In Situ Electrochemical Quartz Crystal Microbalance Study of Potential Oscillations During the Electrodeposition of Cu/Cu₂O Layered Nanostructures

Abstract

Application of a constant cathodic current to an electrode in an alkaline Cu(II) lactate solution results in oscillation of the electrode potential during the electrodeposition of copper/cuprous oxide layered nanostructures. The electrochemical quartz crystal microbalance (EQCM) is used for in situ phase analysis measurements of the nanoscale layers and the results are compared with bulk XRD measurements. The EQCM is also used to estimate the layer thicknesses and overall modulation wavelength of the nanostructures. We propose that Cu2U is deposited during the positive spikes in electrode potential, while a composite of Cu and Cu2U is deposited during the more negative plateau region of the oscillation. The modulation wavelength calculated from the EQCM is in good agreement with that observed with scanning electron microscopy. The EQCM is shown to be a useful tool for estimating layer thicknesses and phase compositions for layers that are too thin to be examined by other instrumental techniques.

Department(s)

Chemistry

International Standard Serial Number (ISSN)

0743-7463

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1999 American Chemical Society (ACS), All rights reserved.

Publication Date

01 Feb 1999

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