Synthesis of colloidal nanosilver as active agent of disinfectant using pulse laser ablation

Abstract

Synthesis of colloidal silver nanoparticles has been conducted using pulse laser ablation technique. Compared to chemical technique, pulse laser ablation can be successfully applied to produce silver nanoparticles with high impurity without any reduction chemical agent, thus they are applicable for human-related application such as disinfectant. Experimentally, high purity silver metal was immersed into polyvinylpirrolidone (PVP) liquid. The silver was subsequently bombarded by pulsed Nd:YAG laser. The silver nanoparticles (AgNPs) was successfully produced and dispersed in the PVP liquid. The produced AgNPs have a spherical shape with an averaged diameter of 15.6 nm and its light single Plasmon resonance (LSPR) peak at 402 nm. The colloidal AgNPs were then applied as an antibacterial agent to Escherichia coli and Streptococcus aureus. The result certified that a killing rate of 100% for both bacteria was obtained after AgNPs treatment for 30 s. The produced colloidal silver nanoparticles can be employed as a disinfectant.