Properties of physisorbed water layers on gold revealed in a FEM study
| Autor: | Konstantin Nikiforov, J. Plšek, P. Hrubý, Z. Knor |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Chemistry
Analytical chemistry General Physics and Astronomy chemistry.chemical_element Surfaces and Interfaces General Chemistry Tungsten Condensed Matter Physics Dissociation (chemistry) Surfaces Coatings and Films Amorphous solid Field emission microscopy Field electron emission Electric field Work function Atomic physics Voltage |
| Zdroj: | Applied Surface Science. 252:1553-1560 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2005.02.133 |
| Popis: | Field emission study of thin water layers was performed to examine their properties and their changes after application of a high electric field. Comparison of field emission characteristics of water layers adsorbed on clean tungsten and gold-covered tungsten suggested that, whereas water molecules adsorbed on tungsten are oriented by oxygen atoms towards the metal surface, water layer on gold-covered tungsten has amorphous character with no preferential orientation. Both heated and non-heated layers are heavily influenced by applied high electric field strengths (F ≈30 MV/cm). Decrease of the work function and of the voltage needed for a constant emission current during successive increase of the electric field was tentatively interpreted in terms of chemical and morfological changes of the water layer due to the field dissociation and solvation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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