Lattice deformation and strain-dependent atom processes at nitrogen-modified Cu(001) surfaces

Komori, Fumio; Ohno, Shinya; Nakatsuji, Kan

doi:10.1016/j.progsurf.2004.06.002

Cited by 35 publications

(34 citation statements)

References 62 publications

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“…Figure 1͑d͒ compares representative tunneling spectra from a Cu 2 N island and bare Cu, taken in constant height mode. 7,12 At intermediate coverage ͑ϳ0.5 ML͒ ͓Fig. Finite dI / dV ͑ϳ15 pA/ V͒ is observed at low voltage ͉͑V͉ Ͻ 1 V͒, as expected for metallic behavior.…”

Section: A Cu 2 N Morphology and Spectroscopymentioning

confidence: 57%

Tunneling spectroscopy of ultrathin insulating Cu2N films, and single Co adatoms

Choi

Ruggiero

Gupta

2009

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

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Scanning tunneling microscopy is used to characterize the electronic structure of 1 ML films of c(2×2)N∕Cu(100) (i.e., Cu2N). By varying nitrogen coverage, a variety of morphologies are prepared, including (1) isolated ∼25nm2 islands, (2) close-packed arrays of islands, and (3) quasicontinuous monolayer films. In all three regimes, the authors find that Cu2N acts as an insulator, with a band gap that exceeds 4eV. The insulating Cu2N films are used to control the coupling of adsorbed Co atoms to the Cu(100) surface electron density. Tunneling spectroscopy of Co on Cu2N reveals an unoccupied atomic resonance, Kondo effect, and spin-flip excitation. These features depend on binding site within the Cu2N film, and are distinctly different than corresponding spectra for Co on Cu(100).

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Section: A Cu 2 N Morphology and Spectroscopymentioning

confidence: 57%

Tunneling spectroscopy of ultrathin insulating Cu2N films, and single Co adatoms

Choi

Ruggiero

Gupta

2009

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

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“…Selective nucleation on this nanopatterned surface was previously reported for the deposition of various metals and is expected to be a fairly general behavior. 14,15,18 An increase of C 60 coverage to ∼0.28 ML naturally leads to the saturated adsorption of C 60 on clean Cu areas forming a 2D C 60 molecular nanomesh with a single molecular layer height as shown in Figure 2b. This 2D nanomesh follows the grids of the template and thus is highly regular.…”

Section: Resultsmentioning

confidence: 99%

“…The use of surface cues to guide adsorption processes 13 has been demonstrated on a variety of spontaneously nanostructured substrates such as dislocation networks, 6 vicinal surfaces, 7 self-ordered biphase systems, 14,15 and so on. Molecular assembly on crystal surfaces is determined by a delicate balance between adsorbate-adsorbate and adsorbate-substrate interactions.…”

Section: Introductionmentioning

confidence: 99%

Fullerene on Nitrogen-Adsorbed Cu(001) Nanopatterned Surfaces: From Preferential Nucleation to Layer-by-Layer Growth

et al. 2008

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Nitrogen (N)-adsorbed Cu(001)-c(2 × 2) nanopatterned surfaces are used as templates to guide the growth of low-dimensional C 60 molecular nanostructures. At room temperature and during the initial stages of growth, C 60 molecules preferentially adsorb on the bare Cu regions on a partially N-covered grid surface. Subsequently, a two-dimensional molecular nanomesh is formed at low (∼0.28 monatomic layer) C 60 coverages. Further deposition leads to C 60 growth on the c(2 × 2)-N surface until the first molecular layer is completed. For a N-saturated surface with trench structures, the <010> steps of these structures serve as initial anchoring sites for C 60 growth. From there, the growth proceeds two-dimensionally until a single C 60 layer is achieved due to island coalescence. In contrast, no nucleation site was observed when the <110> steps were predominant on the surface. At least up to 6 monatomic layers, the growth proceeds layer-by-layer (i.e., the overlayer morphologies are directed by the underlying substrate pattern). Four rotational domains are observed for the quasi-hexagonally close-packed C 60 overlayer with a nearest-neighbor C 60 -C 60 distance of 1.02 nm. It was found that the interaction between C 60 and the c(2 × 2)-N surface is fairly weak, likely dominated by van der Waals forces, whereas the C 60 -Cu interface is chemisorbed. Site-specific electronic effects between these two regions can be resolved by STM even for thick films.

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“…Surface stress and its effects (on both bare and adsorbed surfaces) are discussed widely in literatures [7][8][9][10]. Among self-organized nanopatterns, a gridlike pattern on nitrogen(N)-adsorbed Cu(001) has been attracting a lot of attention [3,[11][12][13][14][15][16]. Nitrogen atoms occupy 4-fold hollow sites on a Cu(001) surface in c(2 × 2) arrangement.…”

Section: Introductionmentioning

confidence: 99%

Ribbon-Like Nanopattern Formed on Nitrogen-Adsorbed Vicinal Cu(001)

Yamada

Kawamura

Nakatsuji

et al. 2016

e-J. Surf. Sci. Nanotech.

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Scanning tunneling microscopy investigation is performed on a nitrogen(N)-adsorbed Cu(001) surface. Gridlike nanopattern of 4-fold symmetry is well-known on N/Cu(001), where square N-islands of the size, ca. 5 nm × 5 nm, are aligned along both [100] and [010] directions. We find for the first time a ribbon-like nanopattern in a region vicinal toward [100] with a long-annealed specimen. In the vicinal region, parallel steps run along [010], and each (001) terrace is so narrow as to accommodate only a single N-island in width. These N-islands are aligned perpendicular to the steps, resulting in a ribbon pattern. Closely-spaced parallel steps lower surface symmetry locally from 4-fold to mirror. We ascribe the ribbon pattern to the lowered symmetry. N-islands in the ribbon are changed to rectangles, in marked contrast with squares in the grid. We discuss the square-to-rectangle deformation by considering the shearing strain between the topmost N-adsorbed layer and the second Cu layer.

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Lattice deformation and strain-dependent atom processes at nitrogen-modified Cu(001) surfaces

Cited by 35 publications

References 62 publications

Tunneling spectroscopy of ultrathin insulating Cu2N films, and single Co adatoms

Tunneling spectroscopy of ultrathin insulating Cu2N films, and single Co adatoms

Fullerene on Nitrogen-Adsorbed Cu(001) Nanopatterned Surfaces: From Preferential Nucleation to Layer-by-Layer Growth

Ribbon-Like Nanopattern Formed on Nitrogen-Adsorbed Vicinal Cu(001)

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