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1 2007

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Preparation and Some Properties of Conductive Copper Sulfide, CuxS, Films Formed on the Polymers Surface by the Use of Polythionic Acids

Ancutiene I., Janickis V., Ivanauskas R., Stokiene R., Kreiveniene N.

Polish Journal of Chemistry

2007

Vol. 81, nr 3

381-391

Films of copper sulfide of varying composition and propertieswere formed on the surface of polyethylene (PE) and polyamide (PA) for the first time by a sorption-diffusion method and the solutions of polythionic acids, H2SnO6 (n = 5-45), as a precursor of the polymers sulfuration at 1-80 graduate C. Hydrophobic polymer PE adsorbs elementary sulfur from H2SnO6 solutions, while semi-hydrophilic polymer PAsorbs polythionate ions from these solutions. The concentration of sulfur sorbed-diffused into PE or PAincreases with the increase of the acid sulfurity, n, the temperature of a solution and the time of a polymer treatment. The sulfured polymer samples were treated with a Cu(I-II) salt solution at 30-80 graduate C. The amount of copper in a CuxS film formed is strongly dependent on the concentration of sulfur in PE or PA. The chemical analysis of the obtained sulfide films showed that a value of x in the CuxS films varies in the interval 1 < x < 2. X-ray diffraction studies of the CuxS films showed seven phases: chalcocite (Cu2S), djurleite (Cu1.9375S), digenite (Cu1.8S), anilite (Cu1.75S), yarrowite (Cu1.12S), and covellite (CuS). The established regularities of the formation of CuxS films on the surface of PE or PA, their chemical and phase composition enable careful choice of the treatment methods, as well as precursors, capable of achieving electrically conductive or semiconductive copper sulfide films.