CO2 on 石墨烯:对非共价相互作用的计算方法进行基准测试
Christopher Ehlert1,2, Anna Piras1,2, Ganna Gryn'ova1,2
1Heidelberg Institute for Theoretical Studies (HITS gGmbH), Schloss-Wolfsbrunnenweg 35, 69118 Heidelberg, Germany.
ACS omega
|October 9, 2023
概括
评估了石墨烯气体传感器的计算方法. 将有限集群数据推断到无限模型准确地预测了吸附能量,SAPT和非局部函数显示了对石墨烯二氧化碳的最佳结果.
科学领域:
- 计算材料科学 计算材料科学
- 表面科学是一门科学.
- 物理化学 物理化学
背景情况:
- 设计基于石墨烯的气体传感器需要精确的气体分子吸附的计算建模.
- 选择具有成本效益但又精确的几何优化和能量计算方法对于*in silico*设计至关重要.
研究的目的:
- 评估各种计算方法来建模二氧化碳对石墨烯的吸附.
- 确定最准确和最有效的理论方法来预测吸附能量和几何.
主要方法:
- 使用密度函数 (DF),合集群理论 (CCSD) 和对称调整扰乱理论 (SAPT).
- 使用裸体和支的石墨烯的有限和周期性表面模型.
- 开发了一个方案来推断相互作用能量从有限的集群到无限的表面.
主要成果:
- 从有限的集群进行推断,准确地复制了周期性结果,消除了尺寸依赖.
- 廉价的 DF (例如,PBE-D3) 显示出与小型模型的 CCSD (T) 有很好的一致性.
- 通过SAPT推断和非局部范德瓦尔斯函数,我们得出了与石墨烯二氧化碳实验值最接近的相互作用能量.
结论:
- 通过推断有限模型数据,建立了一个可靠的*in silico*设计石墨烯气体传感器的方法.
- 建议使用SAPT和非局部范德瓦尔斯函数来对石墨烯进行精确的二氧化碳吸附能量的计算.
- 目前的方法无法复制实验观察到的Pt{111}上的倾斜CO2吸附几何,这表明需要先进的理论模型或实验修订.
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