Kaczmarek Agata, Hoffman Jacek, Morgiel Jerzy, Mościcki Tomasz, Stobiński Leszek, Szymański Zygmunt, Małolepszy Artur
Institute of Fundamental Technological Research Polish Academy of Science, Pawinskiego 5B, 02-106 Warsaw, Poland.
Institute of Metallurgy and Materials Science Polish Academy of Science, Reymonta 25, 30-059 Cracow, Poland.
Materials (Basel). 2021 Feb 4;14(4):729. doi: 10.3390/ma14040729.
Fluorescent carbon dots (CDs) synthesized by pulsed laser ablation in liquid (PLAL) are still interesting materials due to their possible applications. However, unlike CDs produced by the hydrothermal method, CDs produced the synthesis products by the PLAL method were never separated by dialysis, which differentiates the synthesis products and allows the identification of the main source of fluorescence. In this work, the synthesis of fluorescent carbon dots (CDs) was performed by nanosecond laser ablation of a graphite target immersed in polyethyleneimine (PEI) and ethylenediamine (EDA), and the synthesis products were separated by dialysis. The results of optical measurements showed that the main source of luminescence of the obtained nanostructures are fluorescent particles or quasi-molecular fluorophores created in the ablation process. In the case of ablation in PEI, most of the produced molecular fluorophores are associated with carbogenic nanostructures, while in the case of EDA, free fluorescent molecules dominate.
通过液体脉冲激光烧蚀（PLAL）合成的荧光碳点（CDs）因其潜在应用仍然是令人感兴趣的材料。然而，与通过水热法制备的CDs不同，通过PLAL法制备的CDs合成产物从未通过透析分离，这使得合成产物有所区别，并有助于确定荧光的主要来源。在这项工作中，通过纳秒激光烧蚀浸入聚乙烯亚胺（PEI）和乙二胺（EDA）中的石墨靶来合成荧光碳点（CDs），并通过透析分离合成产物。光学测量结果表明，所获得的纳米结构发光的主要来源是烧蚀过程中产生的荧光颗粒或准分子荧光团。在PEI中进行烧蚀的情况下，产生的大多数分子荧光团与碳质纳米结构相关，而在EDA的情况下，游离荧光分子占主导。
