چكيده به لاتين
In this project, Cu2ZnSnS4 (CZTS) quaternary chalcogenide nanoparticles were synthesized by using facile and rapid microwave method in solid state. Thiourea was used as sulfur source. In addition, this reactant plays a role as fuel and driving agent accompanied by H2O and nitrate unites to drive the reaction towards the formation of CZTS nanoparticles. in the formation of product, the variation of microwave irradiation time and the use of other sulfur sources such as thioacetamide, thiocemicarbazide and sulfur powder were studied. The structure, morphology and optical properties of the prepared samples were characterised using XRD, Raman, EXD, SEM, TEM and UV-Vis techniques. The results indicated that use of thiourea and/or thiocemicarbazide accompanied by metal salts of copper (I) chloride, zinc nitrate tetra hydrate and tin (IV) chloride dihydrate leads to form single phase of CZTS nanoparticles with kesterite phase and average particle size of 38 nm. Band gap of product was estimated at about 1.78 eV by extrapolation of (αhν)2 vs. hν. Electrochemical properties of product were studied via performing electrochemical tests of cyclic voltammetry, impedance in resistance determination, linear scanning potential and chronoamprometry in different acidic, neutral and alkaline conditions. The tests results showed good conductivity current in CZTS product. In addition, CZTS nanoaprticles were composed with graphene oxide and reduced graphene oxide and their electrochemical properties were investigated. The electrochemical tests revealed the increase of redox peaks in the composited samples of GO/CZTS and rGO/CZTS. Meanwhile, it was observed the increase in conductivity and the improvement of catalytic effect of these composites compared to CZTS in hydrogen production.
