Characterization and surface-enhanced Raman spectral probing of silver hydrosols prepared by two-wavelength laser ablation and fragmentation
2003
Abstract
Characterization and surface-enhanced Raman spectral probing of silver hydrosols prepared by two-wavelength laser ablation and fragmentation, preparation of laser-ablated silver hydrosol. A four step Ag foil laser ablation-Ag nanoparticle fragmentation procedure in ultrapure water was carried out both under argon and in air.
Pulses of a high power Nd/YAG laser were used for laser ablation and for the three step Ag hydrosol treatment in the absence of Ag foil in the sequence 1064-532-1064 nm. Transmission electron microscopy and surface plasmon extinction spectra provide evidence of Ag nanoparticle fragmentation in the second and third step of the procedure carried out under argon.