Nano Archive

Direct observation of distinct nucleation and growth processes in electrochemically deposited ZnO nanostructures using in situ XANES

Ingham, Bridget and Illy, Benoit N. and Ryan, Mary P. (2008) Direct observation of distinct nucleation and growth processes in electrochemically deposited ZnO nanostructures using in situ XANES. JOURNAL OF PHYSICAL CHEMISTRY C, 112 (8). pp. 2820-2824.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp075775%2B

Abstract

In 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.

Item Type:Article
Subjects:Material Science > Nanostructured materials
Analytical Science > Beam methods
ID Code:6145
Deposited By:IoN
Deposited On:05 Aug 2009 13:11
Last Modified:05 Aug 2009 13:11

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