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Characterization of electrochemically deposited thin Mo-O-C-Se film layers

Dukstiene N., Tatariskinaite L., Andrulevicius M.

Materials Science Poland

2010

Vol. 28, No. 1

93--103

The paper reports on the composition, morphology and optical properties of thin Mo-O-C-Se film electrodeposited onto SnO2-glass substrate (R = 292 ?/cm2). The composition of films was estimated based on X-ray photoelectron spectroscopy and Fourier transform infrared spectral analysis. Structural elements similar to molybdenum oxides and/or hydroxides, MoSe2, Se and SeO2 were identified on the surface and in the bulk of the electrodeposits. The studies of surface morphology by scanning electron microscopy and atomic force microscopy showed long-sized wires distributed over all the surface. The optical absorption studies revealed the films to be highly absorptive (104? cm-1) with a direct band transition and the bang gap energy of 1.75 eV.

Electrochemical Examination of the Influence of H2SeO3 on Molybdenum Electrodeposition on Tin Oxide Electrode from Aqueous Citrate Electrolyte

Dukstiene N., Tatariskinaite L.

Polish Journal of Chemistry

2006

Vol. 80, nr 10

1715-1729

Cyclic voltammetry and chronoamperometry have been used to evaluate the electrochemical reactions taking place under SnO2/glass electrode polarization in a solution of Na2MoO4, H2SeO3, sodium citrate (C6H5Na3O7) and in solutions consisting of their mixtures. According to our study, the presence of a small concentration ofH2SeO3 in the electrolyte is necessary to induce the reduction ofMoO4 2 ions. Experimental data support an assumption that the reduction ofMoO4 2 ions to molybdenum could occur when selenium nuclei are initially formed on the electrode. Eventually selenium nuclei induce the electrodeposition of molybdenum, giving finally thin Mo–Se film layers. AAS analysis confirms that in the potential interval between –1.0 and –1.2 V, thin films with a Mo/Se atomic ratio 0.63 and 0.57, respectively, are obtained.