Jorge O. Zerbino
National University of La Plata
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Publication
Featured researches published by Jorge O. Zerbino.
Journal of Electroanalytical Chemistry | 2002
Jorge O. Zerbino; A.M. Castro Luna; C.F. Zinola; Eduardo Méndez; M.E. Martins
Films obtained after cathodic polarization at Ec, −0.2 V≤Ec≤0.1 V (vs. RHE), in aqueous acid perrhenate have been investigated using cyclic voltammetry and ellipsometry. The thickness and optical indices corresponding to the electrodeposited rhenium layer were calculated. The results indicate the formation of a composite layer, with a volumetric fraction of about 30% of metallic rhenium and hydrogen occlusion.
Journal of the Brazilian Chemical Society | 2002
Jorge O. Zerbino; Ana M. Castro Luna; C.F. Zinola; Eduardo Méndez; M.E. Martins
Rhenium-containing films were grown on gold and platinum after different potentiostatic and potentiodynamic polarizations in the - 0.20 V to 0.70 V range (vs rhe) in aqueous acid perrhenate. Experimental data were obtained using cyclic voltammetry and ellipsometry, from which the thickness and optical indices of the electrodeposited rhenium layer were calculated. Metallic rhenium deposition on gold takes place at potentials within the hydrogen evolution reaction. Rhenium oxide on platinum is formed in the hydrogen adatom potential domain, whereas metallic rhenium is deposited concurrently with the hydrogen adsorption and evolution reactions on the same metal.
Journal of Colloid and Interface Science | 2003
R.M Torres Sánchez; A.M. Castro Luna; Jorge O. Zerbino
The influence of CO on the passive behavior of copper was analyzed in the potential region near the rest potential in borax solutions (pH 9.2) by cyclic voltammetry, ellipsometry, and surface charge determination techniques. The oxide formation is explained as a sequence of Cu(2)O growth, cation adsorption, Cu(II), and dissolution steps, similarly to previously reported investigations for the metal in free CO solutions. The CO adsorption hinders the cationic defect in the outer oxide layer and accelerates the Cu(2)O growth both at open circuit and in controlled potential experiments. The isoelectric point, iep, obtained at pH 10.8 for both the metal Cu and CuO particles in KCl solutions shifts to pH 10.1 for copper particles in the presence of CO. The iep indicates a CuO coating on Cu metallic particles in the absence of CO.
arXiv: Optics | 2017
Víctor Toranzos; Guillermo P. Ortiz; W. Luis Mochan; Jorge O. Zerbino
We study the optical and electrical properties of silver films with a graded thickness obtained through metallic evaporation in vacuum on a tilted substrate to evaluate their use as semitransparent electrical contacts. We measure their ellipsometric coefficients, optical transmissions and electrical conductivity for different widths, and we employ an efficient recursive method to calculate their macroscopic dielectric function, their optical properties and their microscopic electric fields. The topology of very thin films corresponds to disconnected islands, while very wide films are simply connected. For intermediate widths the film becomes semicontinuous, multiply connected, and its microscopic electric field develops hotspots at optical resonances which appear near the percolation threshold of the conducting phase, yielding large ohmic losses that increase the absorptance above that of a corresponding homogeneous film. Optimizing the thickness of the film to maximize its transmittance above the percolation threshold of the conductive phase we obtained a film with transmittance T = 0.41 and a sheet resistance
International journal of electrochemistry | 2011
Jorge O. Zerbino; María G. Sustersic; Claudio Falivene; N. Avaca; Alberto Maltz
R_{\square}^{\mathrm{max}}\approx2.7\Omega
Portugaliae Electrochimica Acta | 2004
L.M. Gassa; A.M. Castro Luna; R.M Torres Sánchez; Jorge O. Zerbino
. We also analyze the observed emission frequency shift of porous silicon electroluminescent devices when Ag films are used as solid electrical contacts in replacement of electrolytic ones.
Acta Chimica Slovenica | 2009
Jorge O. Zerbino; Rosa M. Torres Sánchez; Marija G. Sustersic
The growth of polypyrrole (Ppy) layers on gold electrodes in nearly neutral pH solutions is analysed using “in situ” voltametric and ellipsometric techniques. Different film structures are obtained depending on the potentiodynamic programme and the composition of the electrolyte. More compact dodecylsulphate-(DS) doped Ppy layers were grown at 1.2 V versus RHE than those obtained by applying a higher potential. The more compact layers correspond to the growth of an oxidised Ppy/DS layer that shows low pseudo capacity behaviour. After dipping, the doped Ppy/DS film in KCl solution-significant variations in optical indices and thickness are detected as a function of the applied potential. Higher electrochromism as well as decrease in film thickness after cathodisation is achieved. The optical indices and the thickness of the Ppy layer formed under different applied potential/time programmes are estimated.
Avances en Ciencias e Ingeniería | 2010
Jorge O. Zerbino; Claudio Falivene; Alberto Maltz; María G. Sustersic
Avances en Ciencias e Ingeniería | 2017
Ricardo I. Tucceri; Claudio Falivene; Jorge O. Zerbino
Archive | 2014
Víctor Toranzos; Jorge O. Zerbino; Alberto Maltz; Guillermo P. Ortiz