Department of Inorganic Nonmetallic Material, School of Materials Science and Engineering, University of Science and Technology Beijing , Beijing 100083, China.
College of Materials Science and Chemical Engineering, Harbin Engineering University , Harbin 150001, China.
Langmuir. 2016 Aug 30;32(34):8641-9. doi: 10.1021/acs.langmuir.6b02422. Epub 2016 Aug 22.
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.
这项工作报道了一种通过引入活性自由基来快速大规模制备石墨烯量子点（GQDs）的改进电化学方法，这些自由基是由过氧化氢或紫外线辐射产生的。这些自由基可以加深电化学过程中工作电极的氧化或还原程度，从而导致具有高浓度和小尺寸但不同表面氧化程度的 GQDs。在这项工作中分析了改进的氧化还原机制。同时，研究了具有不同表面氧化程度的 GQDs 的光学性质和可氧化性。结果发现，这些 GQDs 可用作氧化剂，其可氧化性与其氧化程度有关。
