduction of active free radicals, which were produced by hydrogen peroxide or ultraviolet radiation. These free radicals can deepen the oxidized or reduced level of working electrode in electrochemical process and thus lead to GQDs with high concentration and small size, but different surface oxidized degree. The improved oxidation and reduction mechanism were analyzed in this work. Meanwhile, the optical properties and oxidizability of GQDs with different surface oxidized degree were investigated. It is found that these GQDs can be used as an oxidizing agent and their oxidizability is related to the degree being oxidized.