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Chemija / Chemistry

ISSN 0235-7216
ISSN 2424-4538 (online)

2012 m. Nr. 3

The study of silver sulfide layers formed on the polyamide film surface
Valentina KRYLOVA

Layers of silver sulfide, Ag2S, on the PA film surface were formed by the chemical bath deposition method (CBD). Film samples were exposed in acidified solutions of silver nitrate, AgNO3, and sodium thiosulfate, Na2S2O3. Zeta potential (ζ) measurement was applied for estimating the stability of colloidal particles obtained by the reaction from AgNO3 and excess of Na2S2O3 solutions at pH 2.3 and 20 °C, respectively. Samples prepared as Ag2S gave multiple reflections, all corresponding to monoclinic Ag2S (acanthite). The morphology of polyamide PA films modified by silver sulfide layers was studied by the atomic force microscopy method. The formation of silver sulfide layers proceeded unevenly, in the form of islands, which later grew into agglomerates. The surface of the formed layers was relatively uneven and rather rough. The average height of Ag2S layer increased (~145 – ~1 093 nm) with the increasing exposure time of PA treatment in solutions. The layer roughness varied from ~32 to ~244 nm and with the increasing exposure time in precursor solutions regularly increased and caused changes of the shape distribution function of the surface elements.

Keywords: silver sulfide layer, polyamide, zeta potential, XRD, orphology, AFM

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