Laser-Induced Size and Shape Transformation of Silver Colloidal Nanoparticles

Abstract

In this paper studies of the changes of the morphology of silver colloidal nanoparticles under laser irradiation at different fluences and wavelengths have been presented. Silver nanoparticles of size 10-30 nm were prepared in a gelatin stabilized AgNO3 solution under reduction with K-Na-tartrate. They were then exposed to pulsed laser radiation at 532 nm, 400 nm and 266 nm. In addition to the fragmented particles, relatively larger-size (1400-1500 nm) rightangled structures were found to be formed in the solution. The experimental conditions favouring laser-induced transformation of the morphology of nanoparticles have been determined.

Highly reusable nanoporous silver sheet for sensitive SERS detection of pesticides

“…In comparison with conventional nanoparticles/rods/ tubes, 47,48 the NPAg sheet offers a facile structural control with high stability and reproducibility. Since the stability and reproducibility can be translated to a signal uniformity in SERS characterization, spatial scanning was performed through different locations on the NPAg sheet surface to generate the background spectra of the NPAg sheet as shown in Fig.…”

Unusual transient absorption dynamics of silver nanoparticles in solutions of carboxylated amine complexons

“…These changes are associated with the particles' temperature change due to an irradiation, which depends on the properties of the laser excitation (energy density, pulse duration, the time of exposure, etc), and on the parameters of the irradiated system (stabilizer type, reducing agent nature, amount and shape of particles). Calculations show [23] that irreversible changes of the silver 10-100 nm particle shape will occur at an energy density in the range 5-10 mJ cm −2 when the temperature of the particles can exceed the melting point of the material. At an energy density greater than 60 mJ cm −2 the particle size changes due to their evaporation and particle fragmentation must be observed.…”