This work describes a simple and straightforward processing of core-shell structured nanocomposite fibers, consisting of a metal sulfide shell and a viscose fiber core. The metal sulfide shell forms by the addition of the corresponding metal salt precursor into the sulfuric acid regeneration bath; any further reactants are not needed. A reaction of the dissolved metal cations (Ag, Cu, Sn) with sulfur sources present in the viscose spinning dope leads to the formation of (nano)crystalline metal sulfide particles (CuS, Ag2S, SnS) on the viscose fibers. The metal loading on the fibers and the thickness of the formed shell depends on the type of precursor salt and concentration and can reach up to 10 wt% under the chosen conditions. The formation of metal sulfides exclusively takes place on the fiber surface and some metal sulfides (CuS and Ag2S) unexpectedly come in phase pure configurations. The materials have been characterized by SEM (morphology), XRD (metal sulfide phase) and ICPMS (amount of metal sulfide on fiber).
|Publication status||Published - 31 Mar 2020|
Fields of Expertise
- Advanced Materials Science