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Network Covalent Solids

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...

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Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices

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可扩展的高流动性石墨烯/hBN异构结构.

Leonardo Martini¹, Vaidotas Mišeikis^1,2, David Esteban³

¹Center for Nanotechnology Innovation@NEST, Istituto Italiano di Tecnologia, Piazza San Silvestro 12, 56127 Pisa, Italy.

ACS applied materials & interfaces

|July 31, 2023

概括

使用可扩展的方法实现了高质量的石墨烯-六角化 (hBN) 异构结构. 这一进步显著提升了石墨烯的性能.

关键词:

在CVD中,CVD是非常重要的.运营商移动性的运营商移动性石墨烯是一种石墨烯.hBNBN 在线阅读可扩展性可扩展性.范德瓦尔斯的异构结构是异构结构.

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科学领域:

材料科学材料科学材料科学
凝聚物质物理学凝聚物质物理学
纳米技术纳米技术

背景情况:

石墨烯-六角化 (hBN) 异构结构对于先进的石墨烯应用至关重要.
需要可扩展的制造方法来实现这些材料的全部潜力.

研究的目的:

用可扩展的技术来证明高质量的石墨烯-hBN异构结构的制造.
评估制造的异构结构的结构,化学和电子特性.
评估开发的制造方法的性能和可扩展性.

主要方法:

使用离子束辅助物理蒸汽沉积在SiO₂/Si基板上的连续六角化 (hBN) 薄膜的生长.
使用化学蒸汽沉积在铜上的单晶石墨烯的生长.
将石墨烯转移到hBN/SiO₂/Si基板上,以形成异构结构.
使用原子力显微镜,拉曼光谱和电传输测量进行了表征.
使用传输长度方法评估设备性能.

主要成果:

通过可扩展的方法成功制造出高质量的石墨烯-hBN异构结构.
在环境条件下,石墨烯载体流动性超过10,000 cm2 / Vs,比SiO2 / Si.s上的石墨烯提高了30%.
通过在厘米尺度上测量超过100个设备来证明可扩展性,从而产生平均载体移动性为7500 ± 850 cm2 / Vs.

结论:

开发的全可扩展的方法产生了高质量的石墨烯-hBN异构结构.
这些异构结构表现出增强的电子特性,使它们适合高性能石墨烯基电子和光电子.
可扩展的制造方法是向石墨烯设备商业化迈出的重要一步.