Electrosynthesis of zinc sulfide nanoparticles doped with copper and chlorine has been investigated in this study. For the electrosynthesis of ZnS, a constant current pulse of 200 mA cm-2 was applied to zinc nitrate and sodium thiosulfate solution containing 1 M hydrochloric acid in an electrochemical cell. The thin film of zinc sulfide nanoparticles was placed on a graphite electrode. For doping Cl- and Cu+ on ZnS, the modified electrode was placed in copper sulfate solution containing 0.1 M potassium chlorate under a constant potential of -0.9 V for 3 minutes. By changing the concentration of potassium chlorate from 0.1 to 0.01 and 0.0001 M, the amount of doped Cl was variable, therefore; nanoparticles with different luminescence properties were achieved. Based on the X-ray diffraction pattern average crystallite size for nanocomposites is the same and about 34-64 nm. Using scanning electron microscopy imaging it was observed that synthesized nanocomposites have appropriate uniformity. Characterization was performed using XRD and FT-IR methods. The morphology and luminescence properties of these nanoparticles were studied using SEM and UV-Visible. پرونده مقاله

This study is in investigated the antioxidant effects of polypyrrole and grapheme nanocomposite on 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical and Ferric reduction activity potential (FRAP). The electrosynthesis of this nanocomposite on the tip of a graphite pencil by cyclic voltammetry (CV) in the potential range -0.4 to 1.2V at the 5 mL of phosphoric acid (H3PO4), in the presence of potassium chloride (KCl) electrolyte supplements as an inorganic salt and p-Toluene sulfonic acid (pTSA) as an organic salt was performed. Antioxidant capacity was determined using Uv-vis spectroscopy. Also, FT-IR Spectroscopy and scanning electron microscopy (FESEM) were used to study the surface structure and topography of nanocomposite.Polypyrrole-graphene nanocomposite has antioxidant properties and increases the absorption rate at FRAP = λmax596 nm by reducing iron ions and reducing the absorption rate in DPPH = λmax516 nm by the transition of electrons and destroying DPPH free radicals. Also, this nanocomposite in the presence of p-Toluene sulfonic acid has a higher antioxidant capacity than the presence of potassium chloride. پرونده مقاله