液态金属催化剂:二维材料的点金石

发布时间：2018-04-14 01:30

本文选题：液态金属 + 二维材料　；参考：《物理化学学报》2017年03期

【摘要】：由于石墨烯等二维材料具有独特的结构与优异的性能,其在众多新型电子器件的构建中具有重要的应用前景。然而,其可控生长仍然存在诸多挑战性的问题,这也是制约这类明星材料真正迈向应用的瓶颈所在。化学气相沉积法(CVD)是目前可控制备高质量石墨烯最有效的方法,其中催化基底的设计尤为重要,这将直接决定CVD最为核心的两个过程:催化和传质。相较于改变催化剂的化学组成,近年来我们发现改变催化剂的物态——由固态到液态,对石墨烯等二维材料的CVD过程有质的改变和提升。与固态基底相比,液态基底具有更松散的原子排列、更剧烈的原子迁移,使得液面平滑而各向同性,液相可流动且可包埋异质原子。这使得液态金属在催化石墨烯等二维材料及其异质结生长时表现出很多独特的行为,比如层数严格自限制、超快的生长速度、晶粒拼接平滑等。更重要的是,基底的液态特性给二维材料的自组装和转移带来了突破,实乃二维材料的点金石。本文将梳理液态金属催化剂上二维材料的生长、组装与转移行为,这些关键技术的突破将为二维材料迈向真正应用奠定坚实的基础。
[Abstract]:Because of its unique structure and excellent properties, graphene and other two-dimensional materials have important application prospects in the construction of many new electronic devices.However, there are still many challenging problems in its controllable growth, which is the bottleneck that restricts the application of such star materials.Chemical vapor deposition (CVD) is the most effective method to control high quality graphene. The design of catalytic substrate is particularly important, which will directly determine the two core processes of CVD: catalysis and mass transfer.Compared with changing the chemical composition of the catalyst, we have found in recent years that changing the physical state of the catalyst from solid to liquid has a qualitative change and upgrading to the CVD process of graphene and other two-dimensional materials.Compared with the solid substrate, the liquid substrate has more loose atomic arrangement and more intense atom migration, which makes the liquid surface smooth and isotropic, and the liquid phase can flow and envelop the heterogeneous atoms.This makes liquid metal exhibit many unique behaviors in catalyzing the growth of graphene and its heterostructures, such as strict self-limitation of layers, ultra-fast growth rate, smooth grain splicing, and so on.More importantly, the liquid properties of the substrate make a breakthrough for the self-assembly and transfer of two-dimensional materials.In this paper, the growth, assembly and transfer behavior of two-dimensional materials on liquid metal catalysts will be combed. The breakthrough of these key technologies will lay a solid foundation for the real application of two-dimensional materials.
【作者单位】：武汉大学化学与分子科学学院;
【基金】：国家自然科学基金(51322209,21473124,21673161)资助项目~~
【分类号】：O643.36

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