College of Materials Science and Engineering, Linyi University, Linyi 276000, Shandong, China; College of Materials Science and Engineering, Institute for Graphene Applied Technology Innovation, Collaborative Innovation Centre for Marine Biomass Fibers, Materials and Textiles of Shandong Province, Qingdao University, Qingdao 266071, China.
College of Materials Science and Engineering, Institute for Graphene Applied Technology Innovation, Collaborative Innovation Centre for Marine Biomass Fibers, Materials and Textiles of Shandong Province, Qingdao University, Qingdao 266071, China; College of Life Sciences, Qingdao University, Qingdao 266071, China.
J Colloid Interface Sci. 2021 Jul 15;594:460-465. doi: 10.1016/j.jcis.2021.03.044. Epub 2021 Mar 15.
Graphene quantum dots (GQDs) are attractive fluorescent nanoparticles that have wide applicability, are inexpensive, nontoxic, photostable, water-dispersible, biocompatible and environmental-friendly. Various strategies for the synthesis of GQDs have been reported. However, simple and efficient methods of producing GQDs with control over the size of the GQDs, and hence their optical properties, are sorely needed. Herein, an ultra-fast and efficient laser writing technique is presented as a means to produce GQDs with homogeneous size from graphene produced by the instantaneous photothermal gasification and recrystallization mechanism. Controlling the laser scan speed and output power, the yield of GQDs can reach to be about 31.458 mg/s, which shows promising potential for large-scale production. The entire process eliminates the need for chemical solvents or any other reagents. Notably, the prepared laser writing produced GQDs (LWP-GQDs) exhibit blue fluorescence under UV irradiation of 365 nm and the Commission Internationale de L'Eclairage (CIE) chromaticity coordinates is measured at (0.1721, 0.123). Overall, this method exhibits superior advantages over the complex procedures and low yields required by other existing methods, and thus has great potential for the commercial applications.
石墨烯量子点（GQDs）是一种具有广泛适用性、成本低、无毒、光稳定性好、水分散性好、生物相容性好和环境友好的荧光纳米粒子。已经报道了各种合成 GQDs 的策略。然而，简单高效的方法生产具有尺寸可控性的 GQDs，从而控制其光学性质，是非常需要的。本文提出了一种超快、高效的激光写入技术，用于生产由瞬间光热气化和再结晶机制产生的石墨烯均匀尺寸的 GQDs。通过控制激光扫描速度和输出功率，可以达到约 31.458mg/s 的 GQDs 产率，这表明其具有大规模生产的巨大潜力。整个过程无需使用化学溶剂或任何其他试剂。值得注意的是，所制备的激光写入产生的 GQDs（LWP-GQDs）在 365nm 的紫外光照射下发出蓝色荧光，其国际照明委员会（CIE）色度坐标为（0.1721，0.123）。总的来说，与其他现有方法所需的复杂工艺和低产率相比，该方法具有优越的优势，因此具有很大的商业应用潜力。
