The mixture of silver nanosquare and silver nanohexagon: green synthesis, characterization and kinetic evolution

Abstract

The kinetic studies of preparation silver nanosquare (AgNS) and silver nanohexagon (AgNH) were made by rapid and green synthesis route using ziziphus spina-christi leaf powder with silver nitrate solution. The growth kinetics of silver nanoparticles as a function of time or pH were investigated. The optimal pH was studied by measuring the absorption maxima at different pH intervals (2-8) after treating the reducing agent with the silver nitrate solution. Moreover, the zeta potential was measured at different pHs for detecting the surface charge of Ag nanoparticles in its colloidal solution. The overall available silver ions after 2-25 min and the optimum Ag ion concentration were measured using inductively coupled plasma- optical emission spectroscopy (ICP-OES) technique. Furthermore, the time-dependent growth of crystalline was studied by measuring the increase in size along with the full width at half maximum (FWHM) that was taken from x-ray diffraction. The changes in the oxidation and reduction potentials of the Ag nanoparticles with time were studied to determine the optimum time. The prepared silver nanostructures at optimum conditions were characterized using electronic spectrum (UV-vis), infrared spectrum (IR), x-ray diffraction studies (XRD), zeta sizer, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy-dispersive x-ray spectroscopy (EDX).