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Laser-induced Dewetting Nanomorphologies in Single and Bilayer Metal Films

Published online by Cambridge University Press:  01 February 2011

Hare Krishna ,
Christopher Favazza ,
R. Sureshkumar  and
R. Kalyanaraman
Hare Krishna
Affiliation:
harek@physics.wustl.edu, Washington University in St. Louis, Physics, 6490, Enright Ave, Apt # 212, St. Louis, MO, 63130, United States
Christopher Favazza
Affiliation:
cfavazza@physics.wustl.edu, Washington University in St. Louis, Department of Physics, St. Louis, MO, 63130, United States
R. Sureshkumar
Affiliation:
suresh@che.wustl.edu, Washington University in St. Louis, Department of Energy, Environmental and Chemical Engineering, St. Louis, MO, 63130, United States
R. Kalyanaraman
Affiliation:
ramkik@wuphys.wustl.edu, Washington University in St. Louis, Department of Physics, St. Louis, MO, 63130, United States
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Abstract

Spatially ordered patterns result under ns laser-induced dewetting of nanoscopic metallic films like Co and Ag on inert substrates like SiO2. In both cases, the observed ordering length scale is due to thin film hydrodynamic instability with spinodal-like character. However, the morphological pathway during dewetting is different for the two metals: occurring through development of bicontinuous structures in the case of Ag and by progression of cellular networks for Co. Dewetting in bilayer structures of Ag and Co on SiO2 show that the morphology evolution is dictated by the thicker of the two films in the bilayer structure. We applied linear stability analysis to predict the length scales in single and bilayer metal film. The experimental observations are in good agreement with theoretical predictions from the analysis. An important result was that the length scales for the bilayer film were significantly smaller than a single layer of the same thickness suggesting that further control of patterning length scales may be achieved through multilayer dewetting.

Keywords

laser-induced reactionnanostructuremorphology
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 960: Symposium N – Self Assembly of Nanostructures Aided by Ion- or Photon-Beam Irradiation—Fundamentals and Applications , 2006 , 0960-N03-02
Copyright
Copyright © Materials Research Society 2007

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References

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