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Graphene quantum dots obtained by unfolding fullerene

机译：通过展开富勒烯获得的石墨烯量子点

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Graphene quantum dots (GQDs) have recently been proposed as fluorescent sensors for metal ions dissolved in water. The physical origin of this fluorescence is still not completely clear, therefore further studies on GQDs and their properties are required. Graphene-like quantum dots were prepared by oxidation and unfolding of commercial buckminsterfullerene. This process was carried out by a modified Hummers method. After dialysis, the solution was diluted with deionized water to obtain the reference solution for optical measurements. Part of the solution was dried to obtain the unfolded fullerene powder. The metal ions were allowed to interact with GQDs by adding the metal-salt water solution to the stock solution of unfolded fullerene. The properties of GQDs before and after incorporation of metal ions (Hg, Cd, Pb, Cu, Ni and As) were characterized by using X-ray photoemission spectroscopy (XPS), Auger electron spectroscopy, UV-vis and fluorescent spectroscopies. In XPS, a particular attention was given to the analysis of photoemission C 1 s and Auger C KVV spectra in order to determine the carbon electronic configuration and its changes after incorporation of metal ions into GQDs. Obtained quantum dots were composed of graphene with oxidized borders. Optical measurements showed that the interaction with metal ions was changing the fluorescence intensity and optical absorbance, with different characteristics for each distinct ionic species. This behavior could be used for a selective multiple sensor detecting different heavy metals in water solutions.
机译：近年来，已经提出了石墨烯量子点（GQD）作为用于溶解在水中的金属离子的荧光传感器。这种荧光的物理来源仍不完全清楚，因此需要对GQD及其性质进行进一步研究。石墨烯样量子点是通过商业化的buckminsterfullerene的氧化和展开制备的。该过程通过改进的悍马方法进行。透析后，将溶液用去离子水稀释以获得用于光学测量的参考溶液。将溶液的一部分干燥以获得未折叠的富勒烯粉末。通过将金属盐水溶液添加到展开的富勒烯的储备溶液中，使金属离子与GQD相互作用。通过使用X射线光电子能谱（XPS），俄歇电子能谱，紫外可见光谱和荧光光谱来表征掺入金属离子（汞，镉，铅，铜，镍和砷）前后的GQDs的性质。在XPS中，特别关注光发射C 1 s和Auger C KVV光谱的分析，以便确定碳电子构型及其在将金属离子掺入GQD中后的变化。获得的量子点由具有氧化边界的石墨烯组成。光学测量表明，与金属离子的相互作用正在改变荧光强度和光吸收率，每种不同的离子种类具有不同的特性。此行为可用于检测水溶液中不同重金属的选择性多重传感器。

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