在MoS2上培养的的结构和相互作用揭示:来自混合分子动力学模拟的见解
Alexandre Melhorance Barboza1, Luis César Rodríguez Aliaga1, Daiara Fernandes de Faria1
1Department of Computational Modeling, Rio de Janeiro State University (UERJ), Polytechnic Institute (IPRJ), 25 Bonfim Street, Vila Amélia, Nova Friburgo, RJ 28625-570, Brazil.
概括
在二硫化物 (MoS2) 上的 (Si) 是稳定的,既具有范德瓦尔斯键,也具有共价键. 只有范德瓦尔斯力会导致变得不稳定并崩,这凸显了强大的二维材料系统需要更强的相互作用.
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:
- 和二硫化 (MoS2) 之间的相互作用对于确定系统性质至关重要.
- 基于的系统很难在实验和计算上进行调查,这导致了相互矛盾的文献报告.
研究的目的:
- 通过分子动力学模拟,研究在MoS2基板上的表轴生长和稳定性.
- 了解范德瓦尔斯和共价相互作用在/MoS2异构结构稳定性中的作用.
主要方法:
- 使用混合潜力的分子动力学 (MD) 模拟.
- 模拟的蒸汽沉积式方法用于MoS2.2上的表轴生长.
- 在不同的相互作用潜力下分析烯配置 (仅范德瓦尔斯与联合范德瓦尔斯和共价).
主要成果:
- 在考虑范德瓦尔斯相互作用和共价相互作用时,在MoS2上实现了稳定的AB低曲配置.
- 层中的缺陷通过增加基板温度而减少.
- 仅依赖范德瓦尔斯相互作用的系统表现出不稳定性,导致结构崩和混乱.
结论:
- 范德瓦尔斯和共价相互作用的结合对于在MoS2.2上的机械稳定性至关重要.
- 单独的范德瓦尔斯相互作用不足以保持MoS2上的质完整性,特别是考虑到格子不匹配.
- 基质温度在生长过程中的缺陷减少中起着重要作用.
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