CC BY
21LMI-I-1
On the role of plasma phase during Pulsed Laser Ablation in liquid for nanoparticles production
A. De Giacomo1, V. Motto-Ros2, F. Pelascini3, I. Gornushkin4, M. Dell'Aglio5
1University of Bari, Department of Chemistry, Bari, Italy
2Université Lyon 1, Institut Lumière Matière UMR 5306, Lyon, France
3Cetim Grand Est, Cetim Grand Est, Schiltigheim, France
4BAM Federal Institute for Material Research and Testing, Berlin, Germany
5Consiglio Nazionale delle Recirche-CNR, Instiuto di Nanotecnologie- CNR-NANOTEC, Bari,
Italy
In this paper experimental temperature and density maps of the laser induced plasma in water during Pulsed Laser ablation in Liquid (PLAL) for the production of metallic nanoparticles (NPs) has been determined. A detection system based on the simultaneous acquisition of two emission images at 515 and 410 nm has been constructed and the obtained images have been processed simultaneously by imaging software. The results of the data analysis show a variation of the temperature between 4000 and 7000 K over the plasma volume. Moreover, by the study of the temperature distribution and of the number densities along the plasma expansion axis it is possible to observe the condensation zone of the plasma where NPs can be formed.
Finally, the time associated to the electron processes is estimated and the plasma charging effect on NPs is demonstrated. The set of observations retrieved from these experiments allows a new insight about the nature of LIP in water during PLAL for the production of NPs and about the mechanism of NP formation as well as the releasing of NPs from the bubble to the solution.
