Dr Patrizio Antici (Institut Lumiere Extreme)
We present a method for the synthesis of micro-crystals and micro-structured surfaces using laser-accelerated protons. In this method, a solid surface material having a low melting temperature is irradiated with laser-generated protons for only a few tens of ps, provoking in the ablation process thermodynamic conditions that are between the boiling and the critical point. The intense and very quick proton energy deposition (sub-ns) induces an explosive boiling and produces microcrystals that aggregate in a plasma plume composed by ions and atoms detached from the laser-irradiated surface. The synthesized particles in the plasma plume then aggregate on a neighboring, non-irradiated, cold solid secondary target surface. We experimentally verify the synthesizing methods by depositing low-melting-material microcrystals - such as gold - onto nearby silver surfaces and modeling the proton/matter interaction via a montecarlo code, confirming that we are in the above described thermodynamic conditions. Morphological and crystallinity measurements indicate the formation of gold octahedral crystals with dimensions of 1.2 μm (standard deviation < 5%), uniformly distributed on an entire silver surface (5 mm x 1 cm). This laser-accelerated particle based synthesis method paves the way for the development of new material synthesis.
Prof. Marianna Barberio (INRS) Dr Patrizio Antici (Institut Lumiere Extreme)
Antonia Morabito (ROMA1) Ceferino Obcemea (Memorial Sloan Kettering Cancer Center) Massimiliano Sciscio' (ROMA1) Mr Simon Vallieres (INRS) Mrs Simona Veltri (Università della Calabria - DiBest)