Spectroscopic analysis of gold nanoparticle synthesis using plasma liquid interaction technique

Surfactant free AuNPs were prepared via Plasma-Liquid Interaction (PLI) technique, using m-plasma, as a function of time, discharge current and gas flow rate.Atomic oxygen [O] and nitrogen [N] densities were determined to study their effect on the intensities of UV radiation and OH radical, which in turns controls the synthesis of AuNPs.UV radiation, OH radical and atomic densities of [O] and [N] were determined through optical emission spectroscopy from gas phase plasma.The increase in UV radiation intensities and OH radicals with time was observed and results were verified by observing increasing trend in the [O] and [N] atomic densities.We report the role of versatile discharge species generated in PLI, like [O] and [N] atomic densities, in the control synthesis of surfactant free AuNPs.