Initial growth of insulating overlayers of NaCl on Ge(100) observed by scanning tunneling microscopy with atomic resolution

Glöckler, K.; Sokołowski, M.; Soukopp, A.; Umbach, E.

doi:10.1103/physrevb.54.7705

Cited by 61 publications

(69 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The growth of ultrathin NaCl films and their properties have been characterized by STM on several metal and semiconductor surfaces such as Ge(1 0 0) [16], Al(1 1 1) and Al(1 0 0) [17], Cu(1 1 1) [18], Cu(2 1 1) [19], Cu(3 1 1) [20], Cu(5 3 2) [21], Ag(1 0 0) and Ag (1,1,19) [22], but to our knowledge no study of the growth of ultrathin NaCl films on Au(1 1 1) has been reported. Before studying the adsorption of molecules on the NaCl layers, we thus investigated the growth of NaCl on Au(1 1 1) and on Au (11 12 12) [for Au (11 12 12), see Section 3.3].…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2009

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

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

et al. 2009

View full text Add to dashboard Cite

show abstract

“…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%

“…Constant current images correspond roughly to surfaces of constant density of states at the Fermi edge. The thickness of insulating layers will appear systematically smaller than geometrically expected, since they provide no electronic states themselves but can only extend states of the substrate [9,11]. In dynamic force microscopy there exists a similar problem.…”

Section: Nacl Films On Metal Surfacesmentioning

confidence: 91%

“…By this means, the geometric island height is well reproduced, and we find that both monolayer and double-layer islands grow directly on the Al(111) surface. The existence of monolayer islands excludes a growth mode exclusively based on NaCl molecules in vertical configuration, as suggested by the growth on Ge(100) where only double-layer islands were found [9].…”

Section: Nacl Films On Metal Surfacesmentioning

confidence: 99%

“…Note that only one type of ion has been imaged as a protrusion. This is always the case for dynamic force and scanning tunneling microscopy alkali halide surfaces [2,9,11,13]. For an interpretation of the atomic contrast in scanning tunneling microscopy, calculations of the local density of states have been performed [11].…”

Section: Nacl Films On Metal Surfacesmentioning

confidence: 99%

See 2 more Smart Citations

Atomic Structure of Alkali Halide Surfaces

Bennewitz

Schär

Gnecco

et al. 2003

Advances in Solid State Physics

View full text Add to dashboard Cite

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

show abstract

Highly Ordered 2D Hydrogen‐Bonded Structures of a Tetralactam Macrocycle on the Au(111) Surface

Kossev

Reckien

Kirchner

et al. 2007

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

Monolayers of a tetralactam macrocycle, which are commonly used as building blocks in the synthesis of rotaxanes or catenanes, are deposited on a Au(111) surface by using vapor deposition. Due to self‐organization, 2D highly ordered supramolecular networks form. From scanning tunneling microscopy (STM) and concomitant density‐function theory calculations, two structurally different phases are found. In both phases, pairs of hydrogen bonds between the amide groups of next‐neighbor macrocycles are responsible for the structural arrangement of the macrocycles. The structure of both phases differs from that of bulk lattice planes, which reveals that the Au(111) surface acts as a template for the growth of the specific 2D structures. These networks of tetralactam macrocycles possibly open a route to study mechanical interlocking processes or guest/host interactions of the molecules in further detail by using STM.

show abstract

Initial growth of insulating overlayers of NaCl on Ge(100) observed by scanning tunneling microscopy with atomic resolution

Cited by 61 publications

References 12 publications

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

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

Atomic Structure of Alkali Halide Surfaces

Highly Ordered 2D Hydrogen‐Bonded Structures of a Tetralactam Macrocycle on the Au(111) Surface

Contact Info

Product

Resources

About