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Title: Smoluchowski ripening of Ag islands on Ag(100)

Abstract

Using scanning tunneling microscopy, we study the post-deposition coarsening of distributions of large, two-dimensional Ag islands on a perfect Ag(100) surface at 295 K. The coarsening process is dominated by diffusion, and subsequent collision and coalescence of these islands. To obtain a comprehensive characterization of the coarsening kinetics, we perform [ital tailored families] of experiments, systematically varying the initial value of the average island size by adjusting the amount of Ag deposited (up to 0.25 ML). Results unambiguously indicate a strong decrease in island diffusivity with increasing island size. An estimate of the size scaling exponent follows from a mean-field Smoluchowski rate equation analysis of experimental data. These rate equations also predict a [ital rapid] depletion in the initial population of smaller islands. This leads to narrowing of the size distribution scaling function from its initial form, which is determined by the process of island nucleation and growth during deposition. However, for later times, a steady increase in the width of this scaling function is predicted, consistent with observed behavior. Finally, we examine the evolution of Ag adlayers on a strained Ag(100) surface, and find significantly enhanced rates for island diffusion and coarsening. [copyright] [ital 1999 American Institute of Physics.]

Authors:
; ;  [1];  [2];  [3]
  1. (Department of Chemistry and Ames Laboratory, Iowa State University, Ames, Iowa 50011 (United States))
  2. (IPRT and Ames Laboratory, Iowa State University, Ames, Iowa 50011 (United States))
  3. (Department of Mathematics and Ames Laboratory, Iowa State University, Ames, Iowa 50011 (United States))
Publication Date:
OSTI Identifier:
6469008
Alternate Identifier(s):
OSTI ID: 6469008
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 111:11; Journal ID: ISSN 0021-9606
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ADSORBENTS; DEPOSITION; DIFFUSION; ISLANDS; NUCLEATION; ROUGHNESS; SCANNING ELECTRON MICROSCOPY; SILVER; SURFACE PROPERTIES; THIN FILMS; ELECTRON MICROSCOPY; ELEMENTS; FILMS; METALS; MICROSCOPY; TRANSITION ELEMENTS 665000* -- Physics of Condensed Matter-- (1992-)

Citation Formats

Stoldt, C.R., Jenks, C.J., Thiel, P.A., Cadilhe, A.M., and Evans, J.W. Smoluchowski ripening of Ag islands on Ag(100). United States: N. p., 1999. Web. doi:10.1063/1.479770.
Stoldt, C.R., Jenks, C.J., Thiel, P.A., Cadilhe, A.M., & Evans, J.W. Smoluchowski ripening of Ag islands on Ag(100). United States. doi:10.1063/1.479770.
Stoldt, C.R., Jenks, C.J., Thiel, P.A., Cadilhe, A.M., and Evans, J.W. Wed . "Smoluchowski ripening of Ag islands on Ag(100)". United States. doi:10.1063/1.479770.
@article{osti_6469008,
title = {Smoluchowski ripening of Ag islands on Ag(100)},
author = {Stoldt, C.R. and Jenks, C.J. and Thiel, P.A. and Cadilhe, A.M. and Evans, J.W.},
abstractNote = {Using scanning tunneling microscopy, we study the post-deposition coarsening of distributions of large, two-dimensional Ag islands on a perfect Ag(100) surface at 295 K. The coarsening process is dominated by diffusion, and subsequent collision and coalescence of these islands. To obtain a comprehensive characterization of the coarsening kinetics, we perform [ital tailored families] of experiments, systematically varying the initial value of the average island size by adjusting the amount of Ag deposited (up to 0.25 ML). Results unambiguously indicate a strong decrease in island diffusivity with increasing island size. An estimate of the size scaling exponent follows from a mean-field Smoluchowski rate equation analysis of experimental data. These rate equations also predict a [ital rapid] depletion in the initial population of smaller islands. This leads to narrowing of the size distribution scaling function from its initial form, which is determined by the process of island nucleation and growth during deposition. However, for later times, a steady increase in the width of this scaling function is predicted, consistent with observed behavior. Finally, we examine the evolution of Ag adlayers on a strained Ag(100) surface, and find significantly enhanced rates for island diffusion and coarsening. [copyright] [ital 1999 American Institute of Physics.]},
doi = {10.1063/1.479770},
journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = ,
volume = 111:11,
place = {United States},
year = {1999},
month = {9}
}