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Structural and optical characterization of SnS thin films by electrodeposition technique

Mariappan R., Ragavendar M., Ponnuswamy V.

Optica Applicata

2011

Vol. 41, nr 4

989--997

SnS thin films were electrodeposited on ITO (indium tin oxide) glass substrates maintained at different temperatures using aqueous solutions containing 33 mM of SnCl2 and 91 mM of Na2S2O3ź5H2O. The films were characterized to study the structural, morphological and optical properties. The X-ray diffraction studies of the films show the polycrystalline nature with orthorhombic crystal structure. Microstructural parameters such as crystallite size, microstrain, and dislocation density were calculated with respect to various temperatures. The scanning electron microscope (SEM) studies reveal good surface morphology with a large number of grains at the optimized temperature. The optical band gap of the SnS film was determined from optical transmittance data, in the spectral range 400-1100 nm and the direct band gap energy (Eg) was found to be 1.2 eV, which does agree well with earlier reported values. Fourier transform infrared spectroscopy (FTIR) studies confirm the presence of SnS films in the molecular structure.

Synthesis and characterisation of thin cerium-based oxide films by celd on zinc metal

Poupard S., Pedraza F., Creus J.

Advances in Materials Science

2007

Vol. 7, nr 2(12)

300-307

The restriction ban of Cr(VI) based treatment to enhance corrosion resistance of Zn and Zn-alloy coatings requires the development of an environmental friendly alternative process. This study is therefore focused into the synthesis of new treatments based on thin cerium oxide (ceria) films through a cathodic electrodeposition (CELD) process. The surface finishing of the Zn substrates, the electrolyte composition and the deposition parameters are systematically studied to obtain uniform thin ceria layers of diverse microstructures and compositions. Among them, the most homogeneous deposits will be immersed in a stirred and aerated 0.5 mol.L-1 NaCl solution in order to examine the protective ability of these thin cerium-based layers through electrochemical measurements.