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The ablation of a metal target at laser energy densities in the range of 1–10 TW/cm2 leads to the generation of nanoparticles (NP) of the ablated material. This aspect is of particular interest if the immobilization of NPs on three-dimensional (3D) substrates is necessary as for example in sensing applications. In this work the deposition of Au NP by irradiation of a Au bulk target with a sub-picosecond laser beam (500 fs; 248 nm; 10 Hz) on 2D (silica and Si(100)) and 3D substrates (silica nanowire forests) is reported for different number of laser pulses (500, 1000, 1500, 2000, 2500). A uniform coverage of small Au NPs (with a diameter of few nm) on both kinds of substrates has been obtained using a suitable number of laser pulses. The presence of spherical droplets, with a diameter ranging from tens of nm up to few μm was also detected on the substrate surface and their presence can be explained by the weak …
Publication date: 
1 Oct 2017

F Gontad, Anna Paola Caricato, Maura Cesaria, Vincenzo Resta, Antonietta Taurino, Antonio Colombelli, Chiara Leo, A Klini, A Manousaki, A Convertino, Roberto Rella, Maurizio Martino, Alessio Perrone

Biblio References: 
Volume: 418 Pages: 430-436
Applied Surface Science