‡Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic.
§Centre of Instrumental Techniques, Institute of Inorganic Chemistry of the AS CR, v.v.i., Husinec-Rez c.p. 1001, 250 68 Rez, Czech Republic.
ACS Nano. 2015 Mar 24;9(3):2548-55. doi: 10.1021/nn505639q. Epub 2015 Mar 11.
Graphene quantum dots is a class of graphene nanomaterials with exceptional luminescence properties. Precise dimension control of graphene quantum dots produced by chemical synthesis methods is currently difficult to achieve and usually provides a range of sizes from 3 to 25 nm. In this work, fullerene C60 is used as starting material, due to its well-defined dimension, to produce very small graphene quantum dots (∼2-3 nm). Treatment of fullerene C60 with a mixture of strong acid and chemical oxidant induced the oxidation, cage-opening, and fragmentation processes of fullerene C60. The synthesized quantum dots were characterized and supported by LDI-TOF MS, TEM, XRD, XPS, AFM, STM, FTIR, DLS, Raman spectroscopy, and luminescence analyses. The quantum dots remained fully dispersed in aqueous suspension and exhibited strong luminescence properties, with the highest intensity at 460 nm under a 340 nm excitation wavelength. Further chemical treatments with hydrazine hydrate and hydroxylamine resulted in red- and blue-shift of the luminescence, respectively.
石墨烯量子点是一类具有特殊发光性能的石墨烯纳米材料。通过化学合成方法制备的石墨烯量子点的精确尺寸控制目前难以实现，通常提供的尺寸范围为 3 至 25nm。在这项工作中，富勒烯 C60 被用作起始材料，由于其具有明确的尺寸，可以产生非常小的石墨烯量子点（约 2-3nm）。用强酸和化学氧化剂的混合物处理富勒烯 C60 会引发富勒烯 C60 的氧化、笼开和碎裂过程。合成的量子点通过 LDI-TOF MS、TEM、XRD、XPS、AFM、STM、FTIR、DLS、拉曼光谱和发光分析进行了表征和支持。量子点在水溶液中保持完全分散，并表现出很强的发光性能，在 340nm 激发波长下，最高强度位于 460nm 处。进一步用肼和羟胺进行化学处理，分别导致发光的红移和蓝移。
