Preparation of cuxS Coatings on Polyethylene Foils by Thiourea and Cu (I-II) Salt Solutions

Almantas Danilevicius,a Stanislovas Grevys,b Juozas Vidas Grazulevicius,a* and Violeta Grazulevicienec
Department of Organic Technology, Kaunas University of Technology, Radvilėnu pl. 19, LT-50254 Kaunas, Lithuania,

Department of General Chemistry, Kaunas University of Technology, Radvilėnu pl. 19, LT-50254 Kaunas, Lithuania
Department of Chemistry, Lithuanian University of Agriculture, Studentu g. 11, LT-4324, Akademija, Kauno r. Lithuania

The structure of CuxS layers, deposited by sorption-diffusion method, on polyethylene (PE) foils was studied. For the preparation of these layers PE samples were treated in the saturated solution thiourea containing an additive such as potassium persulfate in an acid medium. The sulfurized PE samples containing mainly S6 and S8 modifications were later treated with the aqueous solution of Cu (I-II) salt containing hydroquinone as a reducing agent. The value of x in the CuxS layer formed determined by the X-ray analysis ranged from 1 to 2. These layers contained mainly yarrowite Cu1.13S, digenite Cu1.8S and chalcosine Cu2S. The X-ray diffraction studies showed that the non-stoichiometric Cu1.13S was formed at the beginning of the formation of CuxS layer and its composition approached to Cu2S, when the duration of sulfured PE interaction with the solution of Cu (I-II) salt increased. The obtained CuxS layersof the thickness up to 50 mm showed sheet resistance of ca. 20 W. 

Key words: polyethylene, copper sulfide coatings, diffusion, sorption, sheet resistance