Properly interpreting scanning tunneling microscopy images: the Cu()-c(2×2)N surface revisited

Wofford, T.E.; York, Scott; Leibsle, F.M.

doi:10.1016/s0039-6028(02)02249-5

Cited by 21 publications

(2 citation statements)

References 26 publications

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“…Further examinination of a vertical cross section of the electrostatic potential along the dimer axis (Figure 2f) illustrates how the intermediate missing row distorts the valence electron orbitals of the oxygen atoms, leading to the dimer-like charge density. As shown by Wofford et al, 40 the…”

Section: Resultsmentioning

confidence: 74%

Standardization of Chemically Selective Atomic Force Microscopy for Metal Oxide Surfaces

Wiesener,

Förster,

Merkel

et al. 2024

ACS Nano

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The structures of metal oxide surfaces and inherent defects are vital for a variety of applications in materials science and chemistry. While scanning probe microscopy can reveal atomic-scale details, elemental discrimination usually requires indirect assumptions and extensive theoretical modeling. Here, atomic force microscopy with Oterminated copper tips on a variety of sample systems demonstrates not only a clear and universal chemical contrast but also immediate access to the atomic configuration of defects. The chemically selective contrast is explained by purely electrostatic interactions between the negatively charged tip-apex and the strongly varying electrostatic potential of metal and oxygen sites. These results offer a standardized methodology for the direct characterization of even the most complex metal oxide surfaces, providing fundamental insight into atomic-scale processes in these material systems.

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Section: Resultsmentioning

confidence: 74%

Standardization of Chemically Selective Atomic Force Microscopy for Metal Oxide Surfaces

Wiesener,

Förster,

Merkel

et al. 2024

ACS Nano

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“…Thus, the lingering issue of this system has been the structure of the first layer Cu atoms and the interpretation of its STM images. While it was proposed that the bright spots in the STM images may be just distortions, not the image of Cu atoms that can be caused by the STM tip with an asymmetric apex [28], recently simulated STM images showed that the bright spots were N atoms. As interpretation of STM measurements may not be unique, calculations of surface stress and surface phonon dispersion provide alternate ways of verifying these conclusions.…”

Section: Adsorbate Induced Stress On Ni(001) and Cu(001)mentioning

confidence: 99%

Adsorbate induced changes in surface stress and phonon dispersion curves of chemisorbed systems

Hong¹,

Rahman

2008

J. Phys.: Condens. Matter

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We present a summary of theoretical results documenting changes in surface stress and surface phonon frequencies for selected light gas adsorbates on Ni(001) and Cu(001) which, when compared with experimental data, provide critical information on surface geometry and electronic structure. Our calculations of the surface electronic structure are based on density functional theory, using the pseudopotential method, while the evaluation of surface dynamics relies on the density functional perturbation theory. A c(2 × 2) overlayer of C on Ni(001) and of N on Cu(001), causes a large change in the surface stress (≈5 N m −1) turning it from tensile to compressive in both cases. We find that while adsorbate induced surface stress change depends on the height at which the adsorbate sits on the surface, it is not a direct measure of the propensity of the substrate to reconstruct. We also consider examples of changes in surface electronic structure, and surface force fields and hence the characteristics of surface phonon dispersion curves, brought about by chemisorption, and compare them with experimental data where available.

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

Komori

Ohno

Nakatsuji

2004

Progress in Surface Science

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Properly interpreting scanning tunneling microscopy images: the Cu()-c(2×2)N surface revisited

Cited by 21 publications

References 26 publications

Standardization of Chemically Selective Atomic Force Microscopy for Metal Oxide Surfaces

Standardization of Chemically Selective Atomic Force Microscopy for Metal Oxide Surfaces

Adsorbate induced changes in surface stress and phonon dispersion curves of chemisorbed systems

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

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