| Abstract [eng] |
Cadmium sulfide (CdS) as semiconductor often used in solar cells, flat screens, optical device, logical gates [1, 2]. Polypropylene (PP) is a cheap hydrophobic thermoplastic, non-toxic, rigid and widely used [3]. The aim of the experiment is to deposit CdS onto PP thin film (Cd/PP) in order to get the benefits of both materials. PP is resistant to many chemicals, so modification with thin CdS layers requires additional pre-treatment [4]. Firstly, it was washed in ultrasonic bath with acetone and ethanol, and then was treated at 90 °C for 25 min in oxidation solution of H2SO4, H3PO4, and CrO3. CdS thin layers were deposited onto PP film via chemical bath deposition using 3 different 0.5 mol/L cadmium salts solutions (Cd(CH3COO)2, CdCl2, CdSO4) using thiourea as sulfuring agent. Samples were analyzed using UV-Vis Spectroscopy (spectrometer Spectronic® GenesysTM 8, Perkin Elmer) and band gap was determined by using Tauc plot. Band gap values of Cd/PP were found 2.24 eV, 2.34 eV, 2.35 eV using Cd(CH3COO)2, CdCl2, CdSO4 solutions, respectively (Fig.1, a). Band gap of Cd/PP formed using Cd(CH3COO)2 solution increased with increasing treating time: 1 h – 2.09 eV, 2 h – 2.15 eV, 3 h – 2.19 eV, 4 h – 2.22 eV, 5 h – 2.23 eV (Fig.1, b). [...]. |
