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Title: Growth modes of thin films of ligand-free metal clusters

Size-selected Mo{sub n}{sup −}, W{sub n}{sup −}, and Fe{sub n}{sup −} cluster anions are deposited on a weakly interacting substrate (highly oriented pyrolytic graphite) and studied ex-situ using atomic force microscopy. Depending on size, three growth modes can be distinguished. Very small clusters consisting of less than 10–30 atoms behave similar to atoms and coalesce into 3-dimensional bulk-like islands. Medium sized clusters consisting of hundreds of atoms do not coalesce and follow a Stanski-Krastanov growth pattern. At low coverage, an almost perfect monolayer is formed. This is a new finding different from all previous studies on deposited metal clusters. For clusters with several thousands of atoms, the growth pattern again changes. At low coverage, the substrate is dotted with individual clusters, while at high coverage, the surface becomes extremely rough.
Authors:
; ; ; ;  [1] ; ; ;  [2] ;  [3]
  1. Department of Physics, University of Konstanz, Konstanz (Germany)
  2. Departments of Chemistry and Materials Science, Johns Hopkins University, Baltimore, Maryland MD 21218 (United States)
  3. Department of Chemistry, Sungkyunkwan University, 440-746 Suwon (Korea, Republic of)
Publication Date:
OSTI Identifier:
22410229
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 19; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANIONS; ATOMIC CLUSTERS; ATOMIC FORCE MICROSCOPY; GRAPHITE; IRON; LIGANDS; MOLYBDENUM; SUBSTRATES; SURFACES; THIN FILMS; THREE-DIMENSIONAL LATTICES; TUNGSTEN