Paper 14093-49
Paper 14093-49
Dynamic control of gold nanoparticle chains via laser irradiation (Invited Paper)
15 April 2026 • 13:30 - 14:00 CEST | Curie A (Niveau/Level 1)
Abstract
Gold nanoparticles display size-, shape-, and aggregation-dependent plasmonic properties. Pulsed Laser Ablation in Liquid (PLAL) enables chemical-free synthesis of small, stable Au NPs, while halides such as bromide induce controlled aggregation into linear chains. The aggregation kinetics depend on halide type, concentration, temperature, and particle size, as shown by UV–Vis spectroscopy and electron microscopy.
Pulsed laser re-irradiation dynamically modifies these assemblies: low fluences gradually disrupt chains, whereas higher fluences induce simultaneous chain disruption and nanoparticle fragmentation, especially under resonant excitation at the transverse LSPR (∼532 nm). Ultrafast pump-probe spectroscopy reveals that electronic relaxation times increase with particle size and clustering, linking plasmonic coupling to energy dissipation.
This work demonstrates dynamic, laser-enabled control of Au NP chains, integrating synthesis, assembly, ultrafast dynamics, and optical reshaping for applications in photonics and advanced manufacturing.
Presenter
Giuseppe Compagnini
Univ. degli Studi di Catania (Italy)
Giuseppe Compagnini is actually full professor of Physical Chemistry at the University of Catania.
He is author of more than 200 papers with around 10000 citations on international peer reviewed journals devoted to the fields of ion-matter interaction, carbon based nanomaterials, plasmonics and optics and has obtained relevant awards from scientific societies such as the Italian Physical Society (SIF) and the Materials Research Society (MRS) over the past 25 years. Actually, he is editor of the journal “Surfaces and Interfaces” (Elsevier).
In his career, he has explored several fields in materials science and spectroscopy and has gained experience on surface science, nanoscience and the related applications to nanotechnology. His research group is actually involved in the fabrication and modification of nanostructured materials by using laser beams with applications to catalysis and sensing and to the development of novel functional materials for aerospace applications.