Photoacoustic study of Changes in Optical Properties of Colloids with Silver Nanoparticles Produced by Laser Ablation

摘要

Silver nanoparticles were produced by laser ablation of a silver target submerged in 10 ml of bidistilled water. A Nd:YAG laser operating at 1064 nm, 20.4 mJ of pulse energy, 6 ns of pulse duration and 10 Hz of repetition rate was used to realize the synthesis. After the synthesis, changes in optical properties of colloid were studied. To realize the study, the pulsed photoacoustic technique was used. Additionally, UV-Vis spectroscopy, dynamic light scattering and Z potential techniques were used to correlate results. After the synthesis, photoacoustic signals, absorption spectra, and size distributions were obtained at different times. Each absorption spectrum showed a unique peak attributed to spherical silver nanoparticles. It was demonstrated that the root mean square and correlation analysis of photoacoustic signals permit to study changes in optical properties of colloidal nanoparticles.