Periodic charge-density modulations on graphite near platinum particles

Xhie, J.; Sattler, K.; Müller, Uwe; Venkateswaran, N.; Raina, Gargi

doi:10.1103/physrevb.43.8917

Cited by 100 publications

(58 citation statements)

References 7 publications

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“…These superstructures have been also observed by other authors in the vinicity of defects on HOPG surfaces such as grain boundaries, 22 deposited metal particles, 23,24,25,26,27 or holes made by spattering. 28,29 They are attributed to an interference between incident and scattered electron wave functions.…”

Section: A Two Types Of Superstructuressupporting

confidence: 82%

Scanning tunneling microscopy and spectroscopy of the electronic local density of states of graphite surfaces near monoatomic step edges

et al. 2006

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We measured the electronic local density of states (LDOS) of graphite surfaces near monoatomic step edges, which consist of either the zigzag or armchair edge, with the scanning tunneling microscopy (STM) and spectroscopy (STS) techniques. The STM data reveal that the (and honeycomb superstructures coexist over a length scale of 3−4 nm from both the edges. By comparing with density-functional derived nonorthogonal tight-binding calculations, we show that the coexistence is due to a slight admixing of the two types of edges at the graphite surfaces. In the STS measurements, a clear peak in the LDOS at negative bias voltages from −100 to −20 mV was observed near the zigzag edges, while such a peak was not observed near the armchair edges. We concluded that this peak corresponds to the graphite "edge state" theoretically predicted by Fujita et al. [J. Phys. Soc. Jpn. 65, 1920] with a tight-binding model for graphene ribbons. The existence of the edge state only at the zigzag type edge was also confirmed by our first-principles calculations with different edge terminations.

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Section: A Two Types Of Superstructuressupporting

confidence: 82%

Scanning tunneling microscopy and spectroscopy of the electronic local density of states of graphite surfaces near monoatomic step edges

et al. 2006

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“…The comparison of images presented in figures 2a (ABD) and 2b (CBD) clearly suggests a smaller condensation coefficient in the case of CBD (Fig. 2b) [4,5,14]. These modulations are observed near "defects" on graphite such as steps, vacancies, supported particles or adsorbed molecules.…”

mentioning

confidence: 84%

“…These modulations are observed near "defects" on graphite such as steps, vacancies, supported particles or adsorbed molecules. The observed modulations, often, have a (B/3xB/3)R30° periodicity (if we take the graphite lattice as a reference) and were seen around platinum [5] and palladium particles [4]. Figure 3a presents an atomic resolution image of a group of particles.…”

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confidence: 99%

“…Transmission electron microscopy (TEM) is currently used to characterise these collections of particles and several authors have shown the interest of using scanning tunnelling microscopy (STM) to probe the surface of the particles at the atomic scale (with access to the third dimension) [1 -4], to study the charge density modulations of the graphite around the particles, which is a sign of their interaction with the substrate [3,5], or to try to observe any difference between particles before and after reaction [4,6]. No changes in morphology were observed for palladium particles observed by STM in air and in UHV [2].…”

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confidence: 99%

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Model catalysts obtained by cluster deposition of Palladium onto HOPG. TEM and STM characterisation

Aires

Sautet

Fuchs

et al. 1993

Microsc. Microanal. Microstruct.

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“…Superstructures are frequently observed on graphite surface, particularly in the neighbouring of supported particles [12]. Parts of the STM image in the insert of figure 6a appear reminiscent of these electronic perturbations, for example the typical misorientation [12] -relative to graphite lattice -can be found in the lower part. However there are elements which support the description of part of this image as a Sb layer growing in an organized way.…”

mentioning

confidence: 91%

TEM and STM investigations of Antimony particles deposited on graphite by Molecular Beam Deposition and Low Energy Cluster Beam Deposition

Villeneuve

Porte

Bardotti

et al. 1993

Microsc. Microanal. Microstruct.

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Periodic charge-density modulations on graphite near platinum particles

Cited by 100 publications

References 7 publications

Scanning tunneling microscopy and spectroscopy of the electronic local density of states of graphite surfaces near monoatomic step edges

Scanning tunneling microscopy and spectroscopy of the electronic local density of states of graphite surfaces near monoatomic step edges

Model catalysts obtained by cluster deposition of Palladium onto HOPG. TEM and STM characterisation

TEM and STM investigations of Antimony particles deposited on graphite by Molecular Beam Deposition and Low Energy Cluster Beam Deposition

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