Structured surfaces of wide band gap insulators as templates for overgrowth of adsorbates

Bennewitz, Roland

doi:10.1088/0953-8984/18/26/r01

Cited by 31 publications

(24 citation statements)

References 148 publications

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“…Adsorption of atomically thin NaCl layers has been studied for several metal surfaces (see Refs. [18][19][20][21]. It was found to retain its ionic structure, the charges influencing the adsorption structure in the case of vicinal surfaces.…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of the electronic excited states in ultrathin ionic layers supported on metal surfaces: NaCl/Cu(111)

2011

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We present a theoretical study of the electronic excited states in ultrathin ionic layers supported on metal surfaces. We have studied 1, 2, 3, and 4 monolayers of NaCl on a Cu(111) surface. Energies, lifetimes, and associated wave functions of the excited states have been obtained with a joint, model potential-wave packet propagation approach. The excited state with the lowest energy has the character of an image potential state repelled from the surface by the NaCl layer. The next two states present a mixed character of image potential states and NaCl layer states corresponding to the quantization of the conduction band in the finite-size layer. We discuss the role of the layer thickness in decoupling these states from the metal surface and how it affects their lifetime.

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Section: Introductionmentioning

confidence: 99%

Theoretical study of the electronic excited states in ultrathin ionic layers supported on metal surfaces: NaCl/Cu(111)

2011

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“…In many fundamental research fields, notably in surface science [1], they serve as model templates and atomically controlled spacers, for the manipulation and study of nanoparticles [2][3][4], molecules [5][6][7][8][9][10], or single atoms [11]. Most of the time, chemical stability of insulating thin films upon charged particle irradiation is required, e.g., for characterization using electron spectroscopy and microscopy.…”

Section: Introductionmentioning

confidence: 99%

Reaction kinetics of ultrathin NaCl films on Ag(001) upon electron irradiation

et al. 2017

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We report on an electron-induced modification of alkali halides in the ultrathin film regime. The reaction kinetics and products of the modifications are investigated in the case of NaCl films grown on Ag(001). Their structural and chemical modification upon irradiation with electrons of energy 52-60 eV and 3 keV is studied using low-energy electron diffraction (LEED) and Auger electron spectroscopy (AES), respectively. The irradiation effects on the film geometry and thickness (ranging from between two and five atomic layers) are examined using scanning tunneling microscopy (STM). We observe that Cl depletion follows different reaction kinetics, as compared to previous studies on NaCl thick films and bulk crystals. Na atoms produced from NaCl dissociation diffuse to bare areas of the Ag(001) surface, where they form Na-Ag superstructures that are known for the Na/Ag(001) system. The modification of the film is shown to proceed through two processes, which are interpreted as a fast disordering of the film with removal of NaCl from the island edges and a slow decrease of the structural order in the NaCl with formation of holes due to Cl depletion. The kinetics of the Na-Ag superstructure growth is explained by the limited diffusion on the irradiated surface, due to aggregation of disordered NaCl molecules at the substrate step edges.

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“…Ultrathin films of insulators, such as layers of metal oxides or alkaline halides that are a few atoms thick and grown on conducting substrates retain enough of their insulating properties to act as separators. [3,4] At the same time, these films are thin enough to ensure for sufficient electron tunneling and thus for imaging of single atoms and molecules by scanning tunneling microscopy (STM). NaCl turns out to be a suitable insulating material; it already exhibits a large band gap as a bilayer, [5,6] which grows on various metal surfaces [7][8][9][10][11][12][13][14][15][16][17] in a flat and very homogeneous manner with a low number of defects.…”

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confidence: 99%

Single Molecular Wires Connecting Metallic and Insulating Surface Areas

et al. 2009

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Totally wired: A particular molecular adsorption geometry can be prepared by adsorbing single conjugated polyfluorene chains partially on a clean Au(111) surface and partially on a thin crystalline NaCl film, thus connecting metallic and insulating surface areas. This configuration allows the electronic characterization of one and the same molecular wire as a function of its atomic-scale environment in a planar configuration

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Structured surfaces of wide band gap insulators as templates for overgrowth of adsorbates

Cited by 31 publications

References 148 publications

Theoretical study of the electronic excited states in ultrathin ionic layers supported on metal surfaces: NaCl/Cu(111)

Theoretical study of the electronic excited states in ultrathin ionic layers supported on metal surfaces: NaCl/Cu(111)

Reaction kinetics of ultrathin NaCl films on Ag(001) upon electron irradiation

Single Molecular Wires Connecting Metallic and Insulating Surface Areas

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