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Effect of Current Distribution on Quartz Crystal Microbalance Measurements

Published online by Cambridge University Press:  10 February 2011

James J. Kelly ,
Christopher J. Durning  and
Alan C. West
James J. Kelly
Affiliation:
Department of Chemical Engineering, Materials Science, and Mining Engineering, Columbia University, New York, NY 10027
Christopher J. Durning
Affiliation:
Department of Chemical Engineering, Materials Science, and Mining Engineering, Columbia University, New York, NY 10027
Alan C. West
Affiliation:
Department of Chemical Engineering, Materials Science, and Mining Engineering, Columbia University, New York, NY 10027
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Abstract

Spatially nonuniform electrodeposition can cause discrepancies between predicted and experimentally measured mass loadings on an electrochemical quartz crystal microbalance (EQCM) since the sensitivity of the quartz crystal varies significantly from point to point. These discrepancies can be significant even if the current distribution is nearly uniform. These effects were examined experimentally by varying the conductivity of the electrolyte and the current density during the electrodeposition of copper on an EQCM, effecting changes in the spatial, deposited-mass distribution in a controlled manner. The resulting frequency shifts are in agreement with results predicted by current distribution simulations, validated a posteriori with profilometry measurements. Our results permit determination of the spatial variation of the quartz crystal sensitivity factor or of the current distribution on the EQCM.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 502: Symposium II – In Situ Process Diagnostics & Intelligent Materials Processing , 1997 , 145
Copyright
Copyright © Materials Research Society 1998

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References

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