![](/img/virseliai/0235-7216.jpg) ISSN 0235-7216
ISSN 2424-4538 (online)
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2009 m. Nr. 1
![](/img/pdf_icon.jpg) Formation and study of electrically conductive layers of copper sulfides formed on the polyamide surface by the use of potassium pentathionate
Vitalijus JANICKIS, Remigijus IVANAUSKAS, Rūta STOKIENĖ, Mindaugas ANDRULEVIČIUS
Semiconductive and electrically conductive layers of copper sulfides on the polyamide 6 (PA) surface were formed using the sorption–diffusion method and a water solution of potassium pentathionate, K2S5O6, as a precursor of polymer sulfurization. Pentathionate anions containing chains of divalent sulfur atoms of low oxidation state, –O3S–S–S–S–SO3–, are sorbed-diffused into PA films if they are treated with K2S5O6 solution. The concentration of sorbed sulfur increases with an increase of the temperature and concentration of the precursor solution and the duration of PA treatment. CuxS layers are formed on the surface of PA film when a sulfurized polymer is treated with the water solution of copper(II / I) salt: pentathionate anions react with copper ions. The concentration of copper increases (up to ~40 mg · g–1) with increasing the concentration and temperature of the precursor solution. XRD results confirmed the formation of CuxS layers on the surface of PA. The phase composition of CuxS layer depends on the concentration and temperature of potassium pentathionate solution and on the duration of initial treatment in the K2S5O6 solution. The layers are composed of the low-conductive tetragonal chalcocite, Cu1.96S, monoclinic djurleite, Cu1.9375S, electrically conductive rhomhedral digenite, Cu9S5, orthorhombic anilite, Cu7S4, and cubic CuS2. The phase composition determines the electrical characteristics of the layers obtained: the sheet resistance varies from 0.104 to 1.52 · 103 KΩ / □. X-ray photoelectron spectroscopy confirmed formation of copper sulfides of various phases. The regularities established in the present work enable formation of CuxS layers of a desirable composition and conductivity.
Keywords: potassium pentathionate, polyamide, copper sulfide layer
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