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Measuring the critical thickness of thin metalorganic precursor films

Published online by Cambridge University Press:  31 January 2011

Ryan K. Roeder
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907-1289
Elliott B. Slamovich
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907-1289
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Abstract

Successful application of sol-gel, metalorganic decomposition, or hydrothermal routes to ceramic thin films depends on the mechanical integrity of the precursor film. Above a critical thickness, a precursor film will crack or decohere from the substrate during drying. The cracking and thickness of thin metalorganic precursor films were simultaneously observed during drying using a standard optical microscope. Isochromatic color fringes produced by interference of reflected white light were used to monitor film thickness. The critical film thickness was determined by the color fringe corresponding to the thickness at which propagating cracks terminated. As a demonstration of the technique, the critical thickness of titanium di(isopropoxide) bis(ethyl acetoacetate) films was measured, showing increased critical thickness with the addition of small amounts of an elastomeric polymer.

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Articles
Copyright
Copyright © Materials Research Society 1999

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