| Autor: |
Gregory Cabailh, Claude R Henry, Clemens Barth |
| Jazyk: |
angličtina |
| Rok vydání: |
2012 |
| Předmět: |
|
| Zdroj: |
New Journal of Physics, Vol 14, Iss 10, p 103037 (2012) |
| Druh dokumentu: |
article |
| ISSN: |
1367-2630 |
| DOI: |
10.1088/1367-2630/14/10/103037 |
| Popis: |
The surface work function (WF) and substrate temperature dependence of the NaCl thin-film growth on Ag(001) have been studied by noncontact atomic force microscopy and Kelvin probe force microscopy. In the sub-monolayer range, the NaCl film is composed of large crystalline islands, which decrease in density and increase in size with increasing temperature during deposition. Each island is composed of a large base island 2 monolayers (ML) thick (for T > 343 K), which collects impinging NaCl molecules that form ad-islands on top. Kelvin probe force microscopy (KPFM) measurements show a reduction of the silver WF by $\Delta \varphi =\varphi _{\mathrm {Ag}}-\varphi _{\mathrm {NaCl/Ag}}=0.69\pm 0.03\, \mathrm {eV}$ with no dependence on the film thickness (1–6 ML), in agreement with recent theoretical calculations. The previously observed nanometer-sized moiré pattern on islands that are 45° rotated with respect to the silver lattice could be observed in the scanning tunneling microscopy mode. However, no contrast could be obtained in KPFM images. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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