Surface Science Research Centre, The University of Liverpool, Liverpool, United Kingdom.
Phys Rev Lett. 2011 Jun 3;106(22):226101. doi: 10.1103/PhysRevLett.106.226101. Epub 2011 Jun 2.
Recent studies show that structures based on the traditional "icelike" water bilayer are not stable on flat transition metal surfaces and, instead, more complex wetting layers are formed. Here we show that an ordered bilayer can be formed on a SnPt(111) alloy template and determine the structure of the water layer by low energy electron diffraction. Close agreement is found between experiment and the structure calculated by density functional theory. Corrugation of the alloy surface allows only alternate water molecules to chemisorb, stabilizing the H-down water bilayer by reducing the metal-hydrogen repulsion compared to a flat surface.
最近的研究表明，基于传统“冰状”双层水的结构在平坦的过渡金属表面上不稳定，而是形成更复杂的润湿层。在这里，我们表明，有序双层可以在 SnPt(111)合金模板上形成，并通过低能电子衍射确定水层的结构。实验结果与密度泛函理论计算的结构非常吻合。合金表面的波纹只允许交替的水分子化学吸附，通过减少金属-氢的排斥作用，与平坦表面相比，稳定了 H 向下的双层水。
