Electrospraying of gold nanoparticles / Ahmad Ameer Abdul Rasid

Synthesizing of gold nanoparticles were conducted by reversing the order of reagents through citrate reduction method. Monodispersed of gold nanoparticles were hard to be obtained by using classical method likes dripping, continuously and progressively. Therefore, electrospraying technique had been introduced and applied in this research due to its advantages. Dispersion of hydrogen tetrachloroaurate solution into the reaction bath containing reductor trisodium citrate dihydrate solution are conducted using the fore mentioned above technique. Molar ratio of citrate to chloroaurate were changed and their effects on the size, distribution, dispersity and stability of particles were investigated. The colloidal gold particles were characterized by Zeta-Sizer and UV-Visible spectroscopy. The size of gold nanoparticles formed decreases from 11.2 nm to 4.8 nm with increasing in the dispersity of the particles as the molar ratio increases. Electrospraying approach turned out to be an effective method in synthesizing Au nanoparticles as this method produces highly homogenous formation of nanoparticles compared to the other method as well as this approach have the ability to produce very small particles(droplets) with narrow size distribution due to charged droplets which limits the aggregation of the particles.