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Fabrication of Nanoporous Ceramic Thin Films: De-alloying and Self-organized Template Formation Onamorphous Substrates

Published online by Cambridge University Press:  31 January 2011

Maggie Paulose ,
Oomman K. Varghese  and
Craig A. Grimes
Maggie Paulose
Affiliation:
Department of Electrical Engineering & Materials Research Institute, 208 Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
Oomman K. Varghese
Affiliation:
Department of Materials Science & Engineering, The Pennsylvania State University,University Park, Pennsylvania 16802
Craig A. Grimes
Affiliation:
Department of Electrical Engineering & Materials Research Institute, 208 Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
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Abstract

Sol-gel-derived metal oxide ceramic thin films deposited onto amorphous iron-rich substrates were found to form self-organized nanoporous structures dependent upon the extent to which the substrate is de-alloyed, a function of the substrate alloycomposition, acid concentration of the sol, and film drying conditions. Field emission scanning electron microscopy, transmission electron microscopy, and x-ray energy dispersive analysis were used to investigate details of the porous structure formation.Our studies showed the more electrochemically active elements in the amorphous substrate are de-alloyed by the sol in high-humidity environments, whereupon the liberated elements form oxides replicating the de-alloyed substrate matrix resulting in athree dimensional porous network structure.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 1 , January 2002 , pp. 115 - 126
Copyright
Copyright © Materials Research Society 2002

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