Zinc-oxide nanowires electrochemically grown onto sol-gel spin-coated seed layers

The electrochemical deposition of ZnO nanowires (NW) was optimized by growing onto a previously deposited seed layer. The ZnO seed layer was prepared by a sol–gel process from different precursor solutions and deposited onto FTO/glass by spin coating. Afterwards, NW were electrochemically grown onto...

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Bibliographic Details
Published in:	Physica status solidi. A, Applications and materials science Vol. 208; no. 7; pp. 1662 - 1669
Main Authors:	Bojorge, Claudia D., Kent, Vladimir R., Teliz, Erika, Cánepa, Horacio R., Henríquez, Rodrigo, Gómez, Humberto, Marotti, Ricardo E., Dalchiele, Enrique A.
Format:	Journal Article
Language:	English
Published:	Berlin WILEY-VCH Verlag 01-07-2011 WILEY‐VCH Verlag Wiley-VCH
Subjects:	Chemical synthesis methods Condensed matter: electronic structure, electrical, magnetic, and optical properties Cross-disciplinary physics: materials science; rheology electrochemical deposition Exact sciences and technology Materials science Methods of nanofabrication Nanocrystals and nanoparticles Nanoscale materials and structures: fabrication and characterization nanostructures nanowires Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures Physics Quantum wires transmittance spectra ZnO Scanning electron microscopy Particle size XRD Absorption coefficients Aqueous solutions Wurtzite structure Electrodeposition Zinc oxide Spin-on coating Urbach rule Nanowires Absorption spectra Microstructure Sol-gel process Nanomaterial synthesis
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Summary:	The electrochemical deposition of ZnO nanowires (NW) was optimized by growing onto a previously deposited seed layer. The ZnO seed layer was prepared by a sol–gel process from different precursor solutions and deposited onto FTO/glass by spin coating. Afterwards, NW were electrochemically grown onto those seed layers. The electrolyte was an aqueous solution of the Zn+2 precursor (1 mM zinc acetate) and a supporting electrolyte (0.1 M sodium acetate), saturated with bubbling oxygen. The films were characterized by X‐ray diffraction (XRD), scanning electron microscopy (SEM), and optical transmittance. The XRD measurements show typical diffraction pattern of ZnO wurtzite structure. The SEM micrographs show the presence of smooth NW with hexagonal sections with diameters ranging from 40 to 250 nm. The optical transmittance reveals the presence of ZnO with bandgap energy between 3.23 and 3.29 eV. These spectra show a monotonically increasing transmittance from the UV into the red part of the spectrum. This feature may be originated in the dispersion of light at the NW and can be used to enhance below‐gap absorption.
Bibliography:	ArticleID:PSSA201026752 istex:8EE40993206C1E463C8611D467B3CD2B123234A4 ark:/67375/WNG-VXTKW27H-R
ISSN:	1862-6300 1862-6319
DOI:	10.1002/pssa.201026752