The zinc-precursor solution was injected into the sulphur-precursor solution under magnetic stirring, transferred to a Teflon autoclave with the cotton fabrics, properly sealed and placed in a muffle oven. The procedure was carried out at 160 °C for 120 min, repeated with varying concentration of the precursors, 3.68 and 1.84 mmol. All product materials were washed and dried at the end of the procedure.