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Title: Influence of the spray pyrolysis seeding and growth parameters on the structure and optical properties of ZnO nanorod arrays
Authors: Rodríguez, Juan 
Feuillet, Guy 
Donatini, Fabrice 
Onna, Diego Ariel 
Sanchez, Luis 
Candal, Roberto Jorge 
Marchi, María Claudia 
Aldabe, Sara Alfonsina 
Chandezon, Frédéric 
Issue Date: Feb-2015
Publisher: Elsevier Science BV
Source: Rodríguez, J. et al. (feb 2015) Influence of the spray pyrolysis seeding and growth parameters on the structure and optical properties of ZnO nanorod arrays. En: Materials Chemistry and Physics. Elsevier Science BV. 151, 378-384.
ZnO nanorods (NRs) were grown on fluorine doped tin oxide (FTO) substrates at low temperatures (90 °C) from Zn2+ precursors in alkaline media previously seeded with ZnO nanoparticles. These were deposited onto the FTO substrate heated at 350 °C by spray pyrolysis of a Zn acetate solution in a water ethanol mixture. The structure of seeds was tuned by the ethanol to water ratio, Γ, which controls the solvent evaporation rate of drops impinging the substrate. From a detailed characterization using a combination of scanning electron microscopy, X-ray diffraction, UV-visible absorption and cathodoluminescence spectroscopies, the dependence of the morphology and optical properties of the ZnO NRs on the seeding conditions was demonstrated. NRs grown on seeds deposited from solutions with Γ in the 0.03-0.06 range - i.e. when the surface excess of ethanol in the water-ethanol mixture has a maximum - show thinner average diameters and stacking faults due to the presence of zinc blende domains embedded into an overall wurtzite NR. They furthermore exhibit blue-shifted near band edge emission peak and a high deep level emission in cathodoluminescence. All these findings support the use of spray pyrolysis as a simple and reproducible way to control the seeds deposition, influencing the growth, the structure and the optical properties of the final ZnO NRs.
ISSN: 0254-0584
Rights: info:eu-repo/semantics/restrictedAccess
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