Morphology of thin NaCl films grown epitaxially on Ge(100)

Schwennicke, C.; Schimmelpfennig, J.; Pfnür, H.

doi:10.1016/0039-6028(93)90243-d

Cited by 71 publications

(41 citation statements)

References 12 publications

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“…Electron diffraction and scanning tunneling microscopy experiments have revealed that monatomic steps on a Ge(100) substrate are overgrown by a continuous NaCl film in a carpet-like mode, due to the internal cohesion of the film being much stronger than the interaction with the substrate [8,9]. This growth mode has been confirmed for the Cu(111) surface by dynamic force microscopy experiments.…”

Section: Nacl Films On Metal Surfacesmentioning

confidence: 51%

Atomic structure of alkali halide surfaces

et al. 2004

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The atomic structure of surfaces of alkali halide crystals has been revealed by means of high-resolution dynamic force microscopy. True atomic resolution is demonstrated both on steps surrounding islands or pits, and on a chemically mixed crystal. We have directly observed the enhanced interaction at low-coordinated sites by force microscopy. The growth of NaCl films on metal surfaces and radiation damage in a KBr surface is discussed based on force microscopy results. The damping of the tip oscillation in dynamic force microscopy might provide insight into dissipation processes on the atomic scale. Finally, we present atomically resolved images of wear debris found after scratching a KBr surface.PACS 68.37.Ps; 75.55.Fv

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Section: Nacl Films On Metal Surfacesmentioning

confidence: 51%

Atomic structure of alkali halide surfaces

et al. 2004

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“…The most interesting aspect of this growth behaviour is that the presence of steps does not lead to dislocations and therefore one NaCl island crosses several steps while staying a single crystallographic domain. This well-known carpet-like overgrowth of steps, kinks, and defects [24] is due to strong internal cohesion of the film, which avoids misfit dislocations in the NaCl layer (see Fig. 2b, where a dashed grey line indicates the estimated step edge position).…”

Section: Resultsmentioning

confidence: 94%

“…4c). This interpretation is not only deduced from the analysis of line profiles À the apparent heights are (2.0 ± 0.2) Å and (3.0 ± 0.2) Å for 1 and 2 ML islands, respectively À but also from the observation of two distinct Calculations of the local density of states attribute the protrusions observed by STM to the Cl À anions [24], as indicated by the superposed model. (c) NaCl crystal structure and schemes defining polar and apolar axes, as well as polar and apolar 1 ML and 2 ML NaCl island edges.…”

Section: Growth Of Nacl On the Vicinal Aumentioning

confidence: 83%

Stabilization of bimolecular islands on ultrathin NaCl films by a vicinal substrate

et al. 2009

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a b s t r a c tThe structure of ultrathin NaCl films on Au(1 1 1) and on Au(11 12 12), as well as the one of bimolecular 3,4,9,10-perylenetetracarboxylic diimide (PTCDI) and 1,4-bis-(2,4-diamino-1,3,5,-triazine)-benzene (BDATB) islands on NaCl films on both surfaces have been studied with a low-temperature scanning tunnelling microscope. We show that intermixed bimolecular assemblies based on selective three-fold hydrogen-bonding (H-bonding), that have previously been observed on Au(1 1 1) and on Au(11 12 12), can also be stabilized on insulating NaCl films on Au, however, only if these films are grown on Au(11 12 12) and not on Au(1 1 1). The behaviour of the heterocomplex structures is found to be largely influenced by the structural properties of the underlying substrate and by the number of NaCl layers. On a partly NaCl-covered Au(1 1 1) surface, the excess of molecules after completion of the first layer on Au prefers to form a second molecular layer based on ordered heterocomplex structures rather than to adsorb on the NaCl islands. The use of a vicinal surface together with the strong cohesion characteristic of the NaCl film introduces smooth elastic deformations on the NaCl(0 0 1) plane. As a consequence, the periodically modified structure of the overlayer provides preferential binding sites and allows adsorption of two-dimensional molecular structures. In contrast to what is observed on Au(11 12 12), the molecular domains on the NaCl film do not follow the Au step directions, but the NaCl(0 0 1) high symmetry directions. Our results provide a strategy to increase the adsorption energy of flat molecules on insulating layers by choosing a vicinal metal substrate.

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“…On top of the initial double layer, islands of additional layers are formed. Substrate defect steps are smoothly overgrown in the so-called carpetlike growth [15]. Because of the different symmetries of NaCl(100) and Cu(111), the growth is incommensurate.…”

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confidence: 99%

Snell’s Law for Surface Electrons: Refraction of an Electron Gas Imaged in Real Space

2004

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On NaCl(100)/Cu(111) an interface state band is observed that descends from the surface-state band of the clean copper surface. This band exhibits a Moiré-pattern-induced one-dimensional band gap, which is accompanied by strong standing-wave patterns, as revealed in low-temperature scanning tunneling microscopy images. At NaCl island step edges, one can directly see the refraction of these standing waves, which obey Snell's refraction law.

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Morphology of thin NaCl films grown epitaxially on Ge(100)

Cited by 71 publications

References 12 publications

Atomic structure of alkali halide surfaces

Atomic structure of alkali halide surfaces

Stabilization of bimolecular islands on ultrathin NaCl films by a vicinal substrate

Snell’s Law for Surface Electrons: Refraction of an Electron Gas Imaged in Real Space

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