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

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL Carbon Pub Date : 2024-09-28 DOI:10.1016/j.carbon.2024.119667

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

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Abstract

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.

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利用时间和空间成形飞秒激光实现单层石墨烯量子点的可控光剥离

石墨烯量子点（GQDs）因其独特的电子特性而在众多领域显示出巨大的发展潜力。然而，如何获得均匀的单层量子点并解释其合成机理仍是一个关键技术问题。在此研究中，利用时间和空间成形飞秒激光烧蚀液体中的块状高取向热解石墨靶，实现了单层石墨烯量子点的快速可控光剥离，其剥离率高达80%。理论计算表明，时间成形激光可使电子激发的空间范围最小化，通过多级电子激发使外层之间的库仑斥力和最上层内的库仑爆炸最大化。上述多级光致发光导致了单层 GQD 的形成。这些发现为单层量子点的可控和快速制备提供了完美的理论解释，加速了其在储能设备中的产业化进程。

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来源期刊

Carbon 工程技术-材料科学：综合

CiteScore

20.80

自引率

7.30%

发文量

审稿时长

23 days

期刊介绍： The journal Carbon is an international multidisciplinary forum for communicating scientific advances in the field of carbon materials. It reports new findings related to the formation, structure, properties, behaviors, and technological applications of carbons. Carbons are a broad class of ordered or disordered solid phases composed primarily of elemental carbon, including but not limited to carbon black, carbon fibers and filaments, carbon nanotubes, diamond and diamond-like carbon, fullerenes, glassy carbon, graphite, graphene, graphene-oxide, porous carbons, pyrolytic carbon, and other sp2 and non-sp2 hybridized carbon systems. Carbon is the companion title to the open access journal Carbon Trends. Relevant application areas for carbon materials include biology and medicine, catalysis, electronic, optoelectronic, spintronic, high-frequency, and photonic devices, energy storage and conversion systems, environmental applications and water treatment, smart materials and systems, and structural and thermal applications.