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A single water molecule has nothing special. However, macroscopic waterdisplays many anomalous properties at the interface, such as a high surfacetension, hydrophobicity and hydrophillicity. Although the underlying mechanismis still elusive, hydrogen bond is expected to have played an important role.An interesting question is if the few-water molecule clusters will bequalitatively different from a single molecule. Using adsorption behavior as anexample, by carefully choosing two-dimensional silicene as the substratematerial, we demonstrate that water monomer, dimer and trimer show contrastingproperties. The additional water molecules in dimer and trimer induce atransition from physisorption to chemisorption then to dissociation onsilicene. Such a hydrogen bond autocatalytic effect is expected to have a broadapplication potential in silicene-based water molecule sensor and metal-freecatalyst for water dissociation.

Water on Silicene: Hydrogen Bond Autocatalysis Induced Physisorption-Chemisorption-Dissociation Transition