Investigation of the electrical field effect on silver nanoparticles synthesizedusing sodium citrate and pvp stabilizers

The behavior of silver nanoparticles (AgNPs) under applied electric field depends primarily on their stabilizing agent. This research is aimed at investigating the behavior of AgNPs and theirstabilizers under electrochemical (EC) process. Silver nitrate and hydrazine hydrate were used as the sources of silver ion and reducing agent, respectively. In separate experiments, sodium citrate and polyvinylpyrrolidone (PVP) were used as nanoparticle stabilizers. Stability of the particles was studies when electrical current was applied. The efficiency of the EC process was investigated for different of AgNP sols. With sodium citrate for different voltages, after using the electric field for 90 min, the plasmon resonance peak of the sample disappeared, reflecting the removal of the AgNPs in the sol by 99.91%. With PVP, after applying electric field for 10 min, the absorbance peaks disappeared, and removal efficiency of the AgNPs reached 99.98%. Based on these results, it can be recognized that the AgNPs stabilized by citrate, are slightly more stable, whereas AgNPs solutions prepared by PVP showed better results on floc formation and, therefore, agglomerated more easily. The UV/Vis spectroscopy analysis was used for characterization of all samples. Also,the Field Emission Scanning Electron Microscopy (FESEM) was used for floc characterization.

Keywords:

AgNPs , Sodium Citrate , PVP , Stabilizer , Electrochemical Process