Spectroscopic properties of gold nanoparticles by laser irradiation

Abstract

In this work a gold nanoparticles solutions has been irradiated by laser beam.The gold nanoparticles are prepared by using potassium bitarate as a reducing agent and Polyethylene glycol as a dispersion factor. The particles size of prepared solutions between 50-100 nanometers. Colloidal gold nanoparticles are irradiate with laser diode at period 5 and 10 minutes then the comparisons between two solutions with and without irradiation was done. The results are obtained by measuring the absorbance and using a spectrophotometer for the both solutions before and after irradiation. The result shows the differences between the spectrum of nanoparticles at ordinary state and spectrum of nanoparticles irradiated with laser beam. It's clear that the resolution is increase when the time of radiation is increasing. When spectrophotometers testing are done, we can note that there are broadening in the beginning of the spectrum of nanoparticles and increasing when time of exposure of laser beam is increasing.