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TitleDirect observation of distinct nucleation and growth processes in electrochemically deposited ZnO nanostructures using in situ XANES
Publication TypeJournal Article
Year of Publication2008
AuthorsIngham, B., Illy B.N., and Ryan M.P.
JournalJournal of Physical Chemistry C
Pagination2820 - 2824
Date Published2008
ISSN19327447 (ISSN)
KeywordsCoalescence, Deposition potentials, Nanorods, Nanostructured materials, Nucleation, Solutions, Transmission measurements, X ray absorption near edge structure spectroscopy, Zinc oxide
AbstractIn situ synchrotron X-ray absorption was used to study the nucleation and growth of ZnO nanostructures electrochemically deposited from aqueous solutions. A fixed-energy approach was used, which facilitates faster time resolution for systems that are not amenable to transmission measurements and where species-specific information has so far been elusive. Films formed at low potentials (-0.97 V vs Ag/AgCl) show instantaneous nucleation, continued growth, and coalescence of the nanorods. The resultant film is dense with narrow dispersion of rod diameters. At less negative deposition potentials (-0.77 V vs Ag/AgCl), the nucleation is more protracted, resulting in a polydispersed film. In this higher potential region, the growth rates are slower, and there is less evidence of coalescence in the deposited structures, with continued growth along the c-axis only. © 2008 American Chemical Society.

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