Study of Formation and Phase Composition of Thallium Selenide Layers on Polycaproamide
Thepolycaproamide PA 6 films were modified with layers of thallium selenide, TlxSey. A two stage process was used to deposit these thinlayers involves: seleniumization in 0.05 mol·dm–3 K2SeS2O6solution of 0.1 mol·dm–3 HCl and 60 oCfollowed by treatment with the solution ofTl2SO4 at 80 °C for 10 min. The atomic absorption spectroscopy and XRD analysis for investigation the layers of TlxSey were used. The amount of selenium and thallium in the layers of TlxSey increases with increasing theduration of polymer seleniumization and varies: thallium from ~ 9.0 to ~ 21.4 mg·g-1and selenium from ~ 17.7 to ~ 56.9 mg·g-1. The results of XRD analysisconfirmed the formation of thallium selenide layers on the surface of polycaproamide 6 films. Three phases of tetragonal thallium selenide, Tl2Se2 (75–880), Tl2Se1.2(75–1007), Tl5Se3 (41–1295) and two phases of monoclinicselenium Se8 (71–528), Se (73–2121) wereidentified. The phase composition oflayers of TlxSe changesdepending on the duration of polymer seleniumization process.
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