An ultrahigh vacuum sputter source for<i>in situ</i>deposition of size-selected clusters: Ag on graphite

Schaffner, M.-H.; Jeanneret, J. B.; Patthey, F.; Schneider, W. D.

doi:10.1088/0022-3727/31/22/001

Cited by 30 publications

(23 citation statements)

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“…In previous cluster deposition studies, gold and silver cluster islands were observed on graphite. 11,12 The formation of these islands is explained by a high mobility of the gold clusters on the graphite surface. In the present study a much lower cluster coverage is used.…”

Section: Resultsmentioning

confidence: 99%

Pinning of size-selected gold and nickel nanoclusters on graphite

2005

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Size-selected gold and nickel nanoclusters are of interest from an electronic, catalytic, and biological point of view. These applications require the deposition of the clusters on a surface, and a key challenge is to retain the cluster size. Here controlled energy impact is used to immobilize the size-selected clusters on the graphite surface at room temperature. The threshold energy for pinning of ionized Au N ͑N = 20-100͒ and Ni N ͑N = 10-300͒ clusters, over the impact energy range 350-2000 eV, is shown by scanning tunneling microscopy to scale with the cluster mass. This behavior is consistent with a previous study of silver clusters and demonstrates the more general applicability of the cluster pinning model.

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Section: Resultsmentioning

confidence: 99%

Pinning of size-selected gold and nickel nanoclusters on graphite

2005

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“…Different types of cluster sources [18][19][20][21][22][23][24][25][26] have been developed by several groups in the past. Most of the cluster sources exploit thermal evaporation, laser ablation, ion beam sputtering, magnetron sputtering, or discharges to evaporate the material for cluster production.…”

Section: Introductionmentioning

confidence: 99%

Ultrahigh vacuum cluster deposition source for spectroscopy with synchrotron radiation

Lau

Achleitner

Ehrke

et al. 2005

Review of Scientific Instruments

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A versatile cluster source has been developed for the deposition and investigation of mass selected metal clusters on single crystal substrates under ultrahigh vacuum conditions. The cluster deposition experiment is designed for spectroscopy with synchrotron radiation to probe the properties of mass selected clusters in x-ray absorption, x-ray magnetic circular dichroism, and x-ray photoelectron spectroscopy. The experimental setup consists of three stages, and is based on a sputter source for cluster production, a magnetic dipole field for mass selection, and an ultrahigh vacuum chamber for cluster deposition. With this cluster source, metal clusters of up to 40 atoms per cluster can be produced, mass separated and deposited onto a substrate. In this size range, cluster current densities of 20pAmm−2–10nAmm−2 have been determined experimentally, depending on cluster material and size. For substrate preparation, the experimental chamber is fully equipped with standard surface science tools. Cluster yields are presented for a variety of sputter targets. The capability to produce truly size-selected clusters is demonstrated with mass spectra.

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“…[1][2][3][4][5] Most commonly, model potentials are used to simulate experimental observations. More accurate, but computationally expensive ab initio approaches 6,7 have been attempted on a relatively small scale, especially for the gold-graphite system of interest here.…”

Section: Introductionmentioning

confidence: 99%

Gold adatoms and dimers on relaxed graphite surfaces

et al. 2004

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The interaction of deposited gold adatoms and dimers with multilayer relaxed graphite surfaces is investigated through a density functional approach with numerical orbitals and a relativistic core pseudopotential. The energy landscape for a gold adatom along ͓110͔ agrees with scanning tunneling microscopy observations including the preferred ␤ binding site for adatoms and the mobility difference between silver and gold adatoms. Deposited particles are shown to induce surface deformation and polarization. Static relaxation and dynamic simulations indicate that the energetically preferred binding orientation for a gold dimer is normal rather than parallel to the graphite surface. The dimer response to a simulated scanning tunneling microscopy tip is investigated by molecular dynamics simulations.

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An ultrahigh vacuum sputter source forin situdeposition of size-selected clusters: Ag on graphite

Cited by 30 publications

References 50 publications

Pinning of size-selected gold and nickel nanoclusters on graphite

Pinning of size-selected gold and nickel nanoclusters on graphite

Ultrahigh vacuum cluster deposition source for spectroscopy with synchrotron radiation

Gold adatoms and dimers on relaxed graphite surfaces

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