Dikshita Gupta
Jaypee University of Information Technology, India
Title: Effect of reaction temperature and silver concentration on morphology of palladium nanoparticles
Biography
Biography: Dikshita Gupta
Abstract
In this work, we performed the controlled synthesis of palladium nanoparticles by a procedurally simple chemical reduction method-Polyol method at 80oC, 100oC, and 120oC. Pd2+ was reduced to Pd0 using ethylene glycol as reducing agent and the particle growth was controlled by using PVP (Polyvinylpyrrolidone) as capping agent. We used TEM (Transmission Electron Microscopy) to study the effect of temperature on size and shape of palladium nanoparticles. The average particle sizes were found to be 7.5 nm at 80oC, 9.5 nm at 100oC and 10.5 nm at 120oC. Palladium nanoparticles synthesized at 100oC have better size and shape uniformity. To check the effect of silver on the shape of palladium nanoparticles (prepared at 100oC), a colloidal solution of silver was prepared by the same polyol method at 50oC and was added to the solution where palladium reduction process is taking place. A crystallographic approach concerning the role of silver cations on the shape of palladium nanoparticles have been discussed. The evidence of the formation of bimetallic system is given by the position of absorption peak coming between absorption peak of palladium nanoparticles and colloidal silver in UV spectroscopic studies. The red shift in the UV absorption spectra of silver palladium system with the increase in content of silver ions was observed.