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Properties of monolayer and multilayer Ni films on the Ru(0001) surface
| Content Provider | Semantic Scholar |
|---|---|
| Author | Berlowitz, Paul Joseph Houston, Jack E. White, Jonathan Michael Goodman, David Wayne |
| Copyright Year | 1988 |
| Abstract | The adsorption, growth and chemisorptive properties of ultra-thin Ni films ( < 10 monolayers (ML)) on the Ru(0001) surface were studied by Auger electron spectroscopy (AES), low energy electron diffraction (LEED), temperature programmed desorption (TPD) and work function (φ) measurements. LEED studies show that submonolayer coverages of Ni at 100 K are dispersed and disordered, but form well ordered 2D islands pseudomorphic to the Ru(0001) substrate upon annealing to approximately 700 K. Above 1 ML, a layer-by-layer growth pattern is observed after annealing to approximately 700 K, but these layers show evidence of periodic strain and misfit dislocations. Annealing films thicker than 1 ML to 1100 K results in the formation of 3D islands leaving a large portion of the Ru(0001) surface covered only by the single pseudomorphic Ni layer. The work function change, Δφ, varies linearly with Ni coverage, reaching −410 meV at 1 ML. With additional Ni deposition, Δφ rises to −260 meV which is the difference in work function between bulk Ru(0001) and bulk Ni(111) surfaces. First-order desorption kinetics are observed for thermal desorption of Ni up to a coverage of 4 ML; coverages greater than 4 ML exhibit near-zero-order desorption kinetics. The activation energy for desorption increases from 76k cal/mol at low Ni coverages to 91 kcal/mol at 5 ML coverage. CO desorbs at a higher temperature from the pseudomorphic Ni ML than from either Ni(111) or Ru(0001) indicating considerable electronic perturbation of the Ni monolayer. |
| Starting Page | 1 |
| Ending Page | 11 |
| Page Count | 11 |
| File Format | PDF HTM / HTML |
| DOI | 10.1016/0039-6028(88)90160-4 |
| Alternate Webpage(s) | http://www.chem.tamu.edu/rgroup/goodman/pdf%20files/096_ss_205_88_1.pdf |
| Alternate Webpage(s) | https://doi.org/10.1016/0039-6028%2888%2990160-4 |
| Volume Number | 205 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
