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arXiv 2406.03383cond-mat.mtrl-sci
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通过电子辐照实现自支撑单层SiC的受控制备

Controlled fabrication of freestanding monolayer SiC by electron irradiation

Yunli Da, Ruichun Luo, Bao Lei, Wei Ji, Wu Zhou

AI总结:

本文提出通过在STEM中调节电子束能量和原位加热温度,在石墨烯纳米孔内受控制备自支撑单层SiC的新策略,所得材料具有宽直接带隙,并揭示了其由键旋转和原子挤出驱动的逐原子自组装机制。

摘要:

原子精度的新型量子材料的设计与制备对于探索新物理和器件应用至关重要。电子辐照已被证明是制备新型量子材料和量子结构的有效方法,这些材料和结构用其他方法难以获得。它具有对这些新材料图案化及其与具有不同功能的其他材料集成的精确控制优势。在此,我们提出了一种在石墨烯膜的纳米孔内制备自支撑单层SiC的新策略。通过调节扫描透射电子显微镜(STEM)中的入射电子束能量和原位加热温度,我们能够有效控制纳米孔的图案化以及随后在石墨烯晶格内单层SiC的生长。所得的SiC单层与石墨烯晶格无缝连接,形成以宽直接带隙为特征的平面结构。我们的原位STEM观察进一步揭示,石墨烯纳米孔内单层SiC的生长是由键旋转和原子挤出的组合驱动的,为自支撑二维(2D)单层的逐原子自组装提供了新见解。

英文摘要:

The design and preparation of novel quantum materials with atomic precision are crucial for exploring new physics and for device applications. Electron irradiation has demonstrated as an effective method for preparing novel quantum materials and quantum structures that could be challenging to obtain otherwise. It features the advantages of precise control over the patterning of such new materials and their integration with other materials with different functionalities. Here, we present a new strategy for fabricating freestanding monolayer SiC within nanopores of a graphene membrane. By regulating the energy of the incident electron beam and the in-situ heating temperature in a scanning transmission electron microscope (STEM), we can effectively control the patterning of nanopores and subsequent growth of monolayer SiC within the graphene lattice. The resultant SiC monolayers seamlessly connect with the graphene lattice, forming a planar structure distinct by a wide direct bandgap. Our in-situ STEM observations further uncover that the growth of monolayer SiC within the graphene nanopore is driven by a combination of bond rotation and atom extrusion, providing new insights into the atom-by-atom self-assembly of freestanding two-dimensional (2D) monolayers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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