Formation of Water Chains on CaO(001): What Drives the 1D Growth?

Formation of Water Chains on CaO(001): What Drives the 1D Growth?
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CaO(001) 上水链的形成:是什么驱动一维生长?

DOI:
10.1021/acs.jpclett.5b00223
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发表时间:
2015-04
影响因子:
5.7
通讯作者:
Sergey V. Levchenko
Sergey V. Levchenko
中科院分区:
化学2区
文献类型:
--
作者:
Hans-Joachim Freund;Martin Sterrer;Niklas Nilius;Sergey V. Levchenko

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在300 K水暴露时,观察到CaO(001)膜上部分解离的水链的形成。通过扫描隧道显微镜研究了一维组装体的形貌和取向,通过红外吸收光谱结合密度泛函理论计算确定了它们的原子结构。后者利用与原子热力学相关的从头算遗传算法来确定氧化物表面的低能H2O构型。C4v对称CaO(001)上一维结构的发展是由对称破水四聚体和在CaO晶格参数约束下吸附-吸附质与吸附-表面相互作用的良好平衡引发的。
Formation of partly dissociated water chains is observed on CaO(001) films upon water exposure at 300 K. While morphology and orientation of the 1D assemblies are revealed from scanning tunneling microscopy, their atomic structure is identified with infrared absorption spectroscopy combined with density functional theory calculations. The latter exploit an ab initio genetic algorithm linked to atomistic thermodynamics to determine low-energy H2O configurations on the oxide surface. The development of 1D structures on the C4v symmetric CaO(001) is triggered by symmetry-broken water tetramers and a favorable balance between adsorbate-adsorbate versus adsorbate-surface interactions at the constraint of the CaO lattice parameter.
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