Controllable photoexfoliation of monolayer graphene quantum dots using temporally and spatially shaped femtosecond laser

Junrui Wu, Le Ma, Lan Jiang*, Xin Li, Shaoqian Wang, Mengyao Tian, Sumei Wang, Pei Zuo

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

摘要

Graphene quantum dots (GQDs) have displayed significant momentum in numerous fields due to their unique electronic properties. However, how to obtain uniformly monolayer quantum dots and explain the synthesis mechanism are still a key technical problem. Here, a rapid and controllable photoexfoliation rate of monolayer graphene quantum dots of up to 80 % was achieved by using temporally and spatially shaped femtosecond laser to ablate bulk highly oriented pyrolytic graphite targets in liquid. Theoretical calculations suggested that the temporally shaped laser can minimize the spatial range of electron excitation, maximize the Coulomb repulsion between the outer layers and Coulomb explosion within the topmost layer through multi-level electron excitation. The above multilevel photoexfoliations lead to the formation of monolayer GQDs. These findings demonstrate a perfect theoretical explanation of controllable and rapid preparation of monolayer quantum dots, accelerating its industrialization in energy storage devices.

源语言英语
文章编号119667
期刊Carbon
230
DOI
出版状态已出版 - 11月 2024

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