| Abstract [eng] |
Introduction. Formation of various chemical compounds on films has been recognized for many years. Usage of polymer films with electroconductive layers has been increasing due to their elasticity, resistance against corrosion and low toxicity. Thin film coating of copper sulfide layers is diverse because of various stoichiometries that they form at room temperature: covellite (CuS), spionkopite (Cu1,393S), djurlite (Cu1.9375S) and others. Depending on their stoichiometric configuration and electrical conductivity they can be used as conductors, semiconductors and insulators [1, 2]. Because of these properties they have a promising application in solar control coatings and photovoltaic devices, polarizers or infrared radiation [3], chemical sensors [4], catalysts [5], superconductors [6]. Electrically conductive CuxS layers on polymers can be deposited on the thin film using these methods: vacuum evaporation, active reactive evaporation [7], electroless deposition [8], successive ionic layer adsorption and reaction (SILAR) [1], chemical bath composition [6, 9], sorption-diffusion methods [10]. Using the last-mentioned method, the copper sulfide layers are initially treated by a sulfurization agent: sodium polysulfides [11], polythionic acids and polythionates [12, 13, 14], thiourea solutions [15] and sulfur [16]. In the next step the polymer films are treated with an aqueous Cu (I/II) salt solution [15, 16]. Polypropylene (PP) is a resistant material towards chemicals and various organic and inorganic solvents. This plastic also has good resistance to impact, good dielectric properties, has a high melting point, low density (900 kg/m3). The global consumption of this plastic means that the plastic always has new methods of application. [17] The aim of this study was to form non-stochiometric copper sulfide CuxS coatings on polypropylene (PP) films. Investigation of film color change, X-ray diffraction, water contact angle, UV/VIS, were carried out in this experiment. |
