Formation of Thallium Sulphide Layers on Polyethylene (PE) Sulphurised in a Solution of Higher Polythionic Acid

摘要

Thallium sulphide layers of different composition were obtained on the surface of polyethylene when it was sulphurised in a solution of higher polythionic acid, H_2S_(33)O_6, and then treated with an alkaline solution of thallium(I) sulphate. The stoichiometric composition of the thallium sulphide layers varied between Tl_(0.3)S and Tl_(2.6)S depending on the formation conditions of the layers of Tl_xS_y. A phase composition of the layers obtained was confirmed by X-ray photoelectron spectroscopy. The spectra of Tl 4f_(7/2), O 1s and S 2p showed the bond of thallium with sulphur in T1S and T1_2S , but Tl_2SO_4, Tl(OH)_3, S_8 and Tl_2O_3 were also found on the surface of the layers. Five thallium sulphide phases T1S, Tl2S, Tl_2S_2, Tl4_S_3 and Tl_2S_5 have also been identified in the layers by X-ray diffraction. The peaks of the T1S phase predominate in the diffractograms.