Layer Growth, Thermal Stability, and Desorption Behavior of Hexaaza-triphenylene-hexacarbonitrile on Ag(111)
| Autor: | Adolf Winkler, Markus Koini, Ingo Salzmann, Tatjana Djuric, Klaus Müllen, Roland Resel, Paul Frank, Ralph Rieger, Norbert Koch |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
Thermal desorption spectroscopy Analytical chemistry Triphenylene Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound General Energy Electron diffraction X-ray photoelectron spectroscopy chemistry Desorption Monolayer Thermal stability Physical and Theoretical Chemistry Layer (electronics) |
| Zdroj: | The Journal of Physical Chemistry C. 114:6650-6657 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | The layer growth, thermal stability, and desorption kinetics of ultrahigh vacuum (UHV)-grown organic discoid molecules (hexaaza-triphenylene-hexacarbonitrile (HATCN)) on Ag(111) have been studied by atomic force microscopy (AFM), thermal desorption spectroscopy (TDS), low-energy electron diffraction (LEED), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). In the initial growth stage (≤0.24 nm mean film thickness) a strongly bonded monolayer of face-on oriented molecules is formed which does not desorb upon heating to 900 K, probably due to the formation of paracyanogen. With increasing film thickness the monolayer of face-on oriented molecules transforms at room temperature into a monolayer built up of edge-on oriented molecules, which saturates at a mean film thickness of around 0.8 nm. This layer partially decomposes during heating, and C2N2 fragments desorb between 650 and 900 K. On the monolayer of standing molecules a second, metastable, layer forms, which saturates at 1.36 nm. Wi... |
| Databáze: | OpenAIRE |
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