Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Mechanisms of Liquid-Phase Exfoliation for the Production of Graphene.
ACS Nano ( IF 15.8 ) Pub Date : 2020-06-29 , DOI: 10.1021/acsnano.0c03916 Zheling Li 1, 2 , Robert J Young 1, 2, 3 , Claudia Backes 4 , Wen Zhao 3, 5 , Xun Zhang 1 , Alexander A Zhukov 2, 6 , Evan Tillotson 1, 2 , Aidan P Conlan 1, 2 , Feng Ding 3, 5 , Sarah J Haigh 1, 2 , Kostya S Novoselov 2, 6, 7 , Jonathan N Coleman 8
ACS Nano ( IF 15.8 ) Pub Date : 2020-06-29 , DOI: 10.1021/acsnano.0c03916 Zheling Li 1, 2 , Robert J Young 1, 2, 3 , Claudia Backes 4 , Wen Zhao 3, 5 , Xun Zhang 1 , Alexander A Zhukov 2, 6 , Evan Tillotson 1, 2 , Aidan P Conlan 1, 2 , Feng Ding 3, 5 , Sarah J Haigh 1, 2 , Kostya S Novoselov 2, 6, 7 , Jonathan N Coleman 8
Affiliation
|
Liquid- phase exfoliation (LPE) is the principal method of producing two-dimensional (2D) materials such as graphene in large quantities with a good balance between quality and cost and is now widely adopted by both the academic and industrial sectors. The fragmentation and exfoliation mechanisms involved have usually been simply attributed to the force induced by ultrasound and the interaction with the solvent molecules. Nonetheless, little is known about how they actually occur, i.e., how thick and large graphite crystals can be exfoliated into thin and small graphene flakes. Here, we demonstrate that during ultrasonic LPE the transition from graphite flakes to graphene takes place in three distinct stages. First, sonication leads to the rupture of large flakes and the formation of kink band striations on the flake surfaces, primarily along zigzag directions. Second, cracks form along these striations, and together with intercalation of solvent, lead to the unzipping and peeling off of thin graphite strips that in the final stage are exfoliated into graphene. The findings will be of great value in the quest to optimize the lateral dimensions, thickness, and yield of graphene and other 2D materials in large-scale LPE for various applications.
中文翻译：
液相剥落制备石墨烯的机理。
液相剥落（LPE）是生产二维（2D）材料（例如石墨烯）的主要方法，并且在质量和成本之间取得了良好的平衡，目前已被学术界和工业界广泛采用。通常，所涉及的碎裂和剥落机制简单地归因于超声产生的力以及与溶剂分子的相互作用。尽管如此，人们对它们如何真正发生还知之甚少，即可以将厚，大的石墨晶体剥落成细小的石墨烯薄片。在这里，我们证明了在超声LPE过程中，从石墨薄片到石墨烯的转变发生在三个不同的阶段。首先，超声导致大片的破裂，并在片表面上主要沿之字形方向形成扭结带条纹。其次，沿着这些条纹形成裂纹，并与溶剂的插入一起，导致石墨薄带的解压缩和剥落，最后剥落成石墨烯。该发现对于寻求在大型LPE中针对各种应用优化石墨烯和其他2D材料的横向尺寸，厚度和屈服具有重要价值。
更新日期：2020-06-29
中文翻译：
液相剥落制备石墨烯的机理。
液相剥落（LPE）是生产二维（2D）材料（例如石墨烯）的主要方法，并且在质量和成本之间取得了良好的平衡，目前已被学术界和工业界广泛采用。通常，所涉及的碎裂和剥落机制简单地归因于超声产生的力以及与溶剂分子的相互作用。尽管如此，人们对它们如何真正发生还知之甚少，即可以将厚，大的石墨晶体剥落成细小的石墨烯薄片。在这里，我们证明了在超声LPE过程中，从石墨薄片到石墨烯的转变发生在三个不同的阶段。首先，超声导致大片的破裂，并在片表面上主要沿之字形方向形成扭结带条纹。其次，沿着这些条纹形成裂纹，并与溶剂的插入一起，导致石墨薄带的解压缩和剥落，最后剥落成石墨烯。该发现对于寻求在大型LPE中针对各种应用优化石墨烯和其他2D材料的横向尺寸，厚度和屈服具有重要价值。
京公网安备 11010802027423号